View source for Astronomy:Andromeda (constellation)

{{Short description|Constellation in the northern celestial hemisphere}}
{{Infobox constellation
| name = Andromeda
| abbreviation = And{{sfn|Russell|1922|p=469}}
| genitive = Andromedae
| pronounce =
  {{plainlist |
* {{IPAc-en|æ|n|ˈ|d|r|ɒ|m|ᵻ|d|ə}}
* genitive {{IPAc-en|æ|n|ˈ|d|r|ɒ|m|ᵻ|d|iː}}
  }}
| symbolism = Andromeda, <br /> the Chained Woman{{sfn|Allen|1899|pp=32–33}}
| RA = {{RA|23|25|48.6945}}–{{RA|02|39|32.5149}}{{sfn|IAU, ''The Constellations'', Andromeda}}
| dec = {{dec|53.1870041}}–{{dec|21.6766376}}{{sfn|IAU, ''The Constellations'', Andromeda}}
| family = Perseus
| areatotal = 722{{sfn|Ridpath, ''Constellations''}}
| arearank = 19th
| numbermainstars = 16
| numberbfstars = 65
| numberstarsplanets = 12
| numberbrightstars = 3
| numbernearbystars = 3
| brighteststarname = [[Astronomy:Alpheratz|Alpheratz]] (α And)
| starmagnitude = 2.07
| neareststarname = [[Astronomy:Ross 248|Ross 248]]{{sfn|RECONS, ''The 100 Nearest Star Systems''}}
| stardistancely = 10.3
| stardistancepc = 3.16
| numbermessierobjects = 3{{sfn|Bakich|1995|p=54}}
| meteorshowers = [[Astronomy:Andromedids|Andromedids]] (Bielids)
| bordering =
  {{plainlist |
* [[Astronomy:Perseus (constellation)|Perseus]]
* [[Astronomy:Cassiopeia (constellation)|Cassiopeia]]
* [[Astronomy:Lacerta|Lacerta]]
* [[Astronomy:Pegasus (constellation)|Pegasus]]
* [[Astronomy:Pisces (constellation)|Pisces]]
* [[Astronomy:Triangulum|Triangulum]]{{sfn|Bakich|1995|p=26}}
  }}
| latmax = [[Earth:North Pole|90]]
| latmin = 40
| month = November
| notes =
}}
'''Andromeda''' is one of the 48 [[Astronomy:Constellation|constellation]]s listed by the 2nd-century [[Astronomy:Ancient Greek astronomy|Greco-Roman]] astronomer [[Biography:Ptolemy|Ptolemy]],  and one of the [[Astronomy:88 modern constellations|88 modern constellations]]. Located in the [[Astronomy:Northern celestial hemisphere|northern celestial hemisphere]], it is named for Andromeda, daughter of Cassiopeia, in the [[Religion:Greek mythology|Greek myth]], who was chained to a rock to be eaten by the sea monster Cetus. Andromeda is most prominent during autumn evenings in the [[Earth:Northern Hemisphere|Northern Hemisphere]], along with several other constellations named for characters in the [[Social:Perseus|Perseus]] myth. Because of its northern [[Declination|declination]], Andromeda is visible only north of 40° south latitude; for observers farther south, it lies below the horizon. It is one of the largest constellations, with an area of 722 square degrees. This is over 1,400 times the size of the [[Astronomy:Full moon|full moon]], 55% of the size of the largest constellation, [[Astronomy:Hydra (constellation)|Hydra]], and over 10 times the size of the smallest constellation, [[Astronomy:Crux|Crux]].

Its brightest star, [[Astronomy:Alpha Andromedae|Alpha Andromedae]], is a [[Astronomy:Binary star|binary star]] that has also been counted as a part of [[Astronomy:Pegasus (constellation)|Pegasus]], while [[Astronomy:Gamma Andromedae|Gamma Andromedae]] is a colorful binary and a popular target for amateur astronomers. Only marginally dimmer than Alpha, [[Astronomy:Beta Andromedae|Beta Andromedae]] is a [[Astronomy:Red giant|red giant]], its color visible to the naked eye. The constellation's most obvious deep-sky object is the naked-eye [[Astronomy:Andromeda Galaxy|Andromeda Galaxy]] (M31, also called the Great Galaxy of Andromeda), the closest spiral galaxy to the Milky Way and one of the brightest [[Astronomy:Messier object|Messier object]]s. Several fainter galaxies, including M31's companions [[Astronomy:Messier 110|M110]] and [[Astronomy:Messier 32|M32]], as well as the more distant [[Astronomy:NGC 891|NGC 891]], lie within Andromeda. The Blue Snowball Nebula, a [[Astronomy:Planetary nebula|planetary nebula]], is visible in a telescope as a blue circular object.

In [[Astronomy:Chinese astronomy|Chinese astronomy]], the stars that make up Andromeda were members of four different constellations that had astrological and mythological significance; a constellation related to Andromeda also exists in Hindu mythology. Andromeda is the location of the [[Astronomy:Radiant (meteor shower)|radiant]] for the [[Astronomy:Andromedids|Andromedids]], a weak [[Astronomy:Meteor shower|meteor shower]] that occurs in November.

== History and mythology ==
[[File:Andromeda Hevelius.jpg|thumb|left|[[Biography:Johannes Hevelius|Johannes Hevelius]]'s depiction of Andromeda, from the 1690 edition of his ''Uranographia''. As was conventional for celestial atlases of the time, the constellation is a mirror image of modern maps as it was drawn from a perspective outside the [[Celestial sphere|celestial sphere]].]]
[[File:Sidney Hall - Urania's Mirror - Gloria Frederici, Andromeda, and Triangula.jpg|thumb|left|Andromeda as depicted in ''[[Astronomy:Urania's Mirror|Urania's Mirror]]'', a set of constellation cards published in London c.&nbsp;1825, showing the constellation from the inside of the celestial sphere]]
[[File:F19.v. Andromeda NLW MS 735C.png|thumb|Andromeda depicted in an early scientific manuscript, c.1000]]
The uranography of Andromeda has its roots most firmly in the Greek tradition, though a female figure in Andromeda's location had appeared earlier in [[Astronomy:Babylonian astronomy|Babylonian astronomy]]. The stars that make up [[Astronomy:Pisces (constellation)|Pisces]] and the middle portion of modern Andromeda formed a constellation representing a fertility goddess, sometimes named as Anunitum or the Lady of the Heavens.{{sfn|Rogers, ''Mediterranean Traditions''|1998}}

Andromeda is known as "the Chained Lady" or "the Chained Woman" in English. It was known as ''Mulier Catenata'' ("chained woman") in [[Social:Latin|Latin]] and ''al-Mar'at al Musalsalah'' in [[Social:Arabic|Arabic]].{{sfn|Allen|1899|pp=32–33}} It has also been called ''Persea'' ("Perseus's wife") or ''Cepheis'' ("Cepheus's daughter"),{{sfn|Allen|1899|pp=32–33}}{{sfn|Olcott|2004|pp=22–23}} all names that refer to Andromeda's role in the Greco-Roman myth of Perseus, in which Cassiopeia, the queen of Ethiopia, bragged that her daughter was more beautiful than the [[Unsolved:Nereid|Nereid]]s, sea nymphs blessed with incredible beauty.{{sfn|Moore|Tirion|1997|pp=116–117}} Offended at her remark, the nymphs petitioned [[Religion:Poseidon|Poseidon]] to punish Cassiopeia for her insolence, which he did by commanding the sea monster [[Astronomy:Cetus|Cetus]] to attack Ethiopia.{{sfn|Moore|Tirion|1997|pp=116–117}} Andromeda's panicked father, Cepheus, was told by the Oracle of Ammon that the only way to save his kingdom was to sacrifice his daughter to Cetus.{{sfn|Thompson|Thompson|2007|pp=66–73}}{{sfn|Ridpath, ''Star Tales'' Andromeda}}<!-- The previous few sentences are covered by Thompson and Ridpath, including the sentences also cited to Moore. --> She was chained to a rock by the sea but was saved by the hero [[Social:Perseus|Perseus]], who in one version of the story used the head of [[Unsolved:Medusa|Medusa]] to turn the monster into stone;{{sfn|Pasachoff|2000|p=132}} in another version, by the Roman poet Ovid in his Metamorphoses, Perseus slew the monster with his diamond sword.{{sfn|Ridpath, ''Star Tales'' Andromeda}} Perseus and Andromeda then married; the myth recounts that the couple had nine children together&nbsp;– seven sons and two daughters&nbsp;– and founded [[History:Mycenae|Mycenae]] and its Persideae dynasty. After Andromeda's death Athena placed her in the sky as a constellation, to honour her. Three of the neighbouring constellations ([[Astronomy:Perseus (constellation)|Perseus]], [[Astronomy:Cassiopeia (constellation)|Cassiopeia]] and [[Astronomy:Cepheus (constellation)|Cepheus]]) represent characters in the Perseus myth, while Cetus retreats to beyond [[Astronomy:Pisces (constellation)|Pisces]].{{sfn|Thompson|Thompson|2007|pp=66–73}} It is connected with the constellation Pegasus.

Andromeda was one of the original 48 [[Astronomy:Constellation|constellation]]s formulated by [[Biography:Ptolemy|Ptolemy]] in his 2nd-century [[Astronomy:Almagest|Almagest]], in which it was defined as a specific pattern of stars. She is typically depicted with α Andromedae as her head, ο and λ Andromedae as her chains, and δ, π, μ, β, and γ her body and legs. However, there is no universal depiction of Andromeda and the stars used to represent her body, head, and chains.{{sfn|Staal|1988|pp=7–14, 17}} Arab astronomers were aware of Ptolemy's constellations, but they included a second constellation representing a fish overlapping Andromeda's body; the nose of this fish was marked by a hazy patch that ‍we ‍now ‍know ‍as ‍the ‍[[Astronomy:Andromeda Galaxy|Andromeda Galaxy]], ‍M31.<ref>{{cite web |url=http://www.ianridpath.com/startales/andromeda-alsufi.html|title=The Andromeda Galaxy and the Double Cluster in al-Sufi's Book of the Fixed Stars|publisher=Ian Ridpath's Star Tales |access-date=21 November 2022}}</ref> Several stars from Andromeda and most of the stars in [[Astronomy:Lacerta|Lacerta]] were combined in 1787 by German astronomer Johann Bode to form [[Astronomy:Honores Friderici|Honores Friderici]] (also called Friedrichs Ehre). It was designed to honour [[History:Frederick the Great|King Frederick II of Prussia]], but quickly fell into disuse.{{sfn|Bakich|1995|p=43}} Since the time of Ptolemy, Andromeda has remained a constellation and is officially recognized by the [[Organization:International Astronomical Union|International Astronomical Union]]. Like all those that date back to a pattern known to Ptolemy, it is attributed to a wider zone and thus many surrounding stars.{{sfn|Bakich|1995|p=11}}{{sfn|Pasachoff|2000|pp=128–129}} In 1922, the IAU defined its recommended three-letter abbreviation, "And".{{sfn|Russell|1922|pp=469–471}} The official boundaries of Andromeda were defined in 1930 by Belgian astronomer Eugène Delporte as a polygon of 36 segments. Its [[Right ascension|right ascension]] is between 22<sup>h</sup> 57.5<sup>m</sup> and 2<sup>h</sup> 39.3<sup>m</sup> and its [[Declination|declination]] is between 53.19° and 21.68° in the [[Astronomy:Equatorial coordinate system|equatorial coordinate system]].{{sfn|IAU, ''The Constellations'', Andromeda}}

=== In non-Western astronomy ===
[[File:AndromedaCC.jpg|thumbnail|left|Photo of the constellation Andromeda, as it appears to the naked eye. Lines have been added for clarity.]]

In traditional [[Astronomy:Chinese astronomy|Chinese astronomy]], nine stars from Andromeda (including Beta Andromedae, Mu Andromedae, and Nu Andromedae), along with seven stars from Pisces, formed an elliptical constellation called "[[Astronomy:Legs (Chinese constellation)|Legs]]" (奎宿). This constellation either represented the foot of a walking person or a wild boar.{{sfn|Ridpath, ''Star Tales'' Andromeda}} [[Astronomy:Gamma Andromedae|Gamma Andromedae]] and its neighbours were called "[[Astronomy:Teen Ta Tseang Keun|Teen Ta Tseang Keun]]" (天大将军, heaven's great general), representing honour in astrology and a great general in mythology.{{sfn|Olcott|2004|pp=22–23}}{{sfn|Ridpath, ''Star Tales'' Andromeda}} [[Astronomy:Alpha Andromedae|Alpha Andromedae]] and [[Astronomy:Gamma Pegasi|Gamma Pegasi]] together made "[[Astronomy:Wall (Chinese constellation)|Wall]]" (壁宿), representing the eastern wall of the imperial palace and/or the emperor's personal library. For the Chinese, the northern swath of Andromeda formed a stable for changing horses ({{transl|zh|tianjiu}}, 天厩, stable on sky) and the far western part, along with most of [[Astronomy:Lacerta|Lacerta]], became Tengshe, a flying snake.{{sfn|Ridpath, ''Star Tales'' Andromeda}}

An Arab constellation called "al-Hut" (the fish) was composed of several stars in Andromeda, M31, and several stars in Pisces. [[Astronomy:Nu Andromedae|ν And]], [[Astronomy:Mu Andromedae|μ And]], [[Astronomy:Beta Andromedae|β And]], [[Astronomy:Eta Andromedae|η And]], [[Astronomy:Zeta Andromedae|ζ And]], [[Astronomy:Epsilon Andromedae|ε And]], [[Astronomy:Delta Andromedae|δ And]], [[Astronomy:Pi Andromedae|π And]], and [[Astronomy:32 Andromedae|32 And]] were all included from Andromeda; [[Astronomy:Nu Piscium|ν Psc]], [[Astronomy:Phi Piscium|φ Psc]], [[Astronomy:Chi Piscium|χ Psc]], and [[Astronomy:Psi Piscium|ψ Psc]] were included from Pisces.{{sfn|Davis|1944}}

As per Hindu astronomy, Andromeda is known as Devyani Constellation while Cassiopeia is Sharmishta Constellation. Devyani and Sharmishta are wives of King Yayati (Perseus Constellation) who is the earliest patriarch of the Kuru and Yadu Clans that are mentioned frequently in epic Mahabharat. There is an interesting story of these three characters mentioned in Mahabharat. Devyani is the daughter of Guru Shukracharya while Shar.{{CN|date=January 2023}}

Hindu legends surrounding Andromeda are similar to the Greek myths. Ancient Sanskrit texts depict Antarmada chained to a rock, as in the Greek myth. Scholars believe that the Hindu and Greek astrological myths were closely linked; one piece of evidence cited is the similarity between the names "Antarmada" and "Andromeda".{{sfn|Olcott|2004|pp=22–23}}

Andromeda is also associated with the [[Place:Mesopotamia|Mesopotamia]]n creation story of [[Unsolved:Tiamat|Tiamat]], the goddess of Chaos. She bore many demons for her husband, Apsu, but eventually decided to destroy them in a war that ended when [[Religion:Marduk|Marduk]] killed her. He used her body to create the constellations as markers of time for humans.{{sfn|Olcott|2004|pp=22–23}}{{sfn|Staal|1988|pp=7–14, 17}}

In the Marshall Islands, Andromeda, Cassiopeia, Triangulum, and Aries are incorporated into a constellation representing a [[Biology:Porpoise|porpoise]]. Andromeda's bright stars are mostly in the body of the porpoise; Cassiopeia represents its tail and Aries its head.{{sfn|Staal|1988|pp=7–14, 17}} In the Tuamotu islands, Alpha Andromedae was called ''Takurua-e-te-tuki-hanga-ruki'', meaning "Star of the wearisome toil",{{sfn|Makemson|1941|p=255}} and Beta Andromedae was called ''Piringa-o-Tautu''.{{sfn|Makemson|1941|p=279}}

== Features ==

=== Stars ===
{{Further|Astronomy:List of stars in Andromeda}}
[[File:Andromeda annotated.png|thumb|400px|Andromeda as it appears in the night sky, with the superimposed figure.]]
* [[Astronomy:Alpha Andromedae|α And]] (Alpheratz, Sirrah) is the brightest [[Astronomy:Star|star]] in this constellation. It is an [[Astronomy:Ap and Bp stars|A0p class]]{{sfn|Moore|Tirion|1997|pp=116–117}} binary star with an overall [[Astronomy:Apparent visual magnitude|apparent visual magnitude]] of 2.1 and a [[Astronomy:Luminosity|luminosity]] of {{Solar luminosity|link=y|96}}.{{sfn|Moore|2000|pp=328–330}} It is 97 [[Astronomy:Light-year|light-year]]s from Earth.{{sfn|SIMBAD Alpha And}} It represents Andromeda's head in Western mythology, however, the star's traditional [[Social:Arabic|Arabic]] names&nbsp;– Alpheratz and Sirrah, from the phrase ''surrat al-faras''&nbsp;– {{sfn|Davis|1944}} sometimes translated as "navel of the steed".{{sfn|Ridpath, ''Star Tales'' Andromeda}}{{sfn|Ridpath|Tirion|2009|pp=61–62}}{{sfn|Odeh|Kunitzsch|1998}} The Arabic names are a reference to the fact that α And forms an [[Astronomy:Asterism|asterism]] known as the "Great Square of Pegasus" with 3 stars in [[Astronomy:Pegasus (constellation)|Pegasus]]: [[Astronomy:Alpha Pegasi|α]], [[Astronomy:Beta Pegasi|β]], and [[Astronomy:Gamma Pegasi|γ Peg]]. As such, the star was formerly considered to belong to both Andromeda and Pegasus, and was co-designated as "Delta Pegasi (δ Peg)", although this name is no longer formally used.{{sfn|Moore|Tirion|1997|pp=116–117}}{{sfn|Ridpath, ''Star Tales'' Andromeda}}{{sfn|Moore|2000|pp=328–330}}
* [[Astronomy:Beta Andromedae|β And]] (Mirach) is a red-hued giant star of type M0{{sfn|Moore|Tirion|1997|pp=116–117}}{{sfn|SIMBAD Mirach}} located in an asterism known as the "girdle". It is 198 light-years away,{{sfn|SIMBAD Mirach}} has a magnitude of 2.06,{{sfn|Ridpath|2001|pp=72–74}} and a luminosity of {{Solar luminosity|115}} with a planet discovered orbiting this star ([[Astronomy:Beta Andromedae b|b]]).{{sfn|Moore|2000|pp=328–330}} Its name comes from the Arabic phrase ''al-Maraqq'' meaning "the loins" or "the loincloth",{{sfn|Odeh|Kunitzsch|1998}} a phrase translated from Ptolemy's writing. However, β And was mostly considered by the Arabs to be a part of al-Hut, a constellation representing a larger fish than Pisces at Andromeda's feet.{{sfn|Davis|1944}}
* [[Astronomy:Gamma Andromedae|γ And]] (Almach) is an orange-hued bright giant star of [[Astronomy:K-type star|type K3]]{{sfn|Moore|Tirion|1997|pp=116–117}} found at the southern tip of the constellation with an overall magnitude of 2.14.{{sfn|Moore|2000|pp=328–330}} Almach is a multiple star with a yellow primary of magnitude 2.3 and a blue-green secondary of magnitude 5, separated by 9.7 [[Arcsecond|arcsecond]]s.{{sfn|Thompson|Thompson|2007|pp=66–73}}{{sfn|Ridpath, ''Star Tales'' Andromeda}}{{sfn|Ridpath|Tirion|2009|pp=61–62}} British astronomer William Herschel said of the star: "[the] striking difference in the colour of the 2 stars, suggests the idea of a sun and its planet, to which the contrast of their unequal size contributes not a little."{{sfn|French|2006}} The secondary, described by Herschel as a "fine light sky-blue, inclining to green",{{sfn|French|2006}} is itself a double star, with a secondary of magnitude 6.3{{sfn|Thompson|Thompson|2007|pp=66–73}} and a period of 61 years.{{sfn|Moore|2000|pp=328–330}} The system is 358 light-years away.{{sfn|SIMBAD Gamma1 Andromedae}} Almach was named for the Arabic phrase ''ʿAnaq al-Ard'', which means "the earth-kid", an obtuse reference to an animal that aids a lion in finding prey.{{sfn|Davis|1944}}{{sfn|Odeh|Kunitzsch|1998}}
* [[Astronomy:Delta Andromedae|δ And]] is an orange-hued giant star of [[Astronomy:K-type star|type K3]]{{sfn|Moore|Tirion|1997|pp=116–117}} orange giant of magnitude 3.3.{{sfn|Ridpath|2001|pp=72–74}} It is 105 light-years from Earth.{{sfn|SIMBAD Delta Andromedae}}
* [[Astronomy:Iota Andromedae|ι And]], [[Astronomy:Kappa Andromedae|κ]], [[Astronomy:Lambda Andromedae|λ]], [[Astronomy:Omicron Andromedae|ο]], and [[Astronomy:Psi Andromedae|ψ And]] form an asterism known as "Frederick's Glory", a name derived from a [[Astronomy:Former constellations|former constellation]] (Frederici Honores).{{sfn|Bakich|1995|p=43}} ι And is a blue-white hued main-sequence star of type B8, 502 light-years from Earth;{{sfn|SIMBAD Iota And}} κ And is a white-hued main-sequence star of type B9 IVn, 168 light-years from Earth;{{sfn|SIMBAD Kappa Andromedae}} λ And is a yellow-hued giant star of type G8, 86 light-years from Earth;{{sfn|SIMBAD Lambda Andromedae}} ο And is a blue-white hued giant star of type B6, 679 light-years from Earth;{{sfn|SIMBAD Omicron Andromedae}} and ψ And is a blue-white hued main-sequence star of type B7, 988 light-years from Earth.{{sfn|SIMBAD Psi Andromedae}}
* [[Astronomy:Mu Andromedae|μ And]] is a white-hued main-sequence star of type A5 and magnitude 3.9.{{sfn|Ridpath|2001|pp=72–74}} It is 130 light-years away.{{sfn|SIMBAD 37 Andromedae}}
* [[Astronomy:Upsilon Andromedae|υ And]] (Titawin)<ref name="IAU-LSN"/> is a magnitude 4.1{{sfn|Ridpath|2001|pp=72–74}} binary system that consists of one F-type dwarf and an M-type dwarf. The primary star has a [[Astronomy:Planetary system|planetary system]] with 4 confirmed planets,<ref name=Ligi2012>{{cite journal |display-authors=1 | first1=R. | last1=Ligi | first2=D. | last2=Mourard | first3=A. M. | last3=Lagrange | first4=K. | last4=Perraut | first5=T. | last5=Boyajian | first6=Ph. | last6=Bério | first7=N. | last7=Nardetto | first8=I. | last8=Tallon-Bosc | first9=H. | last9=McAlister | first10=T. | last10=ten Brummelaar | first11=S. | last11=Ridgway | first12=J. | last12=Sturmann | first13=L. | last13=Sturmann | first14=N. | last14=Turner | first15=C. | last15=Farrington | first16=P. J. | last16=Goldfinger |title=A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, υ Andromedae and 42 Draconis |journal=Astronomy & Astrophysics |volume=545 |pages=A5 | date=2012 |doi=10.1051/0004-6361/201219467 |bibcode=2012A&A...545A...5L |arxiv = 1208.3895 | s2cid=10934982 }}</ref> 0.96 times, 14.57 times, 10.19 times and 1.06 the mass of [[Astronomy:Jupiter|Jupiter]].{{sfn|''ExoPlanet'' ups And}} The system is 44 light-years from Earth.{{sfn|SIMBAD Ups And}}
* [[Astronomy:Xi Andromedae|ξ And]] (Adhil) is a binary star 217 light-years away. The primary is an orange-hued giant star of type K0.{{sfn|SIMBAD Xi Andromedae}}
* [[Astronomy:Pi Andromedae|π And]] is a blue-white hued binary star of magnitude 4.3{{sfn|Ridpath|2001|pp=72–74}} that is 598 light-years away. The primary is a main-sequence star of type B5.{{sfn|SIMBAD 29 And}} Its companion star is of magnitude 8.9.{{sfn|Ridpath|2001|pp=72–74}}
* [[Astronomy:51 Andromedae|51 And]] (Nembus<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=30 July 2018}}</ref>) was assigned by Johann Bayer to Perseus, where he designated it "Upsilon Persei (υ Per)", but it was moved to Andromeda by the International Astronomical Union.{{sfn|Wagman|2003|p=240}} It is 177 light-years from Earth and is an orange-hued giant star of type K3.{{sfn|SIMBAD 51 And}}
* 54 And was a former designation for [[Astronomy:Phi Persei|φ Per]].{{sfn|Ridpath, ''Star Tales'' Andromeda}}{{sfn|Wagman|2003|p=240}}
* [[Astronomy:56 Andromedae|56 And]] is an optical binary star. The primary is a yellow-hued giant star of type K0 with an apparent magnitude of 5.7{{sfn|Ridpath|2001|pp=72–74}} that is 316 light-years away.{{sfn|SIMBAD 56 And}} The secondary is an orange-hued giant star of type K0 and magnitude 5.9 that is 990 light-years from Earth.{{sfn|Ridpath|2001|pp=72–74}}
* [[Astronomy:R Andromedae|R And]] is a [[Astronomy:Mira variable|Mira-type variable star]] with a period of 409 days. Its maximum magnitude is 5.8 and its minimum magnitude is 14.8,{{sfn|Moore|Tirion|1997|pp=116–117}} and it is at a distance of 1,250 light-years.{{sfn|SIMBAD R And}} There are 6 other Mira variables in Andromeda.{{sfn|Moore|2000|pp=328–330}}
* [[Astronomy:Z Andromedae|Z And]] is the M-type prototype for its class of variable stars. It ranges in magnitude from a minimum of 12.4 to a maximum of 8.{{sfn|Moore|2000|pp=328–330}} It is 2,720 light-years away.{{sfn|SIMBAD Z And}}
* [[Astronomy:Ross 248|Ross 248]] (HH Andromedae)  is the ninth-closest star to Earth at a distance of 10.3 light-years.{{sfn|RECONS, ''The 100 Nearest Star Systems''}} It is a red-hued main-sequence BY Draconis variable star of type M6.{{sfn|SIMBAD HH And}}
* [[Astronomy:14 Andromedae|14 And]] (Veritate<ref name="IAU-LSN"/>) is a yellow-hued giant star of type G8 that is 251 light-years away.{{sfn|SIMBAD 14 And}} It has a mass of {{Solar mass|link=y|2.2}} and a radius of {{Solar radius|link=y|11}}. It has one planet, [[Astronomy:14 Andromedae b|14 Andromedae b]], discovered in 2008. It orbits at a distance of 0.83 astronomical units from its parent star every 186 days and has a mass of {{Jupiter mass|link=y|4.3}}.{{sfn|''ExoPlanet'' Planet 14 And b}}

[[File:Andromeda H-R.png|alt=A Hertzsprung-Russel diagram for stars above 4th magnitude in the Andromeda constellation (axes not labelled).|thumb|250x250px|A [[Hertzsprung–Russell diagram|Hertzsprung–Russell diagram]] for stars brighter than 4th magnitude in the constellation Andromeda (axes not labelled).]]
Of the stars brighter than 4th [[Astronomy:Apparent magnitude|magnitude]] (and those with measured [[Astronomy:Luminosity|luminosity]]), Andromeda has a relatively even distribution of [[Astronomy:Stellar evolution|evolved]] and [[Astronomy:Main sequence|main-sequence]] stars.

=== Deep-sky objects ===
[[File:M31bobo.jpg|thumb|250px|right|M31, the Great Galaxy of Andromeda.]]

Andromeda's borders contain many visible distant galaxies.{{sfn|Thompson|Thompson|2007|pp=66–73}} The most famous [[Astronomy:Deep-sky object|deep-sky object]] in Andromeda is the [[Spiral galaxy|spiral galaxy]] cataloged as Messier 31 (M31) or NGC 224 but known colloquially as the [[Astronomy:Andromeda Galaxy|Andromeda Galaxy]]  for the constellation.{{sfn|Pasachoff|2000|p=244}} M31 is one of the most distant objects visible to the naked eye, 2.2&nbsp;million light-years from Earth (estimates range up to 2.5 million light-years).{{sfn|Wilkins|Dunn|2006|pp=348, 366}}  It is seen under a dark, transparent sky as a hazy patch in the north of the constellation.{{sfn|Wilkins|Dunn|2006|pp=348, 366}} M31 is the largest neighboring galaxy to the Milky Way and the largest member of the [[Astronomy:Local Group|Local Group]] of galaxies.{{sfn|Pasachoff|2000|p=244}}{{sfn|Wilkins|Dunn|2006|pp=348, 366}} In absolute terms, M31 is approximately 200,000 light-years in diameter, twice the size of the Milky Way.{{sfn|Wilkins|Dunn|2006|pp=348, 366}} It is an enormous&nbsp;– 192.4 by 62.2 arcminutes in apparent size{{sfn|Thompson|Thompson|2007|pp=66–73}}&nbsp;– [[Astronomy:Barred spiral galaxy|barred spiral galaxy]] similar in form to the Milky Way and at an approximate magnitude of 3.5, is one of the brightest deep-sky objects in the northern sky.{{sfn|Bakich|1995|p=51}} Despite being visible to the naked eye, the "little cloud" near Andromeda's figure was not recorded until AD 964, when the Arab astronomer al-Sufi wrote his ''[[Astronomy:Book of Fixed Stars|Book of Fixed Stars]]''.{{sfn|Ridpath, ''Star Tales'' Andromeda}}{{sfn|Higgins|2002}} M31 was first observed telescopically shortly after its invention, by Simon Marius in 1612.{{sfn|Rao|2011}}

The future of the Andromeda and Milky Way galaxies may be interlinked: in about five billion years, the two could potentially begin an [[Astronomy:Andromeda–Milky Way collision|Andromeda–Milky Way collision]] that would spark extensive new star formation.{{sfn|Wilkins|Dunn|2006|pp=348, 366}}

[[File:Andromeda Galaxy M31 - Heic1502a 10k.jpg|thumbnail|250px|left|Sharp view of the Andromeda Galaxy<ref>{{cite web|title=Sharpest ever view of the Andromeda Galaxy|url=http://www.spacetelescope.org/images/heic1502a/|website=www.spacetelescope.org|publisher=ESA/Hubble|access-date=14 January 2015}}</ref>]]

American astronomer [[Biography:Edwin Hubble|Edwin Hubble]] included M31 (then known as the Andromeda Nebula) in his groundbreaking 1923 research on galaxies.{{sfn|Higgins|2002}} Using the 100-inch Hooker Telescope at Mount Wilson Observatory in California, he observed [[Astronomy:Cepheid variable|Cepheid variable]] stars in M31 during a search for [[Astronomy:Nova|nova]]e, allowing him to determine their distance by using the stars as [[Physics:Standard candle|standard candle]]s.{{sfn|Hoskin|Dewhirst|1999|pp=292–296}} The distance he found was far greater than the size of the Milky Way, which led him to the conclusion that many similar objects were "island universes" on their own.{{sfn|ESA, ''Edwin Powell Hubble''}}{{sfn|PBS, ''Edwin Hubble''|1998}}{{sfn|HubbleSite, ''About Edwin Hubble''|2008}} Hubble originally estimated that the Andromeda Galaxy was 900,000 light-years away, but [[Biography:Ernst Öpik|Ernst Öpik]]'s estimate in 1925 put the distance closer to 1.5 million light-years.{{sfn|Hoskin|Dewhirst|1999|pp=292–296}}

The Andromeda Galaxy's two main companions, [[Astronomy:Messier 32|M32]] and [[Astronomy:Messier 110|M110]] (also known as NGC 221 and NGC 205, respectively) are faint elliptical galaxies that lie near it.{{sfn|Bakich|1995|p=54}}{{sfn|Pasachoff|2000|p=244}} M32, visible with a far smaller size of 8.7 by 6.4 arcminutes,{{sfn|Thompson|Thompson|2007|pp=66–73}} compared to M110, appears superimposed on the larger galaxy in a telescopic view as a hazy smudge, M110 also appears slightly larger and distinct from the larger galaxy;{{sfn|Pasachoff|2000|p=244}} M32 is 0.5° south of the core, M110 is 1° northwest of the core.{{sfn|Ridpath|2001|pp=72–74}} M32 was discovered in 1749 by French astronomer [[Biography:Guillaume Le Gentil|Guillaume Le Gentil]] and has since been found to lie closer to Earth than the Andromeda Galaxy itself.{{sfn|Block|2003}} It is viewable in binoculars from a dark site owing to its high surface brightness of 10.1 and overall magnitude of 9.0.{{sfn|Thompson|Thompson|2007|pp=66–73}} M110 is classified as either a [[Astronomy:Dwarf spheroidal galaxy|dwarf spheroidal galaxy]] or simply a generic elliptical galaxy. It is far fainter than M31 and M32, but larger than M32 with a surface brightness of 13.2, magnitude of 8.9, and size of 21.9 by 10.9 arcminutes.{{sfn|Thompson|Thompson|2007|pp=66–73}}

The Andromeda Galaxy has a total of 15 [[Astronomy:List of Andromeda's satellite galaxies|satellite galaxies]], including M32 and M110. Nine of these lie in a plane, which has caused astronomers to infer that they have a common origin. These satellite galaxies, like the satellites of the Milky Way, tend to be older, gas-poor [[Astronomy:Dwarf elliptical galaxy|dwarf elliptical]] and [[Astronomy:Dwarf spheroidal galaxy|dwarf spheroidal galaxies]].{{sfn|Koch|Grebel|2006}}

[[File:NGC 7662 Hubble WikiSky.jpg|thumb|250px|left|The Blue Snowball Nebula as seen through the [[Astronomy:Hubble Space Telescope|Hubble Space Telescope]].]]

Along with the Andromeda Galaxy and its companions, the constellation also features [[Astronomy:NGC 891|NGC 891]] (Caldwell 23), a smaller galaxy just east of [[Astronomy:Gamma Andromedae|Almach]]. It is a barred spiral galaxy seen edge-on, with a dark [[Astronomy:Dust lane|dust lane]] visible down the middle. NGC 891 is incredibly faint and small despite its magnitude of 9.9,{{sfn|Moore|2000|pp=328–330}} as its surface brightness of 14.6 indicates;{{sfn|Thompson|Thompson|2007|pp=66–73}} it is 13.5 by 2.8 arcminutes in size.{{sfn|Moore|2000|pp=328–330}} NGC 891 was discovered by the brother-and-sister team of William and [[Biography:Caroline Herschel|Caroline Herschel]] in August 1783.{{sfn|Wilkins|Dunn|2006|pp=348, 366}} This galaxy is at an approximate distance of 30 million light-years from Earth, calculated from its [[Astronomy:Redshift|redshift]] of 0.002.{{sfn|Wilkins|Dunn|2006|pp=348, 366}}

Andromeda's most celebrated [[Astronomy:Open cluster|open cluster]] is [[Astronomy:NGC 752|NGC 752]] (Caldwell 28) at an overall magnitude of 5.7.{{sfn|Moore|2000|pp=328–330}} It is a loosely scattered cluster in the Milky Way that measures 49 arcminutes across and features approximately twelve bright stars, although more than 60 stars of approximately 9th magnitude become visible at low magnifications in a telescope.{{sfn|Thompson|Thompson|2007|pp=66–73}}{{sfn|Ridpath|2001|pp=72–74}} It is considered to be one of the more inconspicuous open clusters.{{sfn|Moore|Tirion|1997|pp=116–117}} The other open cluster in Andromeda is [[Astronomy:NGC 7686|NGC 7686]], which has a similar magnitude of 5.6 and is also a part of the Milky Way. It contains approximately 20 stars in a diameter of 15 arcminutes, making it a tighter cluster than NGC 752.{{sfn|Moore|2000|pp=328–330}}

There is one prominent [[Astronomy:Planetary nebula|planetary nebula]] in Andromeda: [[Astronomy:NGC 7662|NGC 7662]] (Caldwell 22).{{sfn|Moore|2000|pp=328–330}} Lying approximately 3 degrees southwest of [[Astronomy:Iota Andromedae|Iota Andromedae]] at a distance of about 4,000 light-years from Earth, the "Blue Snowball Nebula"{{sfn|Thompson|Thompson|2007|pp=66–73}} is a popular target for amateur astronomers.{{sfn|Pasachoff|2000|p=270}} It earned its popular name because it appears as a faint, round, blue-green object in a telescope, with an overall magnitude of 9.2.{{sfn|Thompson|Thompson|2007|pp=66–73}}{{sfn|Pasachoff|2000|p=270}} Upon further magnification, it is visible as a slightly elliptical annular disk that gets darker towards the center, with a magnitude 13.2 central star.{{sfn|Thompson|Thompson|2007|pp=66–73}}{{sfn|Ridpath|2001|pp=72–74}} The nebula has an overall magnitude of 9.2 and is 20 by 130 arcseconds in size.{{sfn|Moore|2000|pp=328–330}}

=== Meteor showers ===
Each November, the [[Astronomy:Andromedids|Andromedids]] meteor shower appears to radiate from Andromeda.{{sfn|Bakich|1995|p=60}} The shower peaks in mid-to-late November every year, but has a low peak rate of fewer than 2 meteors per hour.{{sfn|Lunsford, ''Meteor Shower List''|2012}} Astronomers have often associated the Andromedids with [[Astronomy:Biela's Comet|Biela's Comet]], which was destroyed in the 19th century, but that connection is disputed.{{sfn|Jenniskens|2008}} Andromedid meteors are known for being very slow and the shower itself is considered to be diffuse, as meteors can be seen coming from nearby constellations as well as from Andromeda itself.{{sfn|Lunsford, ''Activity Nov 19–23''|2011}} Andromedid meteors sometimes appear as red [[Astronomy:Meteoroid#Fireball|fireballs]].{{sfn|Sherrod|Koed|2003|p=58}}{{sfn|Jenniskens|Vaubaillon|2007}} The Andromedids were associated with the most spectacular meteor showers of the 19th century; the storms of 1872 and 1885 were estimated to have a peak rate of 2 meteors per second (a [[Astronomy:Zenithal hourly rate|zenithal hourly rate]] of 10,000), prompting a Chinese astronomer to compare the meteors to falling rain.{{sfn|Jenniskens|2008}}{{sfn|Jenniskens|2006|p=384}} The Andromedids had another outburst on December 3–5, 2011, the most active shower since 1885, with a maximum zenithal hourly rate of 50 meteors per hour. The 2011 outburst was linked to ejecta from Comet Biela, which passed close to the Sun in 1649. None of the meteoroids observed were associated with material from the comet's 1846 disintegration. The observers of the 2011 outburst predicted outbursts in 2018, 2023, and 2036.{{sfn|Wiegert|Brown|Weryk|Wong|2012}}
{{clear}}

==See also==
* Andromeda (Chinese astronomy)
* [[Astronomy:Qatar-3|Qatar-3]]

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  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=lambda+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 30 April 2012
  | ref = {{sfnRef|SIMBAD Lambda Andromedae}}
  }}
* {{cite web
  | title = Omicron Andromedae
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=iota+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 30 April 2012
  | ref = {{sfnRef|SIMBAD Omicron Andromedae}}
  }}
* {{cite web
  | title = Psi Andromedae
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=psi+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 30 April 2012
  | ref = {{sfnRef|SIMBAD Psi Andromedae}}
  }}
* {{cite web
  | title = 37 Andromedae
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=mu+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 29 April 2012
  | ref = {{sfnRef|SIMBAD 37 Andromedae}}
  }}
* {{cite web
  | title = Ups And&nbsp;– High proper-motion Star
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=upsilon+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 29 April 2012
  | ref = {{sfnRef|SIMBAD Ups And}}
  }}
* {{cite web
  | title = Xi Andromedae
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=xi+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 29 April 2012
  | ref = {{sfnRef|SIMBAD Xi Andromedae}}
  }}
* {{cite web
  | title = 29 And (Pi And)
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=pi+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 29 April 2012
  | ref = {{sfnRef|SIMBAD 29 And}}
  }}
* {{cite web
  | title = 51 And
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=51+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 30 April 2012
  | ref = {{sfnRef|SIMBAD 51 And}}
  }}
* {{cite web
  | title = 56 And
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=56+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 29 April 2012
  | ref = {{sfnRef|SIMBAD 56 And}}
  }}
* {{cite web
  | title = R And
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=R+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 30 April 2012
  | ref = {{sfnRef|SIMBAD R And}}
  }}
* {{cite web
  | title = Z And
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Z+andromedae&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
  | access-date = 1 May 2012
  | ref = {{sfnRef|SIMBAD Z And}}
  }}
* {{cite web
  | title = HH And
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=Ross+248
  | access-date = 20 May 2012
  | ref = {{sfnRef|SIMBAD HH And}}
  }}
* {{cite web
  | title = 14 And
  | publisher = Centre de données astronomiques de Strasbourg
  | work = SIMBAD
  | url = http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=14+Andromedae
  | access-date = 20 May 2012
  | ref = {{sfnRef|SIMBAD 14 And}}
  }}
{{Refend}}

== External links ==
{{Commons and category-inline|Andromeda|Andromeda_(constellation)}}
* [http://www.allthesky.com/constellations/andromeda/ The Deep Photographic Guide to the Constellations: Andromeda]
* [http://astrojan.nhely.hu/androm.htm The clickable Andromeda]
* [http://www.ianridpath.com/startales/andromeda.html Ian Ridpath's Star Tales&nbsp;– Andromeda]
* [https://iconographic.warburg.sas.ac.uk/category/vpc-taxonomy-017057 Warburg Institute Iconographic Database (medieval and early modern images of Andromeda)]
* {{cite EB9 |wstitle=Andromeda |volume=2 |page=22|short=x}}
* {{cite NSRW |wstitle=Andromeda |short=x}}

{{Stars of Andromeda}}
{{Constellations}}
{{Sky|00|46|00||37|00|00|10}}
{{DEFAULTSORT:Andromeda (Constellation)}}
[[Category:Andromeda (constellation)| ]]
[[Category:Constellations]]
[[Category:Constellations listed by Ptolemy]]
[[Category:Northern constellations]]

{{Sourceattribution|Andromeda (constellation)}}