Astronomy:Lacerta

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Short description: Constellation in the northern celestial hemisphere
Lacerta
Constellation
Lacerta
AbbreviationLac
GenitiveLacertae
Pronunciation/læˈkɜːrtə/,
genitive /læˈkɜːrti/
Symbolismthe Lizard
Right ascension 22.5h
Declination+45°
QuadrantNQ4
Area201 sq. deg. (68th)
Main stars5
Bayer/Flamsteed
stars		17
Stars with planets12
Stars brighter than 3.00m0
Stars within 10.00 pc (32.62 ly)1
Brightest starα Lac (3.76m)
Messier objects0
Bordering
constellations		Andromeda
Cassiopeia
Cepheus
Cygnus
Pegasus
Visible at latitudes between +90° and −40°.
Best visible at 21:00 (9 p.m.) during the month of October.

Lacerta is one of the 88 modern constellations defined by the International Astronomical Union. Its name is Latin for lizard. A small, faint constellation, it was defined in 1687 by the astronomer Johannes Hevelius. Its brightest stars form a "W" shape similar to that of Cassiopeia, and it is thus sometimes referred to as 'Little Cassiopeia'. It is located between Cygnus, Cassiopeia and Andromeda on the northern celestial sphere. The northern part lies on the Milky Way.

Notable features

The constellation Lacerta as it can be seen by the naked eye.

Lacerta is typical of Milky Way constellations: no bright galaxies, nor globular clusters, but instead open clusters, for example NGC 7243, the faint planetary nebula IC 5217 and quite a few double stars. It also contains the prototypic blazar BL Lacertae. Lacerta contains no Messier objects.

Stars

Alpha Lacertae is a blue-white hued main-sequence star of magnitude 3.8, 102 light-years from Earth. It has a spectral type of A1 V[1] and is an optical double star. Beta Lacertae is far dimmer, a yellow giant of magnitude 4.4, 170 light-years from Earth.[2]

Roe 47 is a multiple star consisting of five components (magnitudes 5.8, 9.8, 10.1, 9.4, 9.8).

ADS 16402 is a binary star system in Lacerta, around which a planet orbits with some unusual properties.[3] The Jupiter-sized planet exhibits an unexpectedly low density, about the same as cork. This planet is dubbed HAT P-1.

EV Lacertae is a rapidly spinning magnitude 10 red dwarf with a strong magnetic field. It is a flare star that can emit powerful flares potentially visible to the naked eye, thousands of times more energetic than any from Earth's sun.

HD 215441 (22h 44m.2 / +55° 35') is known as Babcock's Magnetic Star. Source: Sky Catalogue 2000.0 Volume 2: Double Stars, Variable Stars and Nonstellar Objects, page xlv, chapter Glossary of Selected Astronomical Names.

Deep-sky objects

NGC 7243 is an open cluster 2500 light-years from Earth, visible in small amateur telescopes. It has a few dozen "scattered" stars, the brightest of which are of the 8th magnitude.[2]

BL Lacertae is the prototype of the BL Lacertae objects, which appear to be dim variable stars but are actually the variable nuclei of elliptical galaxies; they are similar to quasars.[2] It lent its name to a whole type of celestial objects, the BL Lacertae objects (a subtype of blazar). The object varies irregularly between magnitudes 14 and 17 over a few days.

History

Lacerta can be seen on the left of this 1825 star map from Urania's Mirror

Centred on a region of the sky without apparently bright stars, Lacerta was apparently not regarded as a constellation by ancient Western astronomers. Johannes Hevelius created the constellation in 1687 and initially named it "Stellio" (the stellion), a lizard with star-like dorsal spots found along the Mediterranean coast.[4]

Other Europeans who sought to name this new constellation[dubious – discuss] included Augustin Royer, who created Sceptrum et Manus Iustitiae (the Hand of Justice and Sceptre) to honor Louis XIV in 1670, and Johann Elert Bode, who created Frederici Honores (Frederick's Glory) to honor Frederick the Great in 1787. Both Sceptrum and Frederici Honores are now obsolete, while Lacerta still survives.[2]

Equivalents

Although not included in ancient star charts of Europe and the Near East, the stars of Lacerta, along with some in the eastern portion of Cygnus, were coincidentally combined by early Chinese astronomers into their "Flying serpent".[4] Similarly, the Chumash people of California call this part of the sky 'Lizard' and include it in multiple stories.[citation needed]

Namesakes

USS Lacerta (AKA-29) was an attack cargo ship in the United States navy named after the constellation.

See also

  • Lacerta (Chinese astronomy)

References

  1. ↑ Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C. 
  2. ↑ 2.0 2.1 2.2 2.3 Ridpath & Tirion 2008, pp. 164-165.
  3. ↑ Puzzling Puffy Planet, Less Dense Than Cork, Is Discovered - New York Times
  4. ↑ 4.0 4.1 Allen 1899, p. 251.

Sources

External links

Coordinates: Sky map 22h 30m 00s, +45° 00′ 00″



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