Astronomy:NGC 495
| NGC 495 | |
|---|---|
 SDSS view of NGC 495 | |
| Observation data (J2000[1] epoch) | |
| Constellation | Pisces[2] |
| Right ascension | 01h 22m 56.0s[3] |
| Declination | +33° 28′ 18″[3] |
| Redshift | +0.013679 ± 0.000073[1] |
| Helio radial velocity | (4073 ± 22) km/s[1] |
| Distance | 184 Mly[4] |
| Apparent magnitude (V) | 13.0[2] |
| Characteristics | |
| Type | SB0-a[2] |
| Apparent size (V) | 1.2' × 0.8'[2] |
| Other designations | |
| PGC 5037, UGC 920, GC 278, MCG 5-4-35, 2MASS J01225595+3328171, H 3.156,[2][1][5] | |
NGC 495, also occasionally referred to as PGC 5037, UGC 920 or GC 278, is a barred spiral galaxy in the constellation Pisces.[2] It is located approximately 184 million light-years from the Solar System[4] and was discovered on 12 September 1784 by astronomer William Herschel.[5]
NGC 495 is part of a galaxy group known as LGG 24. It has at least 6 members, which are NGC 499, NGC 517, NGC 504, NGC 582 and PGC 5026.[6]
Observation history
The object was discovered by Herschel along with NGC 496 and NGC 499. He initially described the discovery as "Three [NGC 495 along with NGC 496 and 499], eS and F, forming a triangle.". As he observed the trio again the next night, he was able to make out more detail: "Three, forming a [right triangle]; the [right angle] to the south NGC 499, the short leg preceding [NGC 495], the long towards the north [NGC 496]. Those in the legs [NGC 495 and 496] the faintest imaginable; that at the rectangle [NGC 499] a deal larger and brighter, but still very faint."[7]
NGC 495 was later also observed by Heinrich d'Arrest and Herman Schultz[5] who first noted the object's accurate position. This position is also noted in the New General Catalogue.[7]
Description
John Dreyer, creator of the New General Catalogue, uses Herschel's initial notation to describe the position of NGC 495 ("very faint, small, 1st of 3").[5]
Modern observations however call NGC 495 a bright central galaxy with an apparent size of about 1.2' by 0.8'. It also includes fainter outer extensions, about 2.6' by 1.5'.[5] The galaxy is also classified as a barred spiral galaxy of Hubble type SB0-a.[2]
Supernova
One supernova has been observed in NGC 495: SN 1999ej (Type Ia, mag. 18.1) was discovered by the Lick Observatory Supernova Search (LOSS) on 18 October 1999.[8][9]
See also
- Barred Spiral Galaxy
- List of NGC objects (1–1000)
- Pisces (constellation)
References
- ↑ 1.0 1.1 1.2 1.3 "NGC 495". http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC+495.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "Revised NGC Data for NGC 495". http://spider.seds.org/ngc/revngcic.cgi?NGC495.
- ↑ 3.0 3.1 "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+495.
- ↑ 4.0 4.1 An object's distance from Earth can be determined using Hubble's law: v=Ho is Hubble's constant (70±5 (km/s)/Mpc). The relative uncertainty Δd/d divided by the distance is equal to the sum of the relative uncertainties of the velocity and v=Ho
- ↑ 5.0 5.1 5.2 5.3 5.4 "New General Catalog Objects: NGC 450 - 499" (in en-US). http://cseligman.com/text/atlas/ngc4a.htm#495.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy & Astrophysics Supplement Series 100: 47–90. Bibcode: 1993A&AS..100...47G.
- ↑ 7.0 7.1 "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm". http://www.astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm.
- ↑ Friedman, A.; King, J. Y.; Li, W. D.; Lick Observatory Supernova Search (1999). "Supernova 1999ej in NGC 495". International Astronomical Union Circular (7286): 1. Bibcode: 1999IAUC.7286....1F. http://www.cbat.eps.harvard.edu/iauc/07200/07286.html#Item1.
- ↑ "SN 1999ej". IAU. https://www.wis-tns.org/object/1999ej.
External links
- NGC 495 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- SEDS
Coordinates: 
01h 22m 56.0s, +33° 28′ 18″
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