NGC 495

NGC 495
NGC 495
SDSS view of NGC 495
Observation data (J2000 epoch)
ConstellationPisces
Right ascension01h 22m 56.0s
Declination+33° 28′ 18″
Redshift+0.013679 ± 0.000073
Heliocentric radial velocity(4073 ± 22) km/s
Distance184 Mly
Apparent magnitude (V)13.0
Characteristics
TypeSB0-a
Apparent size (V)1.2' × 0.8'
Other designations
PGC 5037, UGC 920, GC 278, MCG 5-4-35, 2MASS J01225595+3328171, H 3.156,

NGC 495, also occasionally referred to as PGC 5037, UGC 920 or GC 278, is a barred spiral galaxy in the constellation Pisces. It is located approximately 184 million light-years from the Solar System and was discovered on 12 September 1784 by astronomer William Herschel.

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.

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."

NGC 495 was later also observed by Heinrich d'Arrest and Herman Schultz who first noted the object's accurate position. This position is also noted in the New General Catalogue.

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").

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'. The galaxy is also classified as a barred spiral galaxy of Hubble type SB0-a.

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.

See also

References

  1. 1 2 3 4 "NGC 495". Retrieved 2017-11-07.
  2. 1 2 3 4 5 6 7 "Revised NGC Data for NGC 495". spider.seds.org. Retrieved 2017-10-05.
  3. 1 2 "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-11-07.
  4. 1 2 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. 1 2 3 4 5 "New General Catalog Objects: NGC 450 - 499". cseligman.com. Retrieved 2017-11-07.
  6. ↑ 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. 1 2 "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm". Astronomy Mall. Retrieved 2017-11-07.
  8. ↑ 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.
  9. ↑ "SN 1999ej". Transient Name Server. IAU. Retrieved 19 March 2026.