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 located approximately 184 million light-years from the Solar System[4] and was discovered on 12 September 1784 by astronomer William Herschel.[5]

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."[6]

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.[6]

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]

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 determinded 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. 1 2 "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm". Astronomy Mall. Retrieved 2017-11-07.

Coordinates: 01h 22m 56.0s, +33° 28′ 18″

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