NGC 508

NGC 508, also occasionally referred to as PGC 5099 or UGC 939, is an elliptical galaxy in the constellation Pisces.[2] It is located approximately 247 million light-years from the Solar System[4] and was discovered on 12 September 1784 by British astronomer William Herschel.[5] [6]

NGC 508
NGC 508
SDSS view of NGC 508
Observation data (J2000[1] epoch)
ConstellationPisces[2]
Right ascension01h 23m 40.6s[3]
Declination+33° 16′ 49″[3]
Redshift0.01835 ± 0.00007[1]
Heliocentric radial velocity(5451 ± 21) km/s[1]
Distance247 Mly[4]
Apparent magnitude (V)13.1[2]
Apparent magnitude (B)14.1[2]
Characteristics
TypeE[2]
Apparent size (V)1.1' × 1.1'[2]
Other designations
PGC 5099, UGC 939, GC 295, MGC +05-04-045, 2MASS J01234058+3316502 [1][5]

Observation history

Herschel discovered NGC 508 along with NGC 507 and described the objects as "Two. Both eF, S, but unequal.". His observed position was catalogued and is accurate.[6] John Louis Emil Dreyer, creator of the New General Catalogue, described the galaxy as "very faint, small, northern of two", with the other object being NGC 507.[5]

Description

The galaxy has an apparent size of 1.1 × 1.1 arcmins and a recessional velocity of 5525 kilometers per second. It is thought to be a group member with NGC 507, but as there is no evidence of interaction between the objects, the two are not necessarily a physical pair. Although NGC 508 is usually treated as part of Arp 229, the description of the Arp-galaxy only applies to the larger NGC 507. Therefore, the term Arp 229 should only be used as an alternative designation for NGC 507.[5]

See also

References
  1. "NGC 508". Retrieved 2017-12-09.
  2. "Revised NGC Data for NGC 508". spider.seds.org. Retrieved 2017-10-05.
  3. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-10-05.
  4. 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. "New General Catalog Objects: NGC 500 - 549". cseligman.com. Retrieved 2017-10-16.
  6. "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm".
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