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]
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
- ^ a b c d "NGC 508". Retrieved 2017-12-09.
- ^ a b c d e f "Revised NGC Data for NGC 508". spider.seds.org. Retrieved 2017-10-05.
- ^ a b "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-10-05.
- ^ a b 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
- ^ a b c d "New General Catalog Objects: NGC 500 - 549". cseligman.com. Retrieved 2017-10-16.
- ^ a b "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm".
External links
- NGC 508 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- SEDS
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