NGC 501

NGC 501
NGC 501
	SDSS view of NGC 501
Observation data (J2000 epoch)
Constellation	Pisces
Right ascension	01h 23m 22.4s
Declination	+33° 25′ 59″
Redshift	0.016561 ± 0.000227
Heliocentric radial velocity	(4924 ± 68) km/s
Distance	224 Mly
Apparent magnitude (V)	14.5
Apparent magnitude (B)	15.5
Characteristics
Type	E0
Apparent size (V)	0.5' × 0.5'
Other designations
	PGC 5082, GC 284, 2MASS J01232240+3325582

NGC 501, also occasionally referred to as PGC 5082 or GC 284, is an elliptical galaxy in the constellation Pisces.^[2] It is located approximately 224 million light-years from the Solar System^[4] and was discovered on 28 October 1856 by Irish astronomer R. J. Mitchell.^[5]

Observation history

Although John Dreyer, creator of the New General Catalogue, credits the discovery to astronomer William Parsons, 3rd Earl of Rosse, he notes that many of his claimed discoveries were made by one of his assistants. In the case of NGC 501, the discovery was made by R. J. Mitchell,^[5] who discovered it using Lord Rosse's 72" reflecting telescope at Birr Castle in County Offaly, Ireland.^[6] The object was described "very faint, small (E in Birr diagram)" in the New General Catalogue.^[5]

^ ^a ^b ^c ^d "NGC 501". Retrieved 2017-12-09.
^ ^a ^b ^c ^d ^e ^f "Revised NGC Data for NGC 501". 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=H_o 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=H_o
^ ^a ^b ^c ^d "New General Catalog Objects: NGC 500 - 549". cseligman.com. Retrieved 2017-10-16.
^ "Photos". www.klima-luft.de. Retrieved 2017-12-09.

v t e Astronomical catalogs
NGC	NGC 496 NGC 497 NGC 498 NGC 499 NGC 500 NGC 501 NGC 502 NGC 503 NGC 504 NGC 505 NGC 506
PGC	PGC 5078 PGC 5079 PGC 5080 PGC 5081 PGC 5082 PGC 5083 PGC 5084 PGC 5085 PGC 5086