NGC 503

NGC 503
NGC 503
	SDSS view of NGC 503
Observation data (J2000 epoch)
Constellation	Pisces
Right ascension	01h 23m 28.4s
Declination	+33° 19′ 54″
Redshift	0.01975 ± 0.00007
Heliocentric radial velocity	(5862 ± 21) km/s
Distance	265 Mly
Apparent magnitude (V)	14.1
Apparent magnitude (B)	15.1
Characteristics
Type	E-S0
Apparent size (V)	0.9' × 0.7'
Other designations
	PGC 5086, GC 5169, MGC +05-04-040, 2MASS J01232845+3319542

NGC 503, also occasionally referred to as PGC 5086 or GC 5169, is an elliptical galaxy in the constellation Pisces.^[2] It is located approximately 265 million light-years from the Solar System^[4] and was discovered on 13 August 1863 by German astronomer Heinrich Louis d'Arrest.^[5]

Observation history

Arrest discovered NGC 503 using an 11" reflecting telescope in Copenhagen. His position matches perfectly with PGC 5086. At the time of discovery, he considered the possibility of having observed one of William Herschels discoveries (NGC 495, 496, 499).^[6] John Louis Emil Dreyer, creator of the New General Catalogue, described the galaxy as "extremely faint, extremely small" with a "double star 4 arcmin to southwest".^[5]

^ ^a ^b ^c ^d "NGC 503". Retrieved 2017-12-09.
^ ^a ^b ^c ^d ^e ^f "Revised NGC Data for NGC 503". 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 "New General Catalog Objects: NGC 500 - 549". cseligman.com. Retrieved 2017-10-16.
^ "astronomy-mall.com/Adventures.In.Deep.Space/NGC%201-7840%20complete.htm".