NGC_1721 Knowpia

NGC 1721
NGC 1721
	Galaxy group in Eridanus showing NGC 1721, NGC 1723, NGC 1725, and NGC 1728. NGC 1721 is the right galaxy in the compact group in the middle.
Observation data (J2000 epoch)
Constellation	Eridanus
Right ascension	04h 59m 17.4s
Declination	−11° 07′ 07″
Redshift	0.015010
Heliocentric radial velocity	4 500 ± 9 km/s
Galactocentric velocity	4 388 ± 10 km/s
Distance	200 Mly (61.3 Mpc)
Characteristics
Type	(R')SAB00(s)
Size	36.92 by 17.58 kpc
Other designations
	MCG -02-13-027, PGC 16484

NGC 1721 is a lenticular galaxy (S0) located in the constellation Eridanus. It was discovered on the 10th of Nov 1885^[2] by Edward Emerson Barnard. This galaxy is a member of the NGC 1723 Group—consisting of NCG 1723 (the brightest member, 11.7-mag) and a close triplet of NGC 1721, NGC 1725 and NGC 1728.^[3]

NGC 1721 is a Dreyer Object (a now archaic astronomical term), meaning that it was included in the original New General Catalogue by JLE Dreyer.^[4]

References edit

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ "NED results for object NGC 1721". NASA/IPAC Extragalactic Database (NED). Retrieved March 15, 2012.
^ "cseligman.com".
^ "NGC 1723 Group". DeepSkyPedia.
^ Burnham, S. W. (1894). "Observations of nebulae with the 36-inch refractor of the Lick Observatory – by S. W. Burnham (Publications of the Lick Observatory)". Publications of Lick Observatory. 2: 168. Bibcode:1894PLicO...2..168B.