NGC 1721
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 | |
|---|---|
.jpg.webp) Galaxy group in Eridanus showing NGC 1721, NGC 1723, NGC 1725, and NGC 1728 Credit: Kopernik Observatory & Science Center, Vestal NY | |
| Observation data (J2000 epoch) | |
| Constellation | Eridanus |
| Right ascension | 04h 59m 17.4s[1] |
| Declination | −11° 07′ 07″ [1] |
| Redshift | 0.015010 [1] |
| Helio radial velocity | 4 500 ± 9 km/s [1] |
| Galactocentric velocity | 4 388 ± 10 km/s [1] |
| Distance | 200 Mly (61.3 Mpc) h−1 0.73 [1] |
| Characteristics | |
| Apparent size (V) | 36.92 by 17.58 kpc [1] |
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
- "NED results for object NGC 1721". NASA/IPAC Extragalactic Database (NED). Retrieved March 15, 2012.
- "cseligman.com".
- "NGC 1723 Group". DeepSkyPedia.
- "Observations of nebulae with the 36-inch refractor of the Lick Observatory – by S. W. Burnham (Publications of the Lick Observatory)". Bibcode:1894PLicO...2..168B. Cite journal requires
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External links
Media related to NGC 1721 at Wikimedia Commons
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