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| NGC 3640 | |
|---|---|
 legacy surveys image of NGC 3640 and NGC 3641 (bottom) | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 11h 21m 06.8s[1] |
| Declination | +03° 14′ 05″[1] |
| Redshift | 0.004330 ± 0.000017 [1] |
| Heliocentric radial velocity | 1,298 ± 5 km/s[1] |
| Distance | 75.4 ± 25 Mly (23.1 ± 7.7 Mpc)[1] |
| Apparent magnitude (V) | 10.3 [2] |
| Characteristics | |
| Type | E3 [1] |
| Apparent size (V) | 4.0′ × 3.2′ [1] |
| Other designations | |
| UGC 6368, CGCG 039-130, MCG +01-29-033, PGC 34778[1] | |
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NGC 3640 is an elliptical galaxy located in the constellation Leo. It is located at a distance of circa 75 million light years from Earth, which, given its apparent dimensions, means that NGC 3640 is about 90,000 light years across. It was discovered by William Herschel on February 23, 1784.[3] It is a member of the NGC 3640 Group of galaxies, which is a member of the Leo II Groups, a series of galaxies and galaxy clusters strung out from the right edge of the Virgo Supercluster.[4]
It lies 2 degrees south of Sigma Leonis and is a member of the Herschel 400 Catalogue. It is condensed and can be spotted with a small telescope from suburban skies.[5]
- ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 3640. Retrieved 2016-01-18.
- ^ "Revised NGC Data for NGC 3640". spider.seds.org. Retrieved 25 November 2018.
- ^ Seligman, Courtney. "NGC 3640". Celestial Atlas. Retrieved 19 November 2018.
- ^ "The Leo III Groups". Atlas of the Universe. Archived from the original on July 22, 2012. Retrieved 2010-11-27.
- ^ O'Meara, Steve (2007). Herschel 400 Observing Guide. Cambridge University Press. p. 128. ISBN 9780521858939.