| NGC 3021 | |
|---|---|
 NGC 3021 (right of center) as seen by the HST | |
| Observation data (J2000 epoch) | |
| Constellation | Leo Minor[1] |
| Right ascension | 09h 50m 57.146s[2] |
| Declination | 33° 33′ 12.94″[2] |
| Redshift | 0.00514±0.000013[3] |
| Heliocentric radial velocity | 1,537±4 km/s[4] |
| Galactocentric velocity | 1,502±4 km/s[4] |
| Distance | 92.8 Mly (28.44 Mpc)[4] |
| Apparent magnitude (V) | 10.88[3] |
| Apparent magnitude (B) | 12.54[4] |
| Absolute magnitude (V) | −21.25[3] |
| Characteristics | |
| Type | SA(rs)bc,[5] 4.0[4] |
| Apparent size (V) | 1.6′ × 0.9′[3] |
| Notable features | Starburst galaxy[5] |
| Other designations | |
| 2MASX J09505711+3333124, NGC 3021, UGC 5280, PGC 28357[6] | |
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NGC 3021 is a spiral galaxy in the northern constellation of Leo Minor. It is about 93 million light-years away from Earth,[4] and is receding with a heliocentric radial velocity of 1,537±4 km/s.[4] This galaxy was discovered December 7, 1785 by Anglo-German astronomer William Herschel.[7] The morphological classification of NGC 3021 is SA(rs)bc,[5] which indicates a spiral galaxy with no central bar (SA), an incomplete inner ring structure (rs), and moderate to loosely wound spiral arms (bc).
The galaxy contains many Cepheid variable stars. These stars have been used to measure the distances of galaxies. This galaxy was also used to help refine the measurement of the Hubble constant.[8]
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NED Caltechwas invoked but never defined (see the help page). - ^ a b c d e f g Cite error: The named reference
Tully_et_al_2016was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
Anupama1997was invoked but never defined (see the help page). - ^ Cite error: The named reference
SIMBADwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Seligmanwas invoked but never defined (see the help page). - ^ [email protected]. "A cosmological measuring tape". www.spacetelescope.org. Retrieved 2023-11-26.