Key facts
- Constellation
- Leo Minor
- Right ascension
- 09 50 57.146
- Declination
- +33 ° 33 ′ 12.94 ″
- Redshift
- 0.005 120 ± 0.000 009
- Heliocentric radial velocity
- 1,537 ± 4 km/s
- Galactocentric velocity
- 1,502 ± 4 km/s
- Distance
- 92.8 Mly (28.44 Mpc )
- Absolute magnitude v
- −21.25
- Type
- SA(rs)bc, 4.0
- Size
- ~49,100 ly (15.06 kpc ) (estimated)
- Apparent size v
- 1.6′ × 0.9′
- Notable features
- Starburst galaxy
via Wikipedia infobox
Wikidata facts
- Distance from Earth
- 30
- Image
- NGC 3021 Hubble.jpg
Show 9 more facts
- catalog code
- Gaia DR2 793677834242060288
- Commons category
- NGC 3021
- time of discovery or invention
- 1785-12-07
- apparent magnitude
- 14.120
- radial velocity
- 1600
- galaxy morphological type
- SAc
- right ascension
- 147.73810782862030
- declination
- 33.55359512075630
- redshift
- 0.00535
via Wikidata · CC0
~1 min read
Article
NGC 3021 is a spiral galaxy in the northern constellation of Leo Minor. It is about 93 million light-years away from Earth, and is receding with a heliocentric radial velocity of 1,537±4 km/s. This galaxy was discovered by German-British astronomer William Herschel on December 7, 1785. The morphological classification of NGC 3021 is SA(rs)bc, 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.
Connections
list of stars in Leo Minor
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Q1105445
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list of NGC objects (3001–4000)
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epoch
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NGC 3977
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NGC 3632
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Earth
Concept
star
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galaxy
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light-year
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constellation
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nebula
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William Herschel
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Hubble Space Telescope
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supernova
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exoplanet
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digital object identifier
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parsec
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International Astronomical Union
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redshift
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