Galaxy in the constellation Leo Minor
NGC 3021 is aspiral galaxy in the northernconstellation ofLeo Minor . It is about 93 millionlight-years away fromEarth ,[ 4] radial velocity of± 4 km/s[ 4] William Herschel on December 7, 1785.[ 7] [ 8] morphological classification of NGC 3021 is SA(rs)bc,[ 5] bar (SA), an incomplete inner ring structure (rs), and moderate to loosely woundspiral arms (bc).
Thegalaxy contains manyCepheid variable stars. Thesestars have been used to measure the distances of galaxies. This galaxy was also used to help refine the measurement of theHubble constant .[ 9]
Spiral galaxy NGC 3021. Twosupernovae have been observed in NGC 3021:
SN 1995al (Type Ia , mag. 13) was discovered by S. Pesci and P. Mazza in Milan, Italy, on November 1, 1995.[ 10] ″ [ 11] spectrum was found to be similar toSN 1981b near maximum.[ 12] SN 2023bvj (Type II , mag. 17.287) was discovered byATLAS on February 18, 2023.[ 13] ^ Hille, Karl (July 30, 2015)."Hubble View of a Cosmological Measuring Tape" . NASA. RetrievedOctober 2, 2015 . ^a b Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties" .Astronomy & Astrophysics 616 . A1.arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source atVizieR .^a b c d e f "NASA/IPAC Extragalactic Database (NED)" .California Institute of Technology . RetrievedOctober 2, 2015 .^a b c d e f g Tully, R. Brent; et al. (August 2016)."Cosmicflows-3" .The Astronomical Journal .152 (2): 21.arXiv :1605.01765 Bibcode :2016AJ....152...50T .doi :10.3847/0004-6256/152/2/50 S2CID 250737862 . 50. ^a b c Anupama, G. C. (November 1997). "Optical Spectra of Recent Supernovae of Type Ia: SN1995AL, SN1997Y, SN1997BP".Astronomical Journal .114 : 2054.Bibcode :1997AJ....114.2054A .doi :10.1086/118625 . ^ "NGC 3021" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2021-12-17 .^ Herschel, W. (1789)."Catalogue of a Second Thousand of New Nebulae and Clusters of Stars; with a Few Introductory Remarks on the Construction of the Heavens" .Philosophical Transactions of the Royal Society of London 79 :212– 255.Bibcode :1789RSPT...79..212H .doi :10.1098/rstl.1789.0021 ^ Seligman, C."NGC Objects: NGC 3000 - 3049" .Celestial Atlas . Retrieved2021-12-17 . ^ information@eso.org."A cosmological measuring tape" .www.spacetelescope.org . Retrieved2023-11-26 . ^ "SN 1995al" .Transient Name Server .IAU . Retrieved15 June 2025 .^ Pesci, S.; et al. (November 1995). Green, D. W. E. (ed.)."Supernova 1995al in NGC 3021" .IAU Circular .6255 (1): 1.Bibcode :1995IAUC.6255....1P . ^ Wei, J. -Y.; et al. (November 1995). Green, D. W. E. (ed.). "Supernova 1995al in NGC 3021".IAU Circular .6256 (1): 1.Bibcode :1995IAUC.6256....1W . ^ "SN 2023bvj | Transient Name Server" .www.wis-tns.org . Retrieved2023-07-06 .NGC 3021 at Wikimedia Commons
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Media related toNGC 3021 at Wikimedia Commons
