Astronomy:NGC 3021

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NGC 3021
NGC 3021 (right of center) imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationLeo Minor[1]
Right ascension 09h 50m 57.146s[2]
Declination+33° 33′ 12.94″[2]
Redshift0.005120±0.000009[3]
Helio radial velocity1,537±4 km/s[4]
Galactocentric velocity1,502±4 km/s[4]
Distance92.8 Mly (28.44 Mpc)[4]
Apparent magnitude (V)10.88[3]
Apparent magnitude (B)12.54[4]
Absolute magnitude (V)−21.25[3]
Characteristics
TypeSA(rs)bc,[5] 4.0[4]
Size~49,100 ly (15.06 kpc) (estimated)[3]
Apparent size (V)1.6′ × 0.9′[3]
Notable featuresStarburst galaxy[5]
Other designations
IRAS 09479+3347, UGC 5280, MCG+06-22-019, PGC 28357[6][3]

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 by German-British astronomer William Herschel on December 7, 1785.[7][8] 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.[9]

Spiral galaxy NGC 3021.

Supernovae

Two supernovae 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] G. M. Hurst in England confirmed the finding, estimating the magnitude at 13.2. The supernova was offset 15.0″ west and 2.9″ south of the galactic nucleus.[11] The spectrum was found to be similar to SN 1981b near maximum.[12]
  • SN 2023bvj (Type II, mag. 17.287) was discovered by ATLAS on February 18, 2023.[13]

See also

References

  1. ↑ Hille, Karl (July 30, 2015). "Hubble View of a Cosmological Measuring Tape". NASA. https://www.nasa.gov/content/goddard/hubble-view-of-a-cosmological-measuring-tape. 
  2. ↑ 2.0 2.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "NASA/IPAC Extragalactic Database (NED)". California Institute of Technology. http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=21102. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Tully, R. Brent et al. (August 2016). "Cosmicflows-3". The Astronomical Journal 152 (2): 21. doi:10.3847/0004-6256/152/2/50. 50. Bibcode: 2016AJ....152...50T. 
  5. ↑ 5.0 5.1 5.2 Anupama, G. C. (November 1997). "Optical Spectra of Recent Supernovae of Type Ia: SN1995AL, SN1997Y, SN1997BP". Astronomical Journal 114: 2054. doi:10.1086/118625. Bibcode: 1997AJ....114.2054A. 
  6. ↑ "NGC 3021". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+3021. 
  7. ↑ 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. doi:10.1098/rstl.1789.0021. Bibcode: 1789RSPT...79..212H. 
  8. ↑ Seligman, C.. "NGC Objects: NGC 3000 - 3049". Celestial Atlas. https://cseligman.com/text/atlas/ngc30.htm#3021. 
  9. ↑ information@eso.org. "A cosmological measuring tape" (in en). https://www.spacetelescope.org/images/potw1513a/. 
  10. ↑ "SN 1995al". IAU. https://www.wis-tns.org/object/1995al. 
  11. ↑ 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. http://www.cbat.eps.harvard.edu/iauc/06200/06255.html#Item1. 
  12. ↑ 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. 
  13. ↑ "SN 2023bvj | Transient Name Server". https://www.wis-tns.org/object/2023bvj. 



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