Astronomy:NGC 4559

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NGC 4559
NGC 4559 imaged by the Sloan Digital Sky Survey
Observation data (J2000 epoch)
ConstellationComa Berenices
Right ascension 12h 35m 57.6285s[1]
Declination+27° 57′ 35.851″[1]
Redshift0.002715±0.000002[1]
Helio radial velocity814 ± 1 km/s[1]
Distance24.56 ± 1.58 Mly (7.530 ± 0.483 Mpc)[1]
Apparent magnitude (V)10.4[1]
Characteristics
TypeSAB(rs)cd[1]
Size~92,900 ly (28.48 kpc) (estimated)[1]
Apparent size (V)10.7′ × 4.4′[1]
Other designations
HOLM 423A, IRAS 12334+2814, UGC 7766, MCG+05-30-030, PGC 42002[1]

NGC 4559 (also known as Caldwell 36) is an intermediate spiral galaxy with a weak inner ring structure in the constellation Coma Berenices. Its velocity with respect to the cosmic microwave background is 1,096±20 km/s, which corresponds to a Hubble distance of 52.7 ± 3.8 Mly (16.17 ± 1.17 Mpc).[1] However, 26 non-redshift measurements give a much closer distance of 24.56 ± 1.58 Mly (7.530 ± 0.483 Mpc).[2] It was discovered by German-British astronomer William Herschel on 11 April 1785.[3][4]

NGC 4559 is a member of the Coma I Group.[5][6]

Supernova

One supernova has been recorded in NGC 4559: SN 1941A (Type II-L, mag. 13.2)[7] was discovered by Rebecca Jones on 24 February 1941, and after checking previous photographs of the galaxy, it was determined that the supernova was visible starting 5 February 1941.[8]

Luminous Blue Variable

NGC 4559 is home to the luminous blue variable AT 2016blu (also known as PSN J12355230+2755559, or as NGC 4559OT). It was discovered by the Lick Observatory Supernova Search (LOSS) on 11 January 2012.[9][10] It experiences repeated supernova-like outbursts: first when discovered, then again in 2014, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2024, and 2025.[11][12]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 4559". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+4559. 
  2. ↑ "Distance Results for NGC 4559". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+4559. 
  3. ↑ Herschel, W. (1786). "Catalogue of One Thousand New Nebulae and Clusters of Stars". Philosophical Transactions of the Royal Society of London 76: 457–499. doi:10.1098/rstl.1786.0027. Bibcode: 1786RSPT...76..457H. https://zenodo.org/record/1432282/files/article.pdf. 
  4. ↑ Seligman, Courtney. "NGC 4559". https://cseligman.com/text/atlas/ngc45a.htm#4559. 
  5. ↑ Sandage, A.; Tammann, G.A. (1975). "Steps toward the Hubble constant. V - The Hubble constant from nearby galaxies and the regularity of the local velocity field" (in en). The Astrophysical Journal 196: 313–328. doi:10.1086/153413. ISSN 0004-637X. Bibcode: 1975ApJ...196..313S. 
  6. ↑ Gregory, S.A.; Thompson, L. A. (1977). "The Coma I Galaxy Cloud" (in en). The Astrophysical Journal 213: 345–350. doi:10.1086/155160. ISSN 0004-637X. Bibcode: 1977ApJ...213..345G. 
  7. ↑ "SN 1941A". IAU. https://www.wis-.tns.org/object/1941A. 
  8. ↑ Elis, Stromgren (24 April 1941). "Circular No. 861". Observatory Copenhagen. http://www.cbat.eps.harvard.edu/IAUCs/IAUC0861.jpg. 
  9. ↑ Kandrashoff, M.; Cenko, S. B.; Li, W.; Filippenko, A. V.; Guerrini, G.; Rosi, P.; Tinjaca Ramirez, L. M.; Pastorello, A. et al. (2012). "PSN J12355230+2755559 in NGC 4559". Central Bureau Electronic Telegrams (2976): 1. Bibcode: 2012CBET.2976....1K. http://www.cbat.eps.harvard.edu/iau/cbet/002900/CBET002976.txt. 
  10. ↑ "SN 2016blu". IAU. https://www.wis-tns.org/object/2016blu. 
  11. ↑ Bishop, David (6 July 2021). "LBV 2016blu in NGC 4559". https://www.rochesterastronomy.org/sn2012/lbvn4559.html. 
  12. ↑ Aghakhanloo, Mojgan; Smith, Nathan; Milne, Peter; Andrews, Jennifer E.; Van Dyk, Schuyler D.; Filippenko, Alexei V.; Jencson, Jacob E.; Lau, Ryan M. et al. (2022). "Recurring outbursts of the supernova impostor AT 2016blu in NGC 4559". Monthly Notices of the Royal Astronomical Society 526 (1): 456. doi:10.1093/mnras/stad2702. Bibcode: 2023MNRAS.526..456A. 



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