Astronomy:V1500 Cygni

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V1500 Cygni
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  21h 11m 36.581s[1]
Declination +48° 09′ 01.95″[1]
Apparent magnitude (V) 1.69 to <21[2]
Variable type Fast nova[2] + asynchronous polar[3]
Parallax (π)0.7770 ± 0.1867[1] mas
Distanceapprox. 4,000 ly
(approx. 1,300 pc)
Absolute magnitude (MV)−10.7 (maximum)[4] to +7.8 (minimum)[5]
Mass1.20[6] M
Radius0.009[7] R
Luminosity5[7] L
Temperature54,000[5] K
Radius0.42[5] R
Temperature3,000 - 5,200[5] K
Other designations
RX J2111.6+4809, Nova Cyg 1975, AAVSO 2108+47
Database references
AAVSO light curve for Nova Cygni 1975. The dates given are Julian day numbers.

V1500 Cygni or Nova Cygni 1975 was a bright nova occurring in 1975 in the constellation Cygnus. It had the second highest intrinsic brightness of any nova of the 20th century, exceeded only by CP Puppis in 1942.[8]

V1500 Cygni was discovered on 29 August 1975, and reached an apparent brightness of magnitude 1.7 on the next day. It remained visible to the naked eye for about a week, and 680 days after maximum the star had dimmed by 12.5 magnitudes.

It is an AM Herculis type star, consisting of a red dwarf secondary depositing a stream of material onto a highly magnetized white dwarf primary. The distance of the V1500 Cygni was calculated in 1977 by the McDonald Observatory at 1.95 kiloparsecs (6,360 light years).[9] Additionally, V1500 Cyg was the first asynchronous polar to be discovered. This distinction refers to the fact that the white dwarf's spin period is slightly different from the binary orbital period.[10]

See also

  • Nova Cygni 1920
  • Nova Cygni 1992


  1. 1.0 1.1 1.2 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. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1: B/gcvs. Bibcode2009yCat....102025S. 
  3. Pavlenko, E. P.; Mason, P. A.; Sosnovskij, A. A.; Shugarov, S. Yu; Babina, Ju V.; Antonyuk, K. A.; Andreev, M. V.; Pit, N. V. et al. (2018). "Asynchronous polar V1500 Cyg: Orbital, spin, and beat periods". Monthly Notices of the Royal Astronomical Society 479 (1): 341. doi:10.1093/mnras/sty1494. Bibcode2018MNRAS.479..341P. 
  4. Harrison, Thomas E.; Campbell, Ryan K. (2016). "The apparent synchronization of V1500 Cygni". Monthly Notices of the Royal Astronomical Society 459 (4): 4161. doi:10.1093/mnras/stw961. Bibcode2016MNRAS.459.4161H. 
  5. 5.0 5.1 5.2 5.3 Harrison, Thomas E.; Campbell, Ryan K. (2018). "The detection of discrete cyclotron emission features in phase-resolved optical spectroscopy of V1500 Cygni". Monthly Notices of the Royal Astronomical Society 474 (2): 1572. doi:10.1093/mnras/stx2881. Bibcode2018MNRAS.474.1572H. 
  6. Hachisu, Izumi; Kato, Mariko (2019). "A Light-curve Analysis of 32 Recent Galactic Novae: Distances and White Dwarf Masses". The Astrophysical Journal Supplement Series 242 (2): 18. doi:10.3847/1538-4365/ab1b43. Bibcode2019ApJS..242...18H. 
  7. 7.0 7.1 Schmidt, Gary D.; Liebert, James; Stockman, H. S. (1995). "Detection of the Hot White Dwarf in the Magnetic Nova V1500 Cygni with the Hubble Space Telescope". The Astrophysical Journal 441: 414. doi:10.1086/175365. Bibcode1995ApJ...441..414S. 
  8. "V1500 Cyg (Nova Cygni 1975)". Retrieved 2019-10-31. 
  9. Ferland, G. J. (1977). "The interstellar reddening and distance of Nova Cygni 1975 /V1500 Cygni/". Astrophysical Journal 215: 873. doi:10.1086/155424. Bibcode1977ApJ...215..873F. 
  10. Stockman, H. S.; Schmidt, Gary D.; Lamb, D. Q. (1988). "V1500 Cygni - Discovery of a magnetic nova". The Astrophysical Journal 332: 282. doi:10.1086/166652. Bibcode1988ApJ...332..282S. 

Further reading

External links