Not to be confused with Upsilon Scorpii.

U Scorpii (U Sco) is a recurrent nova system, one of 10 known recurring novae in the Milky Way galaxy.[5] Located near the northern edge of the constellation Scorpius it normally has a magnitude of 18, but reaches a magnitude of about 8 during outbursts. Outbursts have been observed in 1863, 1906, 1936, 1979, 1987, 1999,[6] 2010,[7] and 2022.

The 2010 outburst was predicted to occur April 2009 ± 1.0 year, based on observations during quiescence following the 1999 outburst.[8] The U Sco 2010 eruption faded by 1 magnitude in 1 day, and by 4 magnitudes in 6 days. By February 6 it was dimmer than magnitude 13. Between February 10–19, it was flickering around magnitude 14. The eruption ended on day 64, which is the fastest observed decline to quiescence of a recurring nova.[9] This eruption of U Sco became the best-observed nova event to its day, with 22,000 magnitudes accumulated.[9] Astronomers then predicted that another eruption of U Sco would occur in 2020±2. This prediction was correct: it brightened to +7.8 magnitude on 6 June 2022.[citation needed]

AAVSO light curve of recurrent nova U Sco from 1 Jan 2010 to 1 Sept 2010. Up is brighter and down is fainter. Day numbers are Julian day. Different colors reflect different bandpasses.

Originally identified as a nova in 1863 by English astronomer N.R. Pogson, U Scorpii was the third nova to be identified as recurrent, by American astronomer and historian of science Helen L. Thomas, in the years preceding World War II.[10][11]

References

  1. ^ 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 at VizieR.
  2. ^ a b c Schaefer, Bradley E. (2018). "The distances to Novae as seen by Gaia". Monthly Notices of the Royal Astronomical Society. 481 (3): 3033–3051. arXiv:1809.00180. Bibcode:2018MNRAS.481.3033S. doi:10.1093/mnras/sty2388. S2CID 118925493.
  3. ^ a b "U Scorpii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-17.
  4. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. ^ Comprehensive Photometric Histories of All Known Galactic Recurrent Novae, B. Schaefer
  6. ^ The 1999 Outburst of the Recurrent Nova U Scorpii, Anupama & Dewangan
  7. ^ Thar She Blows! U Scorpii Erupts as Predicted, A. MacRobert
  8. ^ B. Schaefer; A. Pagnotta; et al. (October 2010). "Discovery of the 2010 Eruption and the Pre-Eruption Light Curve for Recurrent Nova U Scorpii". The Astronomical Journal. 140 (4): 925–932. arXiv:1004.2842. Bibcode:2010AJ....140..925S. doi:10.1088/0004-6256/140/4/925. S2CID 118394042. Retrieved 12 February 2015.
  9. ^ a b Matthew Templeton (May 6, 2010). "Long-term monitoring of the recurrent nova U Scorpii". AAVSO. Retrieved 2010-11-15.
  10. ^ Templeton, Matthew. "U Scorpii | aavso". www.aavso.org. Retrieved 2022-05-28.
  11. ^ "Eloge: Helen Meriwether Lewis Thomas, 21 August 1905-6 August 1997". Isis. 89 (2): 316–317. 1998-06-01. doi:10.1086/384004. ISSN 0021-1753. S2CID 144636725.
Allikas: http://en.wikipedia.org/wiki/U_Scorpii
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