Astronomy:U Scorpii
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 22m 30.78s[1] |
| Declination | −17° 52′ 42.8″[1] |
| Apparent magnitude (V) | 7.5 Max. 17.6 Min.[2] |
| Characteristics | |
| Spectral type | ? / White Dwarf |
| Variable type | Recurrent nova[2] |
| Astrometry | |
| Radial velocity (Rv) | 65[3] km/s |
| Proper motion (μ) | RA: −0.380±0.202[4] mas/yr Dec.: −7.591±0.144[4] mas/yr |
| Parallax (π) | −0.0945 ± 0.1334[4] mas |
| Distance | 19600+21000 −5300[2] pc |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 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.
- ↑ 2.0 2.1 2.2 Schaefer, Bradley E. (2018). "The distances to Novae as seen by Gaia". Monthly Notices of the Royal Astronomical Society 481 (3): 3033–3051. doi:10.1093/mnras/sty2388. Bibcode: 2018MNRAS.481.3033S.
- ↑ 3.0 3.1 "U Scorpii". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=U+Scorpii.
- ↑ 4.0 4.1 4.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Comprehensive Photometric Histories of All Known Galactic Recurrent Novae, B. Schaefer
- ↑ The 1999 Outburst of the Recurrent Nova U Scorpii, Anupama & Dewangan
- ↑ Thar She Blows! U Scorpii Erupts as Predicted, A. MacRobert
- ↑ B. SchaeferExpression error: Unrecognized word "et". (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. doi:10.1088/0004-6256/140/4/925. Bibcode: 2010AJ....140..925S. http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1004.2842. Retrieved 12 February 2015.
- ↑ 9.0 9.1 Matthew Templeton (May 6, 2010). "Long-term monitoring of the recurrent nova U Scorpii". AAVSO. http://www.aavso.org/long-term-monitoring-recurrent-nova-u-scorpii.
- ↑ Templeton, Matthew. "U Scorpii | aavso". https://www.aavso.org/vsots_usco.
- ↑ "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. https://www.journals.uchicago.edu/doi/abs/10.1086/384004.
External links
- http://www.phys.lsu.edu/dept/people/schaefer.html
- U Scorpii in Outburst
- Long-term monitoring of the recurrent nova U Scorpii (AAVSO 2010 April 9)
- AAVSO: Quick Look View of AAVSO Observations (get recent magnitude estimates for U Sco)
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