HD 101570
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 11h 40m 53.63379s[1]
Declination −62° 05′ 24.3655″[1]
Apparent magnitude (V) 4.93[2]
Characteristics
Spectral type G3Ib[3]
B−V color index 1.111±0.054[2]
Astrometry
Radial velocity (Rv)+18.04±0.18[1] km/s
Proper motion (μ) RA: −15.493±0.082[1] mas/yr
Dec.: +0.981±0.087[1] mas/yr
Parallax (π)3.0181 ± 0.0777 mas[1]
Distance1,080 ± 30 ly
(331 ± 9 pc)
Absolute magnitude (MV)−2.24[2]
Details
Mass17.0[4] M☉
Radius61.2[5] R☉
Luminosity2,168[4] L☉
Surface gravity (log g)1.86[4] cgs
Temperature4,753[5] K
Rotational velocity (v sin i)21.4±2.1[6] km/s
Other designations
CD−61°3145, GC 16037, HD 101570, HIP 56986, HR 4499, SAO 251535[7]
Database references
SIMBADdata

HD 101570 is a single[8] star in the southern constellation of Centaurus. It has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.93. The star is located at a distance of approximately 1,080 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +18 km/s. It has an absolute magnitude of −2.24.

This is an ageing supergiant star with a stellar classification of G3Ib.[3] Having exhausted the supply of hydrogen at its core, the star has expanded to 61 times the radius of the Sun. It has an abnormally high rate of rotation for its evolutionary state, showing a projected rotational velocity of 21.4 km/s.[9] The star is radiating 1,641 times the luminosity of the Sun from its photosphere at an effective temperature of 4,753 K.

References

  1. ^ a b c d e f 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.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. ^ a b Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  4. ^ a b c Fouesneau, M.; Andrae, R.; Dharmawardena, T.; Rybizki, J.; Bailer-Jones, C. A. L.; Demleitner, M. (2022). "Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE". Astronomy and Astrophysics. 662: A125. arXiv:2201.03252. Bibcode:2022A&A...662A.125F. doi:10.1051/0004-6361/202141828. S2CID 245837778.
  5. ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881.
  6. ^ De Medeiros, J. R.; et al. (November 2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
  7. ^ "HD 101570". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  9. ^ Rodrigues da Silva, R.; et al. (March 2015). "On the Nature of Rapidly Rotating Single Evolved Stars". The Astrophysical Journal. 801 (1): 6. arXiv:1503.03447. Bibcode:2015ApJ...801...54R. doi:10.1088/0004-637X/801/1/54. S2CID 119271718. 54.
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