HD 9986
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 37m 40.87904s |
| Declination | +12° 04′ 42.1703″ |
| Apparent magnitude (V) | 6.77 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G2 V |
| B−V color index | 0.648±0.008 |
| Astrometry | |
| Radial velocity (Rv) | −20.97±0.13 km/s |
| Proper motion (μ) | RA: +120.372 mas/yr Dec.: +6.15 mas/yr |
| Parallax (π) | 39.3118±0.0303 mas |
| Distance | 82.97 ± 0.06 ly (25.44 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.73 |
| Details | |
| Mass | 0.95 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 1.1 L☉ |
| Surface gravity (log g) | 4.43±0.01 cgs |
| Temperature | 5,831±5 K |
| Metallicity [Fe/H] | +0.095±0.005 dex |
| Rotation | 23 days |
| Rotational velocity (v sin i) | 1.90±0.15 km/s |
| Age | 3.29±0.51 Gyr |
| Other designations | |
| BD+11°207, HD 9986, HIP 7585, SAO 92543 | |
| Database references | |
| SIMBAD | data |
HD 9986 is a Sun-like star in the equatorial constellation of Pisces. With an apparent visual magnitude of 6.77, it lies below the normal limit for visibility with the naked eye. The star is located at a distance of 83 light years from the Sun as determined from parallax measurements, but it is drifting closer with a radial velocity of −21 km/s.
This object is a G-type main-sequence star with a stellar classification of G2 V, and is a near solar twin with physical properties very similar to the Sun's. It is around 3.3 billion years old and is spinning slowly with a rotation period of about 23 days. A speckle survey of G-dwarfs by Elliott P. Horch in 2002 noted that HD 9986 may be a non-single star.
References
- 1 2 3 4 5 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 7 8 9 10 11 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.
- 1 2 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365.
- 1 2 3 4 5 6 dos Santos, Leonardo A.; et al. (August 2016). "The Solar Twin Planet Search. IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars". Astronomy & Astrophysics. 592: 8. arXiv:1606.06214. Bibcode:2016A&A...592A.156D. doi:10.1051/0004-6361/201628558. S2CID 53533614. A156.
- ↑ See, V.; Jardine, M.; Vidotto, A. A.; Donati, J. -F.; Boro Saikia, S.; Fares, R.; Folsom, C. P.; Jeffers, S. V.; Marsden, S. C.; Morin, J.; Petit, P.; BCool Collaboration (February 2018). "The open flux evolution of a solar-mass star on the main sequence". Monthly Notices of the Royal Astronomical Society. 474 (1): 536–546. arXiv:1711.03904. Bibcode:2018MNRAS.474..536S. doi:10.1093/mnras/stx2599.
- ↑ "HD 9986". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 13, 2016.
- ↑ Gray, R. O.; et al. (October 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048–2059. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. S2CID 119417105.
