HD 9986
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 37m 40.8790s[1] |
| Declination | +12° 04′ 42.171″[1] |
| Apparent magnitude (V) | 6.77[2] |
| Characteristics | |
| Spectral type | G5 V[3] |
| B−V color index | 0.648±0.008[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.01±0.01[4] km/s |
| Proper motion (μ) | RA: +120.433[1] mas/yr Dec.: +6.118[1] mas/yr |
| Parallax (π) | 39.60 ± 0.22[1] mas |
| Distance | 82.4 ± 0.5 ly (25.3 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.73[2] |
| Details[5] | |
| Mass | 1.02[3] M☉ |
| Luminosity | 1.19[2] L☉ |
| Surface gravity (log g) | 4.43±0.01 cgs |
| Temperature | 5,831±5 K |
| Metallicity [Fe/H] | +0.095±0.005 dex |
| Rotational velocity (v sin i) | 1.90±0.15 km/s |
| Age | 3.29±0.51 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 9986 is a Sun-like star 82 light years (25 parsecs) from the Sun. HD 9986 is a G-type star and a near solar twin. A speckle survey of G-dwarfs by Elliott P. Horch in 2002 noted that HD 9986 may not be non-single star.[7]
References
- 1 2 3 4 5 Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.
- 1 2 3 4 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.
- 1 2 "Stellar magnetism: empirical trends with age and rotation" (PDF). Royal Astronomical Society. Cornell University - Astronomy & Astrophysics manuscript. Retrieved July 13, 2016.
- ↑ Soubiran, C.; et al. (April 2013). "The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release". Astronomy & Astrophysics. 552: 11. arXiv:1302.1905. Bibcode:2013A&A...552A..64S. doi:10.1051/0004-6361/201220927. A64.
- ↑ 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, A156.
- ↑ "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. pp. 2048–2059. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. Missing or empty
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