KNOWPIA
WELCOME TO KNOWPIA
HD 9986 
Summary
HD 9986 is a Sun-like star in the equatorial constellation of Pisces. With an apparent visual magnitude of 6.77,[2] 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.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 37m 40.87927s[1] |
| Declination | +12° 04′ 42.1714″[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) | −21.024±0.0006[1] km/s |
| Proper motion (μ) | RA: +120.150[1] mas/yr Dec.: +6.057[1] mas/yr |
| Parallax (π) | 39.2718 ± 0.0405 mas[1] |
| Distance | 83.05 ± 0.09 ly (25.46 ± 0.03 pc) |
| Absolute magnitude (MV) | 4.73[2] |
| Details[4] | |
| Mass | 1.02[3] M☉ |
| Radius | 1.04+0.02 −0.01[1] R☉ |
| Luminosity | 1.103±0.002[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[5] days |
| Rotational velocity (v sin i) | 1.90±0.15 km/s |
| Age | 3.29±0.51 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is a G-type main-sequence star with a stellar classification of G5 V,[3] and is a near solar twin with physical properties very similar to the Sun's. It is around 3.3[4] 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 not be non-single star.[7]
References edit
- ^ a b c d e f g h i 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.
- ^ a b c d 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.
- ^ a b c Vidotto, A. A.; et al. (July 2014). "Stellar magnetism: empirical trends with age and rotation" (PDF). Monthly Notices of the Royal Astronomical Society. 441 (3). Cornell University - Astronomy & Astrophysics manuscript: 2361–2374. arXiv:1404.2733. Bibcode:2014MNRAS.441.2361V. doi:10.1093/mnras/stu728. Retrieved July 13, 2016.
- ^ a b 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.