Astronomy:HD 12139
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 59m 35.68394s[1] |
| Declination | 21° 03′ 30.8472″[1] |
| Apparent magnitude (V) | 5.89[2] |
| Characteristics | |
| Spectral type | K0III-IV[3] |
| B−V color index | 1.031±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.65±0.20[1] km/s |
| Proper motion (μ) | RA: +141.014[1] mas/yr Dec.: -14.643[1] mas/yr |
| Parallax (π) | 9.3049 ± 0.0967[1] mas |
| Distance | 351 ± 4 ly (107 ± 1 pc) |
| Absolute magnitude (MV) | 0.50[2] |
| Details | |
| Mass | 1.69±0.48[4] M☉ |
| Radius | 11.12+0.34 −0.13[1] R☉ |
| Luminosity | 58.2±0.7[1] L☉ |
| Surface gravity (log g) | 2.50±0.11[4] cgs |
| Temperature | 4,780+120 −70[1] K |
| Metallicity [Fe/H] | −0.02±0.05[4] dex |
| Age | 2.0+1.0 −0.6[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 12139 is an orange-hued star in the northern zodiac constellation of Aries. With an apparent visual magnitude of 5.89, it is a dim star that is just visible to the naked eye under good viewing conditions. It is located approximately 351 light-years (107.5 pc) distant from the Sun, based on parallax,[2] but is drifting closer with a radial velocity of −2 km/s.[1] With high probability, it is considered a member of the Hercules stream.[6]
This object is an aging red giant[7] with a stellar classification of K0III-IV,[3] meaning that it has used up its core hydrogen and is expanding. At present it has 11[1] times the girth of the Sun. The star is about two[4] billion years old with 1.7[4] times the mass of the Sun. It is radiating 58[1] times the luminosity of the Sun from its photosphere at an effective temperature of 4,780 K.[1]
A magnitude 9.36 companion is located at an angular separation of 199.70″ from the primary along a position angle of 9°, as of 2015. It is unclear if the two are physically associated.[8]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 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 2.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Yoss, Kenneth M. (November 1961). "Spectral and Luminosity Classifications and Measurements of the Strength of Cyanogen Absorption for Late-Type Stars from Objective-Prism Spectra". Astrophysical Journal 134: 809. doi:10.1086/147209. Bibcode: 1961ApJ...134..809Y.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Feuillet, Diane K. et al. (2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal 817 (1): 40. doi:10.3847/0004-637X/817/1/40. Bibcode: 2016ApJ...817...40F.
- ↑ "HD 12139". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+12139.
- ↑ Ramya, P. et al. (August 2016). "Chemical compositions and kinematics of the Hercules stream". Monthly Notices of the Royal Astronomical Society 460 (2): 1356−1370. doi:10.1093/mnras/stw852. Bibcode: 2016MNRAS.460.1356R.
- ↑ Takeda, Yoichi; Tajitsu, Akito (2014). "Spectroscopic study on the beryllium abundances of red giant stars". Publications of the Astronomical Society of Japan 66 (5): 91. doi:10.1093/pasj/psu066. Bibcode: 2014PASJ...66...91T.
- ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
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