HD 12139
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 59m 35.68295s[1] |
| Declination | 21° 03′ 30.8402″[1] |
| Apparent magnitude (V) | 5.89[2] |
| Characteristics | |
| Spectral type | K0III-IV[2] |
| B−V color index | 1.03[2] |
| Astrometry | |
| Radial velocity (Rv) | -1.97[2] km/s |
| Proper motion (μ) | RA: 140.10[1] mas/yr Dec.: -15.68[1] mas/yr |
| Parallax (π) | 8.34 ± 0.84[1] mas |
| Distance | approx. 390 ly (approx. 120 pc) |
| Absolute magnitude (MV) | 0.50 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
| Database references | |
| SIMBAD | data |
HD 12139 is a double star in the constellation Aries. With an apparent magnitude of 5.89, the stars can be seen by the naked eye under good conditions in rural areas. The system is located approximately 120 parsecs (390 ly) distant, and the brighter star is a red giant, meaning that it has used up its core hydrogen and is expanding.[2]
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry - 1 2 3 4 5 "HR 378". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 22 June 2014.
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