HIP 12961
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (January 2021) |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 46m 42.89s[1] |
| Declination | −23° 05′ 11.8″[1] |
| Apparent magnitude (V) | 9.7 |
| Characteristics | |
| Spectral type | M0V |
| Apparent magnitude (B) | 11.3 |
| Apparent magnitude (J) | 7.558 |
| Apparent magnitude (H) | 6.927 |
| Apparent magnitude (K) | 6.736 |
| B−V color index | 1.6 |
| Astrometry | |
| Proper motion (μ) | RA: 292.62 ± 1.60[1] mas/yr Dec.: 140.88 ± 1.40[1] mas/yr |
| Parallax (π) | 43.45 ± 1.72 mas[1] |
| Distance | 75 ± 3 ly (23.0 ± 0.9 pc) |
| Absolute magnitude (MV) | 7.8 |
| Details | |
| Mass | 0.63 M☉ |
| Radius | 0.68 ± 0.03 R☉ |
| Luminosity | 0.101 ± 0.01 L☉ |
| Surface gravity (log g) | 4.34 cgs |
| Temperature | 3,838 ± 19[2] K |
| Metallicity [Fe/H] | +0.10±0.06[3] dex |
| Other designations | |
Koeia, TYC 6434-00494-1, CD-23 1056, LTT 1349, 2MASS J02464286-2305119, NLTT 8966, PPM 245393, SAO 168043 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HIP 12961 is a dim red dwarf star located approximately 75 light-years away[1] in the constellation of Eridanus. It is one of the largest and brightest M class red dwarf stars known. In 2009 an extrasolar planet orbiting this faint star has been announced.
HIP 12961 is named Koeia. The name was selected in the NameExoWorlds campaign by Puerto Rico, during the 100th anniversary of the IAU. Koeia was the word for star in the language of the Taíno Indigenous People of the Caribbean.[4][5]
Planetary system
HIP 12961 b is an extrasolar planet which orbits the star. This planet has at least half the mass of Jupiter and takes over eight weeks to orbit the star at a semimajor axis of approximately 0.25 AU. The planet's existence was announced in a press release in October 2009.
The planet HIP 12961 b is named Aumatex. Aumatex was the god of wind in the mythology of the Taíno Indigenous People of the Caribbean.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥0.35 MJ | 0.25 | 57.435 ± 0.042 | 0.166 ± 0.034 | — | — |
References
- ^ a b c d e f 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. S2CID 18759600. Vizier catalog entry
- ^ Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs" (PDF). The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. S2CID 41902340.
- ^ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604: A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715. S2CID 119216828.
- ^ a b "Approved names". NameExoworlds. Retrieved 2020-01-02.
- ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
- ^ Forveille, T.; et al. (2011). "The HARPS search for southern extrasolar planets XXVI. Two giant planets around M0 dwarfs". Astronomy and Astrophysics. 526. A141. arXiv:1012.1168. Bibcode:2011A&A...526A.141F. doi:10.1051/0004-6361/201016034. S2CID 119230019.
| Stars |
| ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||||
| Nebulae |
| ||||||||||||
| Galaxies |
| ||||||||||||
| |||||||||||||
| |||||||||||||
 | This article about a red dwarf is a stub. You can help Wikipedia by expanding it. |
 | This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it. |