HIP 12961
| 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[1] mas |
| 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] | +0.01 ± 0.17[2] dex |
| Other designations | |
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 |
| Extrasolar Planets Encyclopaedia | 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.
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.
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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
- ↑ 2.0 2.1 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". The Astrophysical Journal 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93.
- ↑ 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.
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