HIP 12961

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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
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
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
Distance75 ± 3 ly
(23.0 ± 0.9 pc)
Absolute magnitude (MV)7.8
Mass0.63 M
Radius0.68 ± 0.03 R
Luminosity0.101 ± 0.01 L
Surface gravity (log g)4.34 cgs
Temperature3,838 ± 19[2] K
Metallicity [Fe/H]+0.10±0.06[3] dex
Other designations
TYC 6434-00494-1, CD-23 1056, LTT 1349, 2MASS J02464286-2305119, NLTT 8966, PPM 245393, SAO 168043
Database references
Exoplanet Archivedata
Extrasolar Planets

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[edit]

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 HIP 12961 planetary system[4]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b ≥0.35 MJ 0.25 57.435 ± 0.042 0.166 ± 0.034


  1. ^ 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. Vizier catalog entry
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.