HIP 12961

HIP 12961

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Eridanus
Right ascension	02h 46m 42.89s
Declination	−23° 05′ 11.8″
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 mas/yr Dec.: 140.88 ± 1.40 mas/yr
Parallax (π)	43.45 ± 1.72 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 K
Metallicity [Fe/H]	+0.01 ± 0.17 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 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.

The HIP 12961 planetary system

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	—	—