| 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 ± 0.9 pc) |
| Absolute magnitude (MV) | 7.8 |
| Details | |
| Mass | 0.63 M☉ |
| Radius | 0.68 ± 0.03 R☉ |
| Surface gravity (log g) | 4.34 |
| Luminosity | 0.101 ± 0.01 L☉ |
| Temperature | 3960 ± 100 K |
| Other designations | |
|
TYC 6434-00494-1, CD-23 1056, LTT 1349, 2MASS J02464286-2305119, NLTT 8966, PPM 245393, SAO 168043
|
|
| Database references | |
| SIMBAD | data |
| NStED | 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.
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, but no discovery paper has yet been made available.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | ≥0.35 MJ | 0.25 | 57.435 ± 0.042 | 0.166 ± 0.034 |