HD 142
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Phoenix[1] |
| Right ascension | 00h 06m 19.18s[2] |
| Declination | –49° 04′ 30.7″[2] |
| Apparent magnitude (V) | 5.711 ± 0.003[3] |
| Characteristics | |
| Spectral type | F7 V[4] |
| Astrometry | |
| Proper motion (μ) | RA: 575.29 ± 0.33[2] mas/yr Dec.: –39.19 ± 0.34[2] mas/yr |
| Parallax (π) | 38.89 ± 0.37[2] mas |
| Distance | 83.9 ± 0.8 ly (25.7 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.66 ± 0.02[5] |
| Details | |
| Mass | 1.25 ± 0.10[6] M☉ |
| Radius | 1.41 ± 0.11[6] R☉ |
| Luminosity | 2.9[6] L☉ |
| Surface gravity (log g) | 4.34 ± 0.14[6] cgs |
| Temperature | 6,338 ± 46[6] K |
| Metallicity [Fe/H] | 0.03 ± 0.04[6] dex |
| Age | 2.5[6] Gyr |
| Other designations | |
HD 142 is a 6th magnitude yellow-white dwarf star approximately 84 light years away[2] in the constellation of Phoenix. A companion star was detected in 1894 making this a binary star system.[8] The binary companion was confirmed in 2007 and determined to be of spectral type K8.5-M1.5 with a mass 59% that of the sun.[9]
Planetary system
In 2001, the Anglo-Australian Planet Search team led by Chris Tinney announced the discovery of an extrasolar planet orbiting the star.[10][11] An additional linear trend in the radial velocity data was noticed in 2006[12] that could have been due to another planet or to the stellar companion.[13] In 2012, additional measurements allowed the detection of a second planet. A third possible planet with a period of 108 days was seen in the data however the false alarm probability was five percent.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| d (unconfirmed) | 0.30 MJ | 0.469 | 108.39 | 0.12 | — | — |
| b | 1.25 ± 0.15 MJ | 1.02 ± 0.03 | 349.7 ± 1.2 | 0.17 ± 0.06 | — | — |
| c | 5.3 ± 0.7 MJ | 6.8 ± 0.5 | 6005 ± 477 | 0.21 ± 0.07 | — | — |
See also
References
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Coordinates: 
00h 06m 19.18s, −49° 04′ 30.7″
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