HD 142
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Phoenix[1] |
| HD 142 A | |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | Script error: No such module "val".[3] |
| HD 142 B | |
| Right ascension | Template:RA[4] |
| Declination | Template:DEC[4] |
| Apparent magnitude (V) | +11.5[5] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F7V[6] + K8.5-M1.5[7] |
| B−V Template:Engvar | Script error: No such module "val".[8] |
| Astrometry | |
| HD 142 A | |
| Radial velocity (Rv) | Script error: No such module "val".[9] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[9] mas/yr Dec.: Script error: No such module "val".[9] mas/yr |
| Parallax (π) | 38.1945±0.0355 mas[9] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[10] |
| HD 142 B | |
| Proper motion (μ) | RA: Script error: No such module "val".[11] mas/yr Dec.: Script error: No such module "val".[11] mas/yr |
| Parallax (π) | 38.2306±0.0349 mas[11] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| HD 142 A | |
| Mass | Script error: No such module "val".[12] Template:Solar mass |
| Radius | Script error: No such module "val".[13] Template:Solar radius |
| Luminosity | 2.9[13] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[12] cgs |
| Temperature | Script error: No such module "val".[12] K |
| Metallicity [Fe/H] | Script error: No such module "val".[12] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[14] km/s |
| Age | Script error: No such module "val".[12] Gyr |
| HD 142 B | |
| Mass | 0.54[15] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| HD 142A: Template:Odlist[16] | |
| HD 142B: Template:Odlist[17] | |
| Database references | |
| SIMBAD | data |
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HD 142 is a wide binary star[5] system in the southern constellation of Phoenix. The main component has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.7.[3] The system is located at a distance of 85.5 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +6 km/s.[18]
The primary component is an F-type main-sequence star with a stellar classification of F7V,[6] which indicates it is undergoing core hydrogen fusion. It is an estimated 2.5 billion years old[12] and is spinning with a projected rotational velocity of 10 km/s.[14] The star has 1.25 times the mass of the Sun[12] and 1.4 times the Sun's radius. It is radiating 2.9 times the luminosity of the Sun from its photosphere[13] at an effective temperature of 6,349 K.[12]
A magnitude 11.5[5] companion star was detected in 1894 making this a binary star system.[19] The binary companion was confirmed to be gravitationally bound in 2007 and determined to be a red dwarf of spectral type K8.5-M1.5[7] with 54% of the Sun's mass.[15] The pair have a projected separation of Script error: No such module "val"..[15]
Planetary system
In 2001, the Anglo-Australian Planet Search team led by Chris Tinney announced the discovery of an extrasolar planet orbiting the primary star.[20][21] An additional linear trend in the radial velocity data was noticed in 2006[22] that could have been due to another planet or to the stellar companion.[23] 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, but with a false alarm probability of five percent.[24] Another paper by the same team updated the parameters for b and c but did not mention the possible planet d.[25]
An astrometric measurement of HD 142 b's inclination and true mass was published in 2022 as part of Gaia DR3.[26] Another 2022 study determined the inclination and true mass of planet c, and confirmed the existence of planet d.[27]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet Template:OrbitboxPlanet
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See also
References
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External links
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