Coordinates: Sky map 00h 06m 19.18s, −49° 04′ 30.7″

HD 142

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HD 142
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix[1]
HD 142 A
Right ascension 00h 06m 19.1754s[2]
Declination −49° 04′ 30.6741″[2]
Apparent magnitude (V) 5.711±0.003[3]
HD 142 B
Right ascension 00h 06m 19.1480s[4]
Declination −49° 04′ 34.9177″[4]
Apparent magnitude (V) +11.5[5]
Characteristics
Evolutionary stage main sequence
Spectral type F7V[6] + K8.5-M1.5[7]
B−V color index 0.519±0.011[8]
Astrometry
HD 142 A
Radial velocity (Rv)5.76±0.12[9] km/s
Proper motion (μ) RA: 575.099[9] mas/yr
Dec.: −40.874[9] mas/yr
Parallax (π)38.1945±0.0355 mas[9]
Distance85.39 ± 0.08 ly
(26.18 ± 0.02 pc)
Absolute magnitude (MV)3.66±0.02[10]
HD 142 B
Proper motion (μ) RA: 566.984[11] mas/yr
Dec.: −17.387[11] mas/yr
Parallax (π)38.2306±0.0349 mas[11]
Distance85.31 ± 0.08 ly
(26.16 ± 0.02 pc)
Details
HD 142 A
Mass1.25±0.01[12] M☉
Radius1.41±0.11[13] R☉
Luminosity2.9[13] L☉
Surface gravity (log g)4.45±0.07[12] cgs
Temperature6,349±26[12] K
Metallicity [Fe/H]+0.133±0.020[12] dex
Rotation27.15 days[14]
Rotational velocity (v sin i)9.58±0.74[15] km/s
Age2.50+0.32
−0.28[12] Gyr
HD 142 B
Mass0.643[16] M☉
Radius0.423[16] R☉
Luminosity0.046[16] L☉
Surface gravity (log g)4.99[16] cgs
Temperature4,110[16] K
Other designations
HD 142A: CD−49°14337, HD 142, HIP 522, HR 6, SAO 214963, WDS J00063-4905A[17]
HD 142B: CD−49°14337B, WDS J00063-4905B, NLTT 218, 2MASS J00061919-4904348[18]
Database references
SIMBADdata
B

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.[19]

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.[15] 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.[20] 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.[21] The pair have a projected separation of 120.6 AU.[21]


Planetary system

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In 2001, the Anglo-Australian Planet Search team led by Chris Tinney announced the discovery of an extrasolar planet orbiting the primary star.[22][23] An additional linear trend in the radial velocity data was noticed in 2006[24] that could have been due to another planet or to the stellar companion.[25] 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.[26] Another paper by the same team updated the parameters for b and c but did not mention the possible planet d.[27]

An astrometric measurement of HD 142 b's inclination and true mass was published in 2022 as part of Gaia DR3.[28] Another 2022 study determined the inclination and true mass of planet c, and confirmed the existence of planet d.[29]

The HD 142 A planetary system[28][29]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
d ≥0.260+0.032
−0.036 MJ 		0.474+0.021
−0.023 		108.5±0.1 0.130+0.103
−0.085 		— —
b 7.1±1.0 MJ 1.039+0.046
−0.051 		351.4±0.4 0.158+0.033
−0.030 		59±7° —
c 10.901+1.278
−0.937 MJ 		9.811+0.515
−0.520 		10,159.6+384.8
−321.9 		0.277+0.026
−0.027 		90.374+10.495
−12.319° 		—

See also

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References

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Vizier query form
  2. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
  3. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Vizier catalog entry
  4. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
  5. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  10. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  11. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  12. ^ a b c d e f g h Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  15. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  16. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  17. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  18. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  19. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  20. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  21. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  22. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  23. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  24. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  25. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  26. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  27. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  28. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  29. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
[edit | edit source]
  • Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).


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