HD 142

HD 142
Observation data
Epoch J2000.0      Equinox J2000.0
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±0.017[9] mas/yr
Dec.: −40.874±0.024[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±0.023[11] mas/yr
Dec.: −17.387±0.027[11] mas/yr
Parallax (π)38.2306 ± 0.0349 mas[11]
Distance85.31 ± 0.08 ly
(26.16 ± 0.02 pc)
Details[12]
HD 142 A
Mass1.25±0.10 M☉
Radius1.41±0.11 R☉
Luminosity2.9 L☉
Surface gravity (log g)4.34±0.14 cgs
Temperature6,338±46 K
Metallicity [Fe/H]0.03±0.04 dex
Rotational velocity (v sin i)9.58±0.74[13] km/s
Age2.5 Gyr
HD 142 B
Mass0.54[14] M☉
Other designations
HD 142A: CD−49°14337, HD 142, HIP 522, HR 6, SAO 214963, WDS J00063-4905A[15]
HD 142B: CD−49°14337B, WDS J00063-4905B, NLTT 218, 2MASS J00061919-4904348[16]
Database references
SIMBADdata

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.[17]

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[12] billion years old and is spinning with a projected rotational velocity of 10 km/s.[13] The star has 1.25 times the mass of the Sun and 1.4 times the Sun's radius. It is radiating 2.9 times the luminosity of the Sun from its photosphere at an effective temperature of 6,338 K.[12]

A magnitude 11.5[5] companion star was detected in 1894 making this a binary star system.[18] 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.[14] The pair have a projected separation of 120.6 AU.[14]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Gaia DR2 A was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Olsen1994 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gaia DR2 B was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Eggenberger2007 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  10. ^ Cite error: The named reference Holmberg was invoked but never defined (see the help page).
  11. ^ a b c Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  12. ^ a b c Cite error: The named reference apj720_2_1290 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Soto2018 was invoked but never defined (see the help page).
  14. ^ a b c Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Simbad for A was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Simbad for B was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Valenti2005 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Raghavan2006 was invoked but never defined (see the help page).