HD 142

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.^[16]

Apparentmagnitude(V)5.711±0.003^[3]

Apparentmagnitude(V)+11.5^[5]

Evolutionarystagemain sequence

SpectraltypeF7V^[6] + K8.5-M1.5^[7]

Quick facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...

HD 142

Location of HD 142 (circled in red)
Observation data Epoch J2000      Equinox J2000
Constellation	Phoenix[1]
HD 142 A
Right ascension	00h 06m 19.17532s[2]
Declination	−49° 04′ 30.6712″[2]
Apparent magnitude (V)	5.711±0.003[3]
HD 142 B
Right ascension	00h 06m 19.14790s[4]
Declination	−49° 04′ 34.9098″[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[2] km/s
Proper motion (μ)	RA: +575.099[2] mas/yr Dec.: −40.874[2] mas/yr
Parallax (π)	38.1945±0.0355 mas[2]
Distance	85.39 ± 0.08 ly (26.18 ± 0.02 pc)
HD 142 B
Proper motion (μ)	RA: +566.984[4] mas/yr Dec.: −17.387[4] mas/yr
Parallax (π)	38.2306±0.0349 mas[4]
Distance	85.31 ± 0.08 ly (26.16 ± 0.02 pc)
Details
HD 142 A
Mass	1.25±0.01[9] M☉
Radius	1.41±0.11[10] R☉
Luminosity	2.9[10] L☉
Surface gravity (log g)	4.45±0.07[9] cgs
Temperature	6,349±26[9] K
Metallicity [Fe/H]	+0.133±0.020[9] dex
Rotation	27.15 days[11]
Rotational velocity (v sin i)	9.58±0.74[12] km/s
Age	2.50+0.32 −0.28[9] Gyr
HD 142 B
Mass	0.643[13] M☉
Radius	0.423[13] R☉
Luminosity	0.046[13] L☉
Surface gravity (log g)	4.99[13] cgs
Temperature	4,110[13] K
Other designations
CD−49°14337, HD 142, HIP 522, WDS J00063-4905
HD 142A: HR 6, SAO 214963[14]
HD 142B: NLTT 218, 2MASS J00061919-4904348[15]
Database references
SIMBAD	A
	B
Exoplanet Archive	data
ARICNS	data

Close

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^[9] and is spinning with a projected rotational velocity of 10 km/s.^[12] The star has 1.25 times the mass of the Sun^[9] and 1.4 times the Sun's radius. It is radiating 2.9 times the luminosity of the Sun from its photosphere^[10] at an effective temperature of 6,349 K.^[9]

A magnitude 11.5^[5] companion star was detected in 1894 making this a binary star system.^[17] 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.^[18] The pair have a projected separation of 120.6 AU.^[18]