HD 46588

Location of HD 46588 (circled in red)
Observation data Epoch J2000.0      Equinox ICRS
Constellation	Camelopardalis[1]
A
Right ascension	06h 46m 14.1500s[2]
Declination	+79° 33′ 53.319″[2]
Apparent magnitude (V)	+5.44[1]
B
Right ascension	06h 46m 27.5604s[3]
Declination	+79° 35′ 04.513″[3]
Characteristics
A
Evolutionary stage	main sequence[2]
Spectral type	F7 V[4]
U−B color index	−0.02[5]
B−V color index	+0.53[5]
B
Evolutionary stage	brown dwarf[2]
Spectral type	L9[6]
Astrometry
A
Radial velocity (Rv)	15.30±0.13[2] km/s
Proper motion (μ)	RA: −99.163 mas/yr[2] Dec.: −604.042 mas/yr[2]
Parallax (π)	54.9380±0.0595 mas[2]
Distance	59.37 ± 0.06 ly (18.20 ± 0.02 pc)
Absolute magnitude (MV)	+4.18[1]
Details
A
Mass	1.13+0.03 −0.02[7] M☉
Radius	1.16±0.04[8] R☉
Luminosity	1.82[9] L☉
Surface gravity (log g)	4.40±0.02[7] cgs
Temperature	6,273±91[7] K
Metallicity [Fe/H]	−0.12±0.06[7] dex
Rotation	10.3 d[8]
Rotational velocity (v sin i)	2.50±1.74[8] km/s
Age	1.27+1.65 −0.22[7] Gyr
B
Mass	0.064+0.008 −0.019 M☉
Temperature	1360+50 −80 K
Other designations
23 H. Camelopardalis, AG+79°200, BD+79°212, GC 8711, GJ 240.1, HD 46588, HIP 32439, HR 2401, SAO 5946, WDS J06462+7934[10]
Database references
SIMBAD	A
	B

HD 46588 (HR 2401; Gliese 240.1) is a star with a brown dwarf companion in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.44,^[1] allowing it to be faintly seen with the naked eye. The object is relatively close at a distance of only 59 light-years^[2] but is receding with a heliocentric radial velocity of 15 km/s.^[11]

HD 46588 is an ordinary F-type main-sequence star with a spectral classification of F7 V.^[4] It has 113% the mass of the Sun^[7] and 119% its radius.^[9] It shines at 182% the luminosity of the Sun^[9] from its photosphere at an effective temperature of 6,273 K,^[7] giving it a yellow white glow. Isochronic measurements place HD 46588's age at 1.27 billion years,^[7] but it is poorly constrained. The star's metallicity is 76% that of the Sun^[7] and spins modestly with a projected rotational velocity of 6.63 km/s.^[12]

Due to the star's close proximity to Earth and similarity to the Sun, it has been well studied by astronomers.^[6] A brown dwarf companion, HD 46588 B, was discovered in a WISE survey in 2011, at a distance of 1420 AU from the primary. It has a mass of 67+8
−20 Jupiter masses and a temperature of 1360⁺⁵⁰
₋₈₀ K.^[6] An infrared excess has been discovered around HD 46588, indicating a cold debris disk with a temperature of 60 K.^[13] In addition, a 2022 study detected a candidate planet around the star using the radial velocity method.^[8]

References