HD 89571

HD 89571 (HR 4062) is a binary star^[12] located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with a combined apparent magnitude of 5.51^[3] and is estimated to be 142 light years^[2] away from the Solar System. However, it is receding with a heliocentric radial velocity of 3.5 km/s.^[5]

HD 89571

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis[1]
Right ascension	10h 29m 41.6297s[2]
Declination	+84° 15′ 06.949″[2]
Apparent magnitude (V)	5.51±0.01[3]
Characteristics
Spectral type	A9 V[4]
U−B color index	+0.06[3]
B−V color index	+0.23[3]
Astrometry
Radial velocity (Rv)	3.5±2[5] km/s
Proper motion (μ)	RA: −145.145 mas/yr[2] Dec.: −21.494 mas/yr[2]
Parallax (π)	23.0490±0.3729 mas[2]
Distance	142 ± 2 ly (43.4 ± 0.7 pc)
Absolute magnitude (MV)	+2.48[1]
Orbit[6]
Primary	A
Companion	B
Period (P)	2.20±0.03 yr
Semi-major axis (a)	0.0142±0.0006″
Eccentricity (e)	0.26±0.11
Details
A
Mass	1.69[7] M☉
Radius	1.79[2] R☉
Luminosity	8.4[8] L☉
Surface gravity (log g)	4.27[9] cgs
Temperature	7,535[10] K
Metallicity [Fe/H]	+0.04[11] dex
Rotational velocity (v sin i)	134±7[10] km/s
Age	710[7] Myr
B
Mass	0.38[7] M☉
Other designations
AG+84°229, BD+84°234, GC 14305, HD 89571, HIP 51384, HR 4062, SAO 1701, WDS J10297+8415AB
Database references
SIMBAD	data

The primary has a stellar classification of A9 V,^[4] indicating that it is an ordinary A-type main-sequence star. David S. Evans gave it a slightly warmer class of A6 V^[13] while Cowley et al. classified it as F0 IV,^[14] indicating a F-type subgiant. Nevertheless, the two components take roughly 2 years to orbit each other at a mean separation of 14.2 mas.^[6]

The components have masses of 1.69 M_☉ and 0.38 M_☉,^[7] with the latter being a probable M-type star. HD 89571 has a radius of 1.79 R_☉^[2] and a luminosity of 8.4 L_☉.^[8] This yields an effective temperature of 7,535 K,^[10] giving a white hue. It is estimated to be 710 million years old^[7] and spins rapidly with a projected rotational velocity of 134 km/s;^[10] it has a near solar metallicity, equating to an iron abundance 110% that of the Sun.^[11]