HD 87822

HD 87822 is a triple star in the northern constellation of Leo Minor.^[10] The inner pair orbit each other with a period of about 18 years.^[3]

HD 87822

Observation data Epoch J2000      Equinox J2000
Constellation	Leo Minor
AB
Right ascension	10h 08m 15.88717s[1]
Declination	+31° 36′ 14.5875″[1]
Apparent magnitude (V)	6.240[2] (6.90 + 7.20)[3]
C
Right ascension	10h 08m 16.16565s[4]
Declination	+31° 35′ 47.1421″[4]
Apparent magnitude (V)	13.8[5]
Characteristics
AB
Spectral type	F4V[6]
U−B color index	+0.01[7]
B−V color index	+0.445[7]
C
Spectral type	dMs1.5[8]
Astrometry
AB
Radial velocity (Rv)	−8.0[2] km/s
Proper motion (μ)	RA: −80.47[1] mas/yr Dec.: −92.07[1] mas/yr
Parallax (π)	16.33±0.42 mas[1]
Distance	200 ± 5 ly (61 ± 2 pc)
Absolute magnitude (MV)	2.23[2]
C
Radial velocity (Rv)	−5.77[4] km/s
Proper motion (μ)	RA: −80.484[4] mas/yr Dec.: −87.851[4] mas/yr
Parallax (π)	16.0212±0.0186 mas[4]
Distance	203.6 ± 0.2 ly (62.42 ± 0.07 pc)
Orbit[9]
Primary	A
Companion	B
Period (P)	17.765±0.036 yr
Semi-major axis (a)	0.1560±0.0005″
Eccentricity (e)	0.3960±0.0038
Inclination (i)	84.59±0.20°
Longitude of the node (Ω)	349.57±0.15°
Periastron epoch (T)	B 1989.133±0.042
Argument of periastron (ω) (secondary)	7.73±0.95°
Details
A
Mass	1.45[10] M☉
Surface gravity (log g)	4.18[6] cgs
Temperature	6,533[6] K
Metallicity [Fe/H]	0.10[6] dex
Rotational velocity (v sin i)	8[11] km/s
Age	1.6[2] Gyr
B
Mass	1.38[10] M☉
C
Mass	0.53[10] M☉
Radius	0.53[5] R☉
Luminosity	0.04[5] L☉
Surface gravity (log g)	4.71[5] cgs
Temperature	3,610[5] K
Metallicity [Fe/H]	−0.31[12] dex
Other designations
BD+32°1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBAD	data