HD 87822

HD 87822
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo Minor
	AB
Right ascension	10h 08m 15.88717s
Declination	+31° 36′ 14.5875″
Apparent magnitude (V)	6.240 (6.90 + 7.20)
	C
Right ascension	10h 08m 16.16565s
Declination	+31° 35′ 47.1421″
Apparent magnitude (V)	13.8
Characteristics
AB
Spectral type	F4V
U−B color index	+0.01
B−V color index	+0.445
C
Spectral type	dMs1.5
Astrometry
AB
Radial velocity (Rv)	−8.0 km/s
Proper motion (μ)	RA: −80.47 mas/yr ; Dec.: −92.07 mas/yr
Parallax (π)	16.33 ± 0.42 mas
Distance	200 ± 5 ly ; (61 ± 2 pc)
Absolute magnitude (MV)	2.23
C
Radial velocity (Rv)	−5.77 km/s
Proper motion (μ)	RA: −80.484 mas/yr ; Dec.: −87.851 mas/yr
Parallax (π)	16.0212 ± 0.0186 mas
Distance	203.6 ± 0.2 ly ; (62.42 ± 0.07 pc)
Orbit
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 M☉
Surface gravity (log g)	4.18 cgs
Temperature	6,533 K
Metallicity [Fe/H]	0.10 dex
Rotational velocity (v sin i)	8 km/s
Age	1.6 Gyr
B
Mass	1.38 M☉
C
Mass	0.53 M☉
Radius	0.53 R☉
Luminosity	0.04 L☉
Surface gravity (log g)	4.71 cgs
Temperature	3,610 K
Metallicity [Fe/H]	−0.31 dex
Other designations
	BD+32°1982, HD 87822, HIP 49658, HR 3979, SAO 61882.
Database references
SIMBAD	data

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]

References

[10]

[3]

[1]

[2]

[4]

[5]

[6]

[7]

[8]

[9]

[11]

[12]

Observation data Epoch J2000 Equinox J2000
Constellation	Leo Minor
AB
Right ascension	10^h 08^m 15.88717^s^[1]
Declination	+31° 36′ 14.5875″^[1]
Apparent magnitude (V)	6.240^[2] (6.90 + 7.20)^[3]
C
Right ascension	10^h 08^m 16.16565^s^[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 (R_v)	−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 (M_V)	2.23^[2]
C
Radial velocity (R_v)	−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