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 | |
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]
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 | |
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]