HD 87822
HD 87822 is a triple star in the northern constellation of Leo Minor. The inner pair orbit each other with a period of about 18 years.
| 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 | |
| Database references | |
| SIMBAD | data |
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