HIP 72217
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Apparentmagnitude(V)6.43±0.01[3]
(7.06 + 7.33)[1]
(7.06 + 7.33)[1]
Apparentmagnitude(V)16.82[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra[1] |
| AB | |
| Right ascension | 14h 46m 10.811s[2] |
| Declination | −21° 10′ 35.05″[2] |
| Apparent magnitude (V) | 6.43±0.01[3] (7.06 + 7.33)[1] |
| C | |
| Right ascension | 14h 46m 11.349s[4] |
| Declination | −21° 10′ 36.04″[4] |
| Apparent magnitude (V) | 16.82[1] |
| Characteristics | |
| Evolutionary stage | subgiant + subgiant + main sequence[1] |
| Spectral type | G1V[5] |
| B−V color index | 0.603[1] |
| Astrometry | |
| AB | |
| Radial velocity (Rv) | −1.9±0.4[6] km/s |
| Proper motion (μ) | RA: −57.28 mas/yr[7] Dec.: −101.60 mas/yr[7] |
| Parallax (π) | 24.24±0.63 mas[7] |
| Distance | 135 ± 3 ly (41 ± 1 pc) |
| Absolute magnitude (MV) | +3.35[8] |
| C | |
| Proper motion (μ) | RA: −71.95 mas/yr[4] Dec.: −108.23 mas/yr[4] |
| Parallax (π) | 24.8360±0.1337 mas[4] |
| Distance | 131.3 ± 0.7 ly (40.3 ± 0.2 pc) |
| Orbit[1] | |
| Primary | A |
| Companion | B |
| Period (P) | 12.9170±0.0012 years |
| Semi-major axis (a) | 0.1854±0.0003" (7.65 au[a]) |
| Eccentricity (e) | 0.6319±0.0012 |
| Inclination (i) | 25.29±0.31° |
| Longitude of the node (Ω) | 277.42±0.96° |
| Periastron epoch (T) | 1995.2607±0.0022 |
| Argument of periastron (ω) (secondary) | 44.42±0.91° |
| Semi-amplitude (K1) (primary) | 7.06±0.00 km/s |
| Semi-amplitude (K2) (secondary) | 7.32±0.00 km/s |
| Details[1] | |
| A | |
| Mass | 1.14±0.15 M☉ |
| Radius | 1.47±0.04 R☉ |
| Luminosity | 2.73±0.19 L☉ |
| Habitable zone inner limit | 1.223 au |
| Habitable zone outer limit | 2.847 au |
| Surface gravity (log g) | 4.14±0.11 cgs |
| Temperature | 6,125±50 K |
| Age | 3.55±0.30 Gyr |
| B | |
| Mass | 1.12±0.14 M☉ |
| Radius | 1.39±0.03 R☉ |
| Luminosity | 2.21±0.14 L☉ |
| Habitable zone inner limit | 1.108 au |
| Habitable zone outer limit | 2.599 au |
| Surface gravity (log g) | 4.20±0.12 cgs |
| Temperature | 5,950±50 K |
| Age | 3.55±0.30 Gyr |
| C | |
| Mass | 0.17±0.01 M☉ |
| Radius | 0.28±0.01 R☉ |
| Luminosity | 0.0070±0.0002 L☉ |
| Surface gravity (log g) | 4.76±0.17 cgs |
| Temperature | 3,250±50 K |
| Age | 3.55±0.30 Gyr |
| Other designations | |
| BD−20°4087, HD 129980, HIP 72217, HR 5504, TYC 6166-454-1[9] | |
| Database references | |
| SIMBAD | data |
| C | |
HIP 72217 is a triple star system in the constellation Libra. With an apparent visual magnitude of 6.43, it is very close to the limit for naked eye vision, and thus can only be seen in dark skies. Based on parallax measurements, it lies at a distance of roughly 130 light-years (40 parsecs).
