HD 102365
HR 4523 (66 G. Centauri) is a binary star system that is located in the northeastern part of the Centaurus constellation, at a distance of about 30.4 light-years (9.3 parsecs) from the Solar System. The larger member of the system is a G-type star that is smaller than the Sun but of similar mass. It has a common proper motion companion that was discovered by W. J. Luyten in 1960. This M-type star appears to be in a wide orbit around the primary at a current separation of about 211 astronomical units (AU), (or 211 times the separation of the Earth from the Sun). By comparison, Neptune orbits at an average distance of 30 AU.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| HD 102365 A | |
| Right ascension | 11h 46m 31.07253s |
| Declination | −40° 30′ 01.2859″ |
| Apparent magnitude (V) | 4.88 |
| HD 102365 B | |
| Right ascension | 11h 46m 32.68988s |
| Declination | −40° 29′ 47.6048″ |
| Apparent magnitude (V) | 15 |
| Characteristics | |
| Spectral type | G2V + M4V |
| U−B color index | 0.10 |
| B−V color index | 0.67 |
| Astrometry | |
| HD 102365 A | |
| Radial velocity (Rv) | 16.94±0.12 km/s |
| Proper motion (μ) | RA: −1530.971 mas/yr Dec.: +403.287 mas/yr |
| Parallax (π) | 107.3024 ± 0.0873 mas |
| Distance | 30.40 ± 0.02 ly (9.319 ± 0.008 pc) |
| Absolute magnitude (MV) | 5.07 |
| HD 102365 B | |
| Radial velocity (Rv) | 17.23±0.27 km/s |
| Proper motion (μ) | RA: −1534.679 mas/yr Dec.: +381.396 mas/yr |
| Parallax (π) | 107.4237 ± 0.0351 mas |
| Distance | 30.362 ± 0.010 ly (9.309 ± 0.003 pc) |
| Details | |
| A | |
| Mass | 0.889 M☉ |
| Radius | 0.96 R☉ |
| Luminosity | 0.85 L☉ |
| Surface gravity (log g) | 4.51 cgs |
| Temperature | 5,643 K |
| Metallicity [Fe/H] | −0.28 dex |
| Rotational velocity (v sin i) | 0.5 km/s |
| Age | 4.5–5.7 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | A |
| B | |
| ARICNS | data |
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