HD 102117
HD 102117 or Uklun /ˈʌklən/ is a star in the southern constellation of Centaurus. With an apparent visual magnitude of 7.47, it is too dim to be seen without binoculars or a small telescope. It is located at a distance of approximately 129 light years from the Sun based on parallax. HD 102117 is drifting further away with a radial velocity of +50 km/s, having come to within 43.9 light-years some 692,000 years ago. It has one known planet.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h 44m 50.46084s |
| Declination | –58° 42′ 13.3564″ |
| Apparent magnitude (V) | 7.47 |
| Characteristics | |
| Spectral type | G6V |
| B−V color index | 0.721±0.009 |
| Variable type | Constant |
| Astrometry | |
| Radial velocity (Rv) | +49.64±0.13 km/s |
| Proper motion (μ) | RA: –63.555 mas/yr Dec.: –70.439 mas/yr |
| Parallax (π) | 25.2369 ± 0.0409 mas |
| Distance | 129.2 ± 0.2 ly (39.62 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.48 |
| Details | |
| Mass | 1.37±0.130 M☉ 1.03±0.05 M☉ |
| Radius | 1.27 R☉ |
| Luminosity | 1.54 L☉ |
| Surface gravity (log g) | 4.37±0.06 cgs |
| Temperature | 5,695±44 K |
| Metallicity [Fe/H] | 0.30±0.03 dex |
| Rotational velocity (v sin i) | 0.88±0.5 km/s |
| Age | 5.3±3.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of HD 102117 is G6V, which matches the spectrum of an ordinary G-type main-sequence star. It is roughly five billion years old and is spinning with a projected rotational velocity of 0.9 km/s. The star shows only a low level of chromospheric activity and is photometrically stable, meaning it doesn't vary significantly in brightness. It appears metal-enriched, showing a higher abundance of heavy elements compared to the Sun.