Groombridge 1618
Location of Groombridge 1618 in the constellation Ursa Major | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 11m 22.13995s |
| Declination | +49° 27′ 15.2510″ |
| Apparent magnitude (V) | +6.60 |
| Characteristics | |
| Spectral type | K7.5 Ve |
| U−B color index | +1.27 |
| B−V color index | +1.34 |
| Variable type | BY Dra, Flare star |
| Astrometry | |
| Radial velocity (Rv) | −26.48±0.12 km/s |
| Proper motion (μ) | RA: −1363.287±0.016 mas/yr Dec.: −505.770±0.020 mas/yr |
| Parallax (π) | 205.3148±0.0224 mas |
| Distance | 15.886 ± 0.002 ly (4.8706 ± 0.0005 pc) |
| Absolute magnitude (MV) | 8.11 |
| Details | |
| Mass | 0.670±0.033 M☉ |
| Radius | 0.605±0.02 R☉ |
| Luminosity (bolometric) | 0.15 L☉ |
| Luminosity (visual, LV) | 0.049 L☉ |
| Habitable zone inner limit | 0.398 au |
| Habitable zone outer limit | 0.755 au |
| Surface gravity (log g) | 4.51; 4.70 cgs |
| Temperature | 3,970 K |
| Metallicity [Fe/H] | –0.03 dex |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 6.6 Gyr |
| Other designations | |
| BD+50° 1725, GJ 380, HD 88230, HIP 49908, SAO 43223, LFT 696, IRAS 10082+4942 | |
| Database references | |
| SIMBAD | data |
Groombridge 1618 is a star in the northern constellation Ursa Major. With an apparent visual magnitude of +6.6, it lies at or below the threshold of stars visible to the naked eye for an average observer. It is relatively close to Earth, at 15.89 light-years (4.87 pc). This is a main sequence star of spectral type K7.5 Ve, having just 67% of the Sun's mass.