Groombridge 1830
Groombridge 1830 (circled in red) in Ursa Major | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 52m 58.76734s |
| Declination | +37° 43′ 07.2541″ |
| Apparent magnitude (V) | 6.44 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | K1V Fe−1.5 |
| U−B color index | +0.16 |
| B−V color index | +0.75 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | −98.05±0.12 km/s |
| Proper motion (μ) | RA: +4,002.7 mas/yr Dec.: −5,817.8 mas/yr |
| Parallax (π) | 109.0296±0.0197 mas |
| Distance | 29.914 ± 0.005 ly (9.172 ± 0.002 pc) |
| Absolute magnitude (MV) | 6.64 |
| Details | |
| Mass | 0.63±0.02 M☉ |
| Radius | 0.586±0.004 R☉ |
| Luminosity | 0.221±0.005 L☉ |
| Surface gravity (log g) | 4.702±0.015 cgs |
| Temperature | 5,174±32 K |
| Metallicity [Fe/H] | −1.26±0.07 dex |
| Rotation | 32.2 |
| Rotational velocity (v sin i) | 0.5 km/s |
| Age | 4.7–5.3 Gyr |
| Other designations | |
| Groombridge 1830, Argelander's Star, CF UMa, BD+38 2285, FK5 1307, GJ 451, HD 103095, HIP 57939, HR 4550, SAO 62738, LHS 44, LTT 13276, PLX 2745 | |
| Database references | |
| SIMBAD | data |
Groombridge 1830 is a star 29.9 light-years away in the constellation Ursa Major. With an apparent magnitude of 6.4, it is near the limit of naked eye visibility under ideal conditions. It has a low metallicity and is thought to be a superflare star.