GJ 3512
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 08h 41m 20.12866s |
| Declination | +59° 29′ 50.4441″ |
| Apparent magnitude (V) | +15.05 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | dM5.5 |
| Astrometry | |
| Radial velocity (Rv) | +7.13±2.45 km/s |
| Proper motion (μ) | RA: −260.276 mas/yr Dec.: −1,279.562 mas/yr |
| Parallax (π) | 105.2935±0.0313 mas |
| Distance | 30.976 ± 0.009 ly (9.497 ± 0.003 pc) |
| Details | |
| Mass | 0.1254±0.0031 M☉ |
| Radius | 0.1636±0.0023 R☉ |
| Luminosity | 0.001574±0.000018 L☉ |
| Surface gravity (log g) | 5.240±0.044 cgs |
| Temperature | 3,081±51 K |
| Metallicity [Fe/H] | −0.07±0.16 dex |
| Rotation | 87±5 d |
| Rotational velocity (v sin i) | 2.0 km/s |
| Age | 3–8 Gyr |
| Other designations | |
| G 234-45, LHS 252, LP 90-18, 2MASS J08412013+5929505 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
GJ 3512 is a nearby star in the northern circumpolar constellation of Ursa Major. It is invisible to the naked eye but can be observed using a telescope, having an apparent visual magnitude of +15.05. The star is located at a distance of 31 light-years from the Sun based on parallax. It has a high proper motion, traversing the celestial sphere at the rate of 1.311″ yr−1. The measurement of the star's radial velocity is poorly constrained, but it appears to be drifting further away at a rate of ~8 km/s.
The stellar classification of GJ 3512 is dM5.5, which determines this to be a small red dwarf star that is generating energy through core hydrogen fusion. It displays a moderate amount of magnetic activity with a Sun-like cycle lasting 14 years. A low-level variability lasting ~87 d matches the approximate rotation period. The star has 12.5% of the mass of the Sun and 16% of the Sun's radius. It is radiating 1.6% of the luminosity of the Sun from its photosphere at an effective temperature of 3,081 K.