Rho Geminorum
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Gemini |
| ρ Gem A | |
| Right ascension | 07h 29m 06.719s |
| Declination | +31° 47′ 04.38″ |
| Apparent magnitude (V) | 4.2473±0.003 |
| ρ Gem B | |
| Right ascension | 07h 29m 06.0s |
| Declination | +31° 46′ 56″ |
| Apparent magnitude (V) | 12.50 |
| ρ Gem E | |
| Right ascension | 07h 29m 01.769s |
| Declination | +31° 59′ 37.83″ |
| Apparent magnitude (V) | 7.74 |
| Characteristics | |
| ρ Gem A | |
| Spectral type | F1V |
| B−V color index | 0.320±0.012 |
| ρ Gem E | |
| Spectral type | K2.5V |
| B−V color index | 0.923±0.018 |
| Variable type | BY Dra |
| Astrometry | |
| ρ Gem A | |
| Radial velocity (Rv) | −3.70±0.7 km/s |
| Proper motion (μ) | RA: 159.09±0.31 mas/yr Dec.: 193.29±0.18 mas/yr |
| Parallax (π) | 55.41±0.24 mas |
| Distance | 58.9 ± 0.3 ly (18.05 ± 0.08 pc) |
| Absolute magnitude (MV) | 2.9 |
| ρ Gem B | |
| Absolute magnitude (MV) | 10.6 |
| ρ Gem E | |
| Radial velocity (Rv) | −3.95±0.1 km/s |
| Proper motion (μ) | RA: +158.169 mas/yr Dec.: +175.873 mas/yr |
| Parallax (π) | 55.1857±0.0234 mas |
| Distance | 59.10 ± 0.03 ly (18.121 ± 0.008 pc) |
| Absolute magnitude (MV) | 6.5 |
| Details | |
| ρ Gem A | |
| Mass | 1.355±0.013 M☉ |
| Radius | 1.655±0.028 R☉ |
| Luminosity | 5.542±0.089 L☉ |
| Surface gravity (log g) | 4.11±0.03 cgs |
| Temperature | 6,899±63 K |
| Metallicity [Fe/H] | −0.25±0.04 dex |
| Rotational velocity (v sin i) | 59.0±3.0 km/s |
| Age | 2.1±0.2 Gyr |
| ρ Gem E | |
| Mass | 0.77 M☉ |
| Radius | 0.77 R☉ |
| Luminosity | 0.29 L☉ |
| Surface gravity (log g) | 4.71±0.08 cgs |
| Temperature | 4,948±41 K |
| Metallicity [Fe/H] | −0.06±0.08 dex |
| Other designations | |
| ρ Gem AB: 62 Geminorum, BD+32°1562, Gliese 274 | |
| ρ Gem A: HD 58946, HIP 36366, HR 2852 | |
| ρ Gem E: HIP 36357, BD+32°1561, Gliese 273.1, V376 Gem | |
| Database references | |
| ρ Gem A | |
| SIMBAD | data |
| ρ Gem E | |
| SIMBAD | data |
Rho Geminorum (ρ Gem) is a star system that lies 59 light-years away in the constellation of Gemini, about 5 degrees west of Castor. The system consists of a primary bright enough to be seen with the naked eye, a faint secondary which has rarely been observed even professionally, and a distant, somewhat bright tertiary which requires telescopic equipment for observation.