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Rho Geminorum
Star system in the constellation Gemini / From Wikipedia, the free encyclopedia
Not to be confused with R Geminorum.
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.
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Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Apparent magnitude (V) ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Gemini |
ρ Gem A | |
Right ascension | 07h 29m 06.719s[1] |
Declination | +31° 47′ 04.38″[1] |
Apparent magnitude (V) | 4.2473±0.003[1] |
ρ Gem B | |
Right ascension | 07h 29m 06.0s[2] |
Declination | +31° 46′ 56″[2] |
Apparent magnitude (V) | 12.50[3] |
ρ Gem E | |
Right ascension | 07h 29m 01.769s[4] |
Declination | +31° 59′ 37.83″[4] |
Apparent magnitude (V) | 7.74[3] |
Characteristics | |
ρ Gem A | |
Spectral type | F1V[5] |
B−V color index | 0.320±0.012[1] |
ρ Gem E | |
Spectral type | K2.5V[5] |
B−V color index | 0.923±0.018[1] |
Variable type | BY Dra[6] |
Astrometry | |
ρ Gem A | |
Radial velocity (Rv) | −3.70±0.7[7] km/s |
Proper motion (μ) | RA: 159.09±0.31[1] mas/yr Dec.: 193.29±0.18[1] mas/yr |
Parallax (π) | 55.41 ± 0.24 mas[1] |
Distance | 58.9 ± 0.3 ly (18.05 ± 0.08 pc) |
Absolute magnitude (MV) | 2.9[8] |
ρ Gem B | |
Absolute magnitude (MV) | 10.6[8] |
ρ Gem E | |
Radial velocity (Rv) | −3.95±0.1[9] km/s |
Proper motion (μ) | RA: +158.169[4] mas/yr Dec.: +175.873[4] mas/yr |
Parallax (π) | 55.1857 ± 0.0234 mas[4] |
Distance | 59.10 ± 0.03 ly (18.121 ± 0.008 pc) |
Absolute magnitude (MV) | 6.5[8] |
Details | |
ρ Gem A | |
Mass | 1.355±0.013[10] M☉ |
Radius | 1.655±0.028[10] R☉ |
Luminosity | 5.542±0.089[10] L☉ |
Surface gravity (log g) | 4.11±0.03[11] cgs |
Temperature | 6,899±63[10] K |
Metallicity [Fe/H] | −0.25±0.04[11] dex |
Rotational velocity (v sin i) | 59.0±3.0[12] km/s |
Age | 2.1±0.2[10] Gyr |
ρ Gem E | |
Mass | 0.77[13] M☉ |
Radius | 0.77[4] R☉ |
Luminosity | 0.29[4] L☉ |
Surface gravity (log g) | 4.71±0.08[11] cgs |
Temperature | 4,948±41[11] K |
Metallicity [Fe/H] | −0.06±0.08[11] 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 |
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