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| 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 |
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.
- ^ a b c d e f g h Cite error: The named reference
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- ^ a b Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". Astronomy and Astrophysics Supplement Series. 124 (1): 75–84. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181. ISSN 0365-0138.
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- ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: 02025. Bibcode:2009yCat....102025S.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
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