3 Geminorum
From Infogalactic: the planetary knowledge core
 Location of 3 Gem (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 09m 43.98481s[1] |
| Declination | +23° 06′ 48.4677″[1] |
| Apparent magnitude (V) | 5.75[2] |
| Characteristics | |
| Spectral type | B2.5 Ib[3] |
| U−B color index | −0.63[2] |
| B−V color index | +0.21[2] |
| Variable type | α Cyg[4] |
| Astrometry | |
| Radial velocity (Rv) | 16.00 ± 4.3[5] km/s |
| Proper motion (μ) | RA: −0.92 ± 0.75[1] mas/yr Dec.: −2.65 ± 0.49[1] mas/yr |
| Parallax (π) | 0.23 ± 0.88[1] mas |
| Absolute magnitude (MV) | −6.26[6] |
| Details[6] | |
| Mass | 21 M☉ |
| Radius | 36.6 R☉ |
| Luminosity | 129,000 L☉ |
| Surface gravity (log g) | 2.50 cgs |
| Temperature | 18,000 K |
| Rotational velocity (v sin i) | 71 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
3 Geminorum is a blue supergiant star in the constellation Gemini. It was found to be an Alpha Cygni variable in 1998. It varies by a few tenths of a magnitude[4] with a main period of 3.81 days.[7]
References
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