Epsilon Geminorum
Epsilon Geminorum or ε Geminorum, formally named Mebsuta /mɛbˈsuːtə/, is a star in the constellation of Gemini, on the outstretched right 'leg' of the twin Castor. The apparent visual magnitude of +3.06 makes it one of the brighter stars in this constellation. The distance to this star can be determined by parallax measurements, giving a value of 840 light-years (260 parsecs), with a margin of error of 40 ly (12 pc).
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 43m 55.92626s |
| Declination | +25° 07′ 52.0515″ |
| Apparent magnitude (V) | +3.06 |
| Characteristics | |
| Spectral type | G8 Ib |
| U−B color index | +1.46 |
| B−V color index | +1.40 |
| Astrometry | |
| Radial velocity (Rv) | +8.09 ± 0.14 km/s |
| Proper motion (μ) | RA: –5.57 mas/yr Dec.: −12.36 mas/yr |
| Parallax (π) | 3.86 ± 0.17 mas |
| Distance | 840 ± 40 ly (260 ± 10 pc) |
| Absolute magnitude (MV) | –3.90 |
| Details | |
| Mass | 19.2±0.1 M☉ |
| Radius | 140±35 R☉ |
| Luminosity | 8,500 L☉ |
| Surface gravity (log g) | 0.88±0.05 cgs |
| Temperature | 4,662±36 K |
| Metallicity [Fe/H] | 0.15±0.07 dex |
| Rotational velocity (v sin i) | 8.7±1.0 km/s |
| Age | 8.3±0.1 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.