Epsilon Pegasi
Epsilon Pegasi (Latinised from ε Pegasi, abbreviated Epsilon Peg, ε Peg), formally named Enif /ˈiːnɪf/, is the brightest star in the northern constellation of Pegasus.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 44m 11.15614s |
| Declination | +09° 52′ 30.0311″ |
| Apparent magnitude (V) | 2.399 (2.37 - 2.45) |
| Characteristics | |
| Spectral type | K2 Ib-II |
| U−B color index | +1.722 |
| B−V color index | +1.527 |
| Variable type | LC |
| Astrometry | |
| Radial velocity (Rv) | 3.39 ± 0.06 km/s |
| Proper motion (μ) | RA: +26.92 mas/yr Dec.: +0.4 mas/yr |
| Parallax (π) | 4.73 ± 0.17 mas |
| Distance | 690 ± 20 ly (211 ± 8 pc) |
| Absolute magnitude (MV) | –4.142 |
| Details | |
| Mass | 7.07–12 M☉ |
| Radius | 211 R☉ |
| Luminosity | 3,895 L☉ |
| Luminosity (bolometric) | 9,716 - 9,898 L☉ |
| Surface gravity (log g) | 1.01 cgs |
| Temperature | 3,963 - 3,965 K |
| Metallicity [Fe/H] | –0.04 dex |
| Rotational velocity (v sin i) | 8 km/s |
| Age | 20.0 ± 4.5 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
With an average apparent visual magnitude of 2.4, this is a second-magnitude star that is readily visible to the naked eye. The distance to this star can be estimated using parallax measurements from the Hipparcos astrometry satellite, yielding a value of around 690 light-years (210 parsecs).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.