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The position of Epsilon Pegasi in the Pegasus constellation. |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Pegasus |
| Right ascension | 21h 44m 11.158s[1] |
| Declination | +09° 52′ 30.04″[1] |
| Apparent magnitude (V) | 2.404[1] |
| Characteristics | |
| Spectral type | K2 Ib[1] |
| U−B color index | 1.7 |
| B−V color index | 1.52 |
| Variable type | LC[2] |
| Astrometry | |
| Radial velocity (Rv) | 3.39 ±0.06[1] km/s |
| Proper motion (μ) | RA: 30.02 ±1.13[1] mas/yr Dec.: 1.38 ±0.47[1] mas/yr |
| Parallax (π) | 4.85 ± 0.84 mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Absolute magnitude (MV) | -4.19 |
| Details | |
| Mass | 10-11 M☉ |
| Radius | 150 R☉ |
| Luminosity | 6,700 L☉ |
| Temperature | 4,460 K |
| Rotation | <17 km/s. |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Pegasi (ε Peg, ε Pegasi) is the brightest star in the constellation Pegasus. It has the traditional name Enif. The name "Enif" is derived from the Arabic word for nose, due to its position as the muzzle of Pegasus.
In Chinese, 危宿 (Wēi Sù), meaning Rooftop (asterism), refers to an asterism consisting of ε Pegasi, α Aquarii and θ Peg.[3] Consequently, ε Pegasi itself is known as 危宿三 (Wēi Sù sān, English: the Third Star of Rooftop.)[4]
It is fairly average for an orange supergiant star, well into the later stages of its stellar evolution and as such may be considered a dying star. Enif probably only has a few million years left to go, although it is unknown whether it will explode in a supernova or die off as a rare neon-oxygen white dwarf, due to its mass straddling the dividing line between stars destined to explode or not. Enif has been observed to brighten radically upon a few occasions, giving rise to the theory that it (and possibly other supergiants) erupt in massive flares that dwarf those of our own Sun. It is a type LC slow irregular variable star that varies from +0.7 to +3.5 in magnitude.[2]
Coordinates: 21h 44m 11.158s, +09° 52′ 30.04″
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