Enif
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Star Enif (ε Pegasi) |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Pegasus | ||||||||||||||||||||
| Right ascension | 21 h 44 m 11.16 s | ||||||||||||||||||||
| declination | + 09 ° 52 ′ 30 ″ | ||||||||||||||||||||
| Apparent brightness | 2.38 (2.37 to 2.45) mag | ||||||||||||||||||||
| Typing | |||||||||||||||||||||
| B − V color index | +1.53 | ||||||||||||||||||||
| U − B color index | +1.70 | ||||||||||||||||||||
| R − I index | +0.76 | ||||||||||||||||||||
| Spectral class | K2 Ib | ||||||||||||||||||||
| Variable star type | LC | ||||||||||||||||||||
| Astrometry | |||||||||||||||||||||
| Radial velocity | (3.4 ± 0.1) km / s | ||||||||||||||||||||
| parallax | (4.73 ± 0.17) mas | ||||||||||||||||||||
| distance | (690 ± 25) ly (211 ± 8) pc |
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| Visual absolute brightness M vis | approx. −4.3 mag | ||||||||||||||||||||
| Proper movement | |||||||||||||||||||||
| Rec. Share: | (26.92 ± 0.18) mas / a | ||||||||||||||||||||
| Dec. portion: | (0.44 ± 0.12) mas / a | ||||||||||||||||||||
| Physical Properties | |||||||||||||||||||||
| Dimensions | 10 M ☉ | ||||||||||||||||||||
| radius | 150 R ☉ | ||||||||||||||||||||
| Luminosity |
6700 L ☉ |
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| Effective temperature | 4460 K | ||||||||||||||||||||
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Other names and catalog entries |
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Enif (from Arabic أنف, DMG anf 'nose (of the horse)') is the name of ε Pegasi (Epsilon Pegasi), the brightest star in the constellation Pegasus . Enif has an apparent magnitude of +2.38 mag. It is an orange-red supergiant of the spectral type K2 and about 700 light years away. In a few million years it should end up as a massive white dwarf or - if it has a little too much mass for this evolutionary path - explode as a supernova . Enif is an irregular variable whose brightness sometimes increases significantly due to enormous eruptions ( flares ). In 1972 the star showed an outbreak of brightness, whereby it became strikingly bright at 0.70 m . Enif is a triple star .
It has two companions: at 82 ″ a +11.5 mag bright star and at 143 ″ a +8.5 mag bright star.
See also
Individual evidence
- ↑ eps peg. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on October 13, 2018 .
- ↑ a b Hipparcos catalog (ESA 1997)
- ↑ a b eps peg. In: VSX. AAVSO, accessed October 13, 2018 .
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ estimated based on the apparent brightness and distance
- ↑ a b c d Enif. Jim Kaler, accessed October 13, 2018 .