S Pegasi
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Star S Pegasi |
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| AladinLite | |||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Pegasus | ||||||||
| Right ascension | 23 h 20 m 33 s | ||||||||
| declination | + 08 ° 55 ′ 8 ″ | ||||||||
| Apparent brightness | 10.5 mag | ||||||||
| Typing | |||||||||
| B − V color index | 1.87 | ||||||||
| Spectral class | M5 Ia | ||||||||
| Variable star type | Mira star | ||||||||
| Astrometry | |||||||||
| Radial velocity | −3.4 km / s | ||||||||
| Visual absolute brightness M vis | 8.50 - 12.80 mag | ||||||||
| Proper movement | |||||||||
| Rec. Share: | −10.16 mas / a | ||||||||
| Dec. portion: | −23.21 mas / a | ||||||||
| Physical Properties | |||||||||
| Dimensions | 15–18 m ☉ | ||||||||
| radius | 580 R ☉ | ||||||||
| Luminosity |
≈10000 L ☉ |
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| Effective temperature | 3720 K | ||||||||
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Other names and catalog entries |
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S Pegasi is a red giant in the constellation Pegasus and with approx. 580 solar radii one of the largest known stars. In addition, there is a pulsation variability, which may be with a fluctuation of the apparent brightness between 6.90 and 13.80. goes hand in hand. The absolute brightness of the object averages 0.81 mag. An exact prognosis about the further development of the red giant can only be made with a certain uncertainty. Due to its large mass, S Pegasi is likely to explode in a Type II supernova in a few million years.