V391 Pegasi
Star V391 Pegasi |
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AladinLite | |||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Pegasus | ||||
Right ascension | 22 h 04 m 12.1 s | ||||
declination | + 26 ° 25 ′ 7.8 ″ | ||||
Apparent brightness | 14.57 mag | ||||
Typing | |||||
Known exoplanets | 1 | ||||
B − V color index | −0.22 | ||||
U − B color index | −1.00 | ||||
Spectral class | sdB | ||||
Variable star type | Yes | ||||
Astrometry | |||||
parallax | (0.81 ± 0.05) mas | ||||
distance | (4000 ± 300) ly (1240 ± 80) pc |
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Visual absolute brightness M vis | +3.88 mag | ||||
Proper movement | |||||
Rec. Share: | (−4.82 ± 0.10) mas / a | ||||
Dec. portion: | (−3.80 ± 0.09) mas / a | ||||
Physical Properties | |||||
Dimensions | 0.5 (± 0.05) M ☉ | ||||
radius | 0.23 (± 0.03) R ☉ | ||||
Luminosity |
34 L ☉ |
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Effective temperature | 29300 (± 500) K | ||||
Age | > 10 billion a | ||||
Other names and catalog entries |
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V391 Pegasi is a hot subdwarf in the constellation Pegasus, about 4000 light-years from Earth . Its mutable type is V361 Hya .
In 2007 Roberto Silvotti discovered an exoplanet orbiting this star. This is called V391 Pegasi b . A current work from 2018 by the same group questions this. An upcoming evaluation of the TESS data could help to confirm or reject the exoplanet.
Web links
Individual evidence
- ↑ a b c d V391 Peg. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on November 12, 2018 .
- ↑ a b c d e Exoplanet.eu
- ↑ a b c d e R. Silvotti et. al: The sdB pulsating star V391 Peg and its putative giant planet revisited after 13 years of time-series photometric data . In: Astronomy & Astrophysics . 611, 2018. arxiv : 1711.10942 . doi : 10.1051 / 0004-6361 / 201731473 .
- ↑ VSX
- ↑ Planet survives stellar explosion. Nature , September 12, 2007, accessed June 29, 2018 .