HD 192263
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Stern HD 192263 |
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| AladinLite | |||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Eagle | ||||||||||||
| Right ascension | 20 h 13 m 59.85 s | ||||||||||||
| declination | -00 ° 52 ′ 0.8 ″ | ||||||||||||
| Apparent brightness | 7.79 likes | ||||||||||||
| Typing | |||||||||||||
| Known exoplanets | 1 | ||||||||||||
| Spectral class | K0 | ||||||||||||
| Variable star type | BY-Draconis mutable | ||||||||||||
| Astrometry | |||||||||||||
| Radial velocity | (−10.8 ± 0.2) km / s | ||||||||||||
| parallax | (51.77 ± 0.78) mas | ||||||||||||
| distance | (63.0 ± 1.0) ly (19.3 ± 0.3) pc |
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| Visual absolute brightness M vis | +6.4 mag | ||||||||||||
| Proper movement | |||||||||||||
| Rec. Share: | (−61.13 ± 1.21) mas / a | ||||||||||||
| Dec. portion: | (+261.37 ± 0.50) mas / a | ||||||||||||
| Physical Properties | |||||||||||||
| Dimensions | 0.81 M ☉ | ||||||||||||
| radius | 0.75 R ☉ | ||||||||||||
| Effective temperature | approx. 5000 K | ||||||||||||
| Metallicity [Fe / H] | −0.2 | ||||||||||||
| Age | approx. 570 mill. a | ||||||||||||
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Other names and catalog entries |
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HD 192263 is a star of the eighth magnitude class in the constellation Aquila . It is a main sequence star of the spectral class K0. The star is therefore a little cooler and a little less bright than our sun . With very good binoculars and telescopes , the star is easy to see at night. HD 192263 is a BY Draconis variable .
Discoveries by companions of the star were announced again and again, which could not be confirmed in retrospect. The fact that the star is practically on the equatorial plane of the earth may have contributed to this. However, it has been clear since 1999 that at least one planet orbits HD 192263.
HD 192263 b
Main article: HD 192263 b
Since, due to the large number of newly discovered planets, they no longer receive proper names (i.e. not the name of a god like Mars , Jupiter etc., for example), newly discovered objects are numbered alphabetically. Therefore the companion of the star is simply called "b", ie HD 192263 b.
The mass of the companion found is at least three quarters of the mass of Jupiter, its almost circular orbit around the star lasts about 24 days. The distance to the star is about 0.15 AU , which is significantly smaller than the distance between the earth and the sun.
credentials
- Santos et al .: The CORALIE survey for Southern extra-solar planets III. A giant planet in orbit around HD 192263 . In: Astronomy and Astrophysics . 356, 2000, pp. 599-602.
- Vogt et al. : Six New Planets from the Keck Precision Velocity Survey . In: The Astrophysical Journal . 536, No. 2, 2000, pp. 902-914.
- Henry et al. : A False Planet around HD 192263 . In: The Astrophysical Journal . 577, No. 2, 2002, pp. L111 - L114.
- Santos et al .: The CORALIE survey for southern extra-solar planets XI. The return of the giant planet orbiting HD 192263 . In: Astronomy and Astrophysics . 406, 2003, pp. 373-381.
Web links
- SIMBAD star entry , planet entry
- The Extrasolar Planets Encyclopaedia entry
- Extrasolar Visions entry
- A new extrasolar planet around the star HD 192263 - discovery announcement
- The Controversial Planet Around HD 192263
- Don't Take This Extrasolar Planet Off the List Just Yet - Space.com article