HD 192263
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| Observation data Equinox 2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 13m 59.85s |
| Declination | -0° 52' 0.76" |
| Apparent magnitude (V) | 8.1 |
| Distance | 64.85 ly (19.89 pc) |
| Spectral type | K2V |
| Other designations | |
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BD-01°3925, HIP 99711
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HD 192263 is an 8th magnitude star in the constellation of Aquila. The spectral type of the star is K2 V, meaning that it is an orange dwarf, a type of star somewhat cooler and less luminous than our Sun. It is not visible to the unaided eye, but with good binoculars or small telescope it should be easy to spot.
Various companions for the star have been reported, but all of them are probably line-of-sight optical components or just spurious observations.
This star lies close to the equator.
In 1999 an extrasolar planet was announced orbiting the star.
[edit] HD 192263 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.15 AU | |
| Eccentricity e: | 0 | |
| Orbital period P: | 24.348 ± 0.005 d | |
| Inclination i: | ?° | |
| Longitude of periastron ω: |
?° | |
| Time of periastron τ: | 2,451,979.28 ± 0.08 JD |
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| Physical characteristics | ||
| Mass: | >0.72 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 1999 | |
| Detection method(s): | ||
| Discoverer(s): | Santos, Mayor, Naef et al. |
|
The planet, designated as HD 192263 b, is a gas giant with a mass at least about three quarters that of Jupiter. It orbits the star in a circular orbit completing one revolution in 24 days or so.
In 2002 the existence of the planet was questioned: The star was observed to have photometric brightness variations that have same period and velocities as the planet. The signal could come from those variations instead of the planet orbiting the star. Finally, in 2003 the planet was confirmed.
[edit] References
- Santos et al. (2000). "The CORALIE survey for Southern extra-solar planets III. A giant planet in orbit around HD 192263". Astronomy and Astrophysics 356: 599-602.
- Vogt et al. (2000). "Six New Planets from the Keck Precision Velocity Survey". The Astrophysical Journal 536: 902-914.
- Henry et al. (2002). "A False Planet around HD 192263". The Astrophysical Journal 577: L111-L114.
- Santos et al. (2003). "The CORALIE survey for southern extra-solar planets XI. The return of the giant planet orbiting HD 192263". Astronomy and Astrophysics 406: 373-381.
[edit] External 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
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