HD 192263 b

HD 192263 b
Exoplanet List of exoplanets
Parent star
Star HD 192263
Constellation Aquila
Right ascension (α) 20h 13m 59.8451s
Declination (δ) –00° 52′ 00.757″
Distance64.88 ly
(19.89 pc)
Spectral type K2V
Orbital elements
Semi-major axis(a) 0.15 AU
Eccentricity (e) 0
Orbital period(P) 24.348 ± 0.005 d
(0.066661 y)
Orbital speed (υ) 67.2 km/s
Argument of
periastron		 (ω) 0°
Time of periastron (T0) 2,451,979.28 ± 0.08 JD
Semi-amplitude (K) 51.9 ± 2.6 m/s
Physical characteristics
Minimum mass(m sin i)0.75 MJ
Discovery information
Discovery date September 28th, 1999
Discoverer(s) Santos, Mayor,
Naef et al.[1]
Discovery method Doppler Spectroscopy
(CORALIE)
Discovery site La Silla Observatory
Discovery status Published[1]
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HD 192263 b is a gas giant planet with a mass about three quarters that of Jupiter mass. It orbits the star in a circular orbit completing one revolution in 24 days or so. It was discovered in 2000 by the Geneva Extrasolar Planet Search team.[1]

In 2002 the existence of the planet was questioned by G. Henry: 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 or suggests that rotational modulation of the visibility of stellar surface activity is the source of the observed radial velocity variations.[2] Finally, in 2003 the planet was confirmed; the planet is thought to be causing fluctuations in the system's magnetic field, causing visible activity.[3]

Preliminary astrometry in 2001 set its inclination at 179.5°;[4] but it is now thought to be inclined according to the star's ecliptic, edge-on to Earth.

References

  1. 1 2 3 Santos, N. C.; 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. Bibcode:2000A&A...356..599S.
  2. ↑ See, "No Planet at All: Star Fools Astronomers, Who See Spots". Space.com article. External link in |work= (help)
  3. ↑ Santos, N. C.; 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 (1): 373–381. arXiv:astro-ph/0305434. Bibcode:2003A&A...406..373S. doi:10.1051/0004-6361:20030776.
  4. ↑ Han; Black, David C.; Gatewood, George (2001). "Preliminary Astrometric Masses for Proposed Extrasolar Planetary Companions". The Astrophysical Journal Letters 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927.

External links

Coordinates: 20h 13m 59.8451s, −00° 52′ 00.757″


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