HD 192263 b

HD 192263 b
Extrasolar planet List of extrasolar planets
Parent star
Star HD 192263
Constellation Aquila
Right ascension (α) 20h 13m 59.8451s
Declination (δ) –00° 52′ 00.757″
Distance 64.88 ly
(19.89 pc)
Spectral type K2V
Orbital elements
Semimajor axis (a) 0.15 AU
Periastron (q) 0.15 AU
Apastron (Q) 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.
Detection method Doppler Spectroscopy
(CORALIE)
Discovery site La Silla Observatory
Discovery status Published
Database references
Extrasolar Planets
Encyclopaedia		 data
SIMBAD data

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.

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.[1] Finally, in 2003 the planet was confirmed; the planet is thought to be causing fluctuations in the system's magnetic field, causing visible activity.[2]

Preliminary astrometry in 2001 set its inclination at 179.5;[3] but it is now thought to be inclined according to the star's ecliptic, edge-on to Earth.

References

  1. ^ See, "No Planet at All: Star Fools Astronomers, Who See Spots". Space.com article. http://www.space.com/scienceastronomy/astronomy/planet_problem_020905.html. 
  2. ^ Santos et al.; Udry, S.; Mayor, M.; Naef, D.; Pepe, F.; Queloz, D.; Burki, G.; Cramer, N. et al. (2003). "The CORALIE survey for southern extra-solar planets XI. The return of the giant planet orbiting HD 192263" (abstract). Astronomy and Astrophysics 406: 373–381. arXiv:astro-ph/0305434. Bibcode 2003A&A...406..373S. doi:10.1051/0004-6361:20030776. http://www.edpsciences.org/articles/aa/abs/2003/28/aah4460/aah4460.html. 
  3. ^ Han et al.; 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. http://www.iop.org/EJ/article/1538-4357/548/1/L57/005774.html. 

External links

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