HD 192263 b

HD 192263 b / Beirut

Discovery
Discovered by	Santos, Mayor, Naef et al.[1]
Discovery site	La Silla Observatory
Discovery date	September 28th, 1999
Detection method	Doppler Spectroscopy (CORALIE)
Orbital characteristics
Semi-major axis	0.15 AU (22,000,000 km)
Eccentricity	0
Orbital period (sidereal)	24.348 ± 0.005 d
Time of periastron	2,451,979.28 ± 0.08
Argument of periastron	0
Semi-amplitude	51.9 ± 2.6
Star	HD 192263

HD 192263 b, also named Beirut, 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] The planet was independently detected by the California and Carnegie Planet Search team.^[2][3]

Naming

The planet HD 192263 b is named Beirut. The name was selected in the NameExoWorlds campaign by Lebanon, during the 100th anniversary of the IAU. Beirut is the capital and largest city of Lebanon.^[4][5]

Discovery

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.^[6] Finally, in 2003 the planet was confirmed; the planet is thought to be causing fluctuations in the system's magnetic field, causing visible activity.^[7]

Characteristics

Preliminary astrometry in 2001 set its inclination at 179.5°;^[8] but it is now thought to be inclined according to the star's ecliptic, edge-on to Earth.

See also

• List of exoplanets discovered before 2000

References

Notes

1. 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. Archived from the original on 2011-09-28. Retrieved 2008-11-04.
2. "Astronomers discover six new planets orbiting nearby stars" (Press release). Kamuela, Hawaii: W. M. Keck Observatory. November 1, 1999. Retrieved December 19, 2017.
3. Vogt, Steven S.; et al. (2000). "Six New Planets from the Keck Precision Velocity Survey". The Astrophysical Journal. 536 (2): 902–914. arXiv:astro-ph/9911506. Bibcode:2000ApJ...536..902V. doi:10.1086/308981. S2CID 119375519.
4. "Approved names". NameExoworlds. Retrieved 2020-01-02.
5. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
6. See, "No Planet at All: Star Fools Astronomers, Who See Spots". Space.com article. Archived from the original on 2002-10-04.
7. 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. S2CID 16247618.
8. 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.

Bibliography

• Henry; Donahue, Robert A.; Baliunas, Sallie L. (2002). "A False Planet around HD 192263". The Astrophysical Journal Letters. 577 (2): L111 – L114. Bibcode:2002ApJ...577L.111H. doi:10.1086/344291.

External links

• "HD 192263". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2008-11-04.
• "A new extrasolar planet around the star HD 192263". university of Geneva website. – discovery announcement
• "The Controversial Planet Around HD 192263". exoplanets.org. Archived from the original on 2009-02-13.
• "Don't Take This Extrasolar Planet Off the List Just Yet Planet Around HD 192263". Space.com article. Archived from the original on 2002-09-11.
• "Observatory of Geneva and Laboratoire d'Astrophysique de l'EPFL". university of Geneva website. Archived from the original on 2010-01-20. Retrieved 2008-11-04.
• "Simulation HD 192263b". Observatory of Paris. Archived from the original on 2007-12-03.