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Exoplanet List of exoplanets
Exoplanet Comparison OGLE-TR-56 b.png
Size comparison of OGLE-TR-56b with Jupiter.
Parent star
Star OGLE-TR-56
Constellation Sagittarius
Right ascension (α) 17h 56m 35.51s[1]
Declination (δ) –29° 32′ 21.2″[1]
Distance~4,900 ly
(~1,500[2] pc)
Spectral type G?
Orbital elements
Semi-major axis(a) 0.0225 ± 0.0004 AU
(3.37 Gm)
Periastron (q) 0.0225 AU
(3.37 Gm)
Apastron (Q) 0.0225 AU
(3.37 Gm)
Eccentricity (e) 0
Orbital period(P) 1.211909 ± 0.000001 d
    (29.08582 h)
Orbital speed (υ) 203 km/s
Inclination (i) 78.8 ± 0.5°
Time of transit (Tt) 3936.598 ± 0.001 JD
Physical characteristics
Mass(m)1.29 ± 0.12 MJ
Radius(r)1.30 ± 0.05 RJ
Density(ρ)779 kg m−3
Surface gravity(g)19.8 m/s² (2.02 g)
Temperature (T) ~1973
Discovery information
Discovery date 3 November 2002
confirmed: 4 January 2003
Discoverer(s) Konacki et al.[3]
Discovery method Transit
Other detection methods Radial velocity
Discovery status Published[3]
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

OGLE-TR-56b is an extrasolar planet located approximately 1500 parsecs away in the constellation of Sagittarius, orbiting the star OGLE-TR-56. This planet was discovered on November 3, 2002[1] by the OGLE project using the transit method and confirmed on January 4, 2003 by the Doppler technique.[2] The period of this confirmed planet was the shortest until the confirmed discovery of WASP-12b on April 1, 2008.[4] The short period and proximity of the OGLE-TR-56 b to its host mean it belongs to a class of objects known as hot Jupiters.

The radial velocity trend of OGLE-TR-56, caused by the presence of OGLE-TR-56 b.

The planet is theorized to have iron rain.[5]

See also[edit]


  1. ^ a b c Udalski, A.; et al. (2002). "The Optical Gravitational Lensing Experiment. Search for Planetary and Low-Luminosity Object Transits in the Galactic Disk. Results of 2001 Campaign - Supplement". Acta Astronomica. 52 (2): 115–128. arXiv:astro-ph/0207133. Bibcode:2002AcA....52..115U.
  2. ^ a b Konacki, Maciej; et al. (2003). "High-Resolution Spectroscopic Follow-up of OGLE Planetary Transit Candidates in the Galactic Bulge: Two Possible Jupiter-Mass Planets and Two Blends". The Astrophysical Journal. 597 (2): 1076–1091. arXiv:astro-ph/0306542. Bibcode:2003ApJ...597.1076K. doi:10.1086/378561.
  3. ^ a b Konacki, Maciej; et al. (2003). "An extrasolar planet that transits the disk of its parent star" (PDF). Nature. 421 (6922): 507–509. Bibcode:2003Natur.421..507K. doi:10.1038/nature01379. PMID 12556885.
  4. ^ Hebb, L.; et al. (2009). "WASP-12b: THE HOTTEST TRANSITING EXTRASOLAR PLANET YET DISCOVERED". The Astrophysical Journal. 693 (2): 1920–1928. arXiv:0812.3240. Bibcode:2009ApJ...693.1920H. doi:10.1088/0004-637X/693/2/1920.
  5. ^ Harvard University and Smithsonian Institution (2003-01-08). "New World of Iron Rain". Astrobiology Magazine. Retrieved 2010-01-25.

External links[edit]

Media related to OGLE-TR-56 b at Wikimedia Commons

Coordinates: Sky map 17h 56m 35.51s, −29° 32′ 21.2″