Open main menu

OGLE-TR-56 is a dim, distant, magnitude 17 Sun-like star located approximately 1500 parsecs away in the constellation of Sagittarius.[1] This star is listed as an eclipsing type variable star with the eclipse due to the passage of the planet as noted in the discovery papers.[5]

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension  17h 56m 35.51s[1]
Declination –29° 32′ 21.2″[1]
Apparent magnitude (V) 16.560<[1]
Spectral type G[2]
Variable type EP[3]
Distance~5,000 ly
(~1,500 pc)
Mass1.17 ± 0.04[4] M
Radius1.32 ± 0.06[4] R
Other designations
V5157 Sagittarii, SBC9 2452
Database references
Extrasolar Planets


Planetary systemEdit

In 2002, a possible planet was discovered transiting the star[5], and after additional observations to rule out false positives, it was confirmed. At the time of discovery it was the shortest period planet.[6][7]

The OGLE-TR-56 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 1.29 ± 0.12[4] MJ 0.0225 ± 0.0004[2] 1.211909 ± 0.000001[4] 0

See alsoEdit


  1. ^ a b c d "SIMBAD query result: V* V5157 Sgr -- Star showing eclipses by its planet". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-30.
  2. ^ a b Planet : OGLE-TR-56 b, Extrasolar Planets Encyclopaedia. Accessed on line August 22, 2008.
  3. ^ "General Catalogue of Variable Stars Query results". Sternberg Astronomical Institute, Moscow, Russia. Sternberg Astronomical Institute. Retrieved 2009-04-30.
  4. ^ a b c d Pont, F.; et al. (2007). "The "666" collaboration on OGLE transits I. Accurate radius of the planets OGLE-TR-10b and OGLE-TR-56b with VLT deconvolution photometry". Astronomy and Astrophysics. 465 (3): 1069–1074. arXiv:astro-ph/0610827. Bibcode:2007A&A...465.1069P. doi:10.1051/0004-6361:20066645.
  5. ^ a b 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.
  6. ^ 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.
  7. ^ 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.

External linksEdit

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