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OGLE-2006-BLG-109L location.svg
Location of OGLE-2006-BLG-109L (green) in the constellation of Scorpius.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Scorpius
Right ascension 17h 52m 35.0s[1]
Declination –30° 05′ 16″[1]
Apparent magnitude (V) 17.17
Spectral type Unsure (probably M0V)
Distance 4,920 ± 390 ly
(1,510 ± 120 pc)
Mass 0.51 ± 0.04 M
Temperature ~4,000 K
Other designations
EWS 2006-BUL-109
Database references
Extrasolar Planets

OGLE-2006-BLG-109L (where 'L' stands for lens) is a dim magnitude 17 M0V galactic bulge star approximately 4,920 light-years away in the constellation of Scorpius.[1]

Planetary system[edit]

In 2008, two extrasolar planets were discovered around the star using gravitational microlensing. The two planets are at a distance from their star that make them suspected analogs of Jupiter and Saturn.[2]

A scheme of the planetary system.

The star is surrounded by a planetary system consisting of at least two planets: b with a mass of 0.727 of Jupiter and c with the mass of approximately 0.271 of Jupiter. Their mass ratios, distance ratios, and equilibrium temperatures are similar to those of Jupiter and Saturn in the solar system as well as the 47 UMa system.[2]

Both planets were discovered simultaneously by gravitational microlensing in a common effort by the Optical Gravitational Lensing Experiment, microFUN, MOA, PLANET and RoboNet collaborations, as announced on 14 February 2008. This is the first planetary system where more than one planet was detected using gravitational microlensing.

The OGLE-2006-BLG-109L planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.727 ± 0.06 MJ 2.3 ± 0.5 1790 ± 548  ?
c 0.271 ± 0.022 MJ 4.5 ± 1 4931 ± 1750 0.15 ± 0.1

See also[edit]


  1. ^ a b c "NAME OGLE 2006-BLG-109". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-30. 
  2. ^ a b Gaudi, B. S.; et al. (2008). "Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing". Science. 319 (5865): 927–930. Bibcode:2008Sci...319..927G. PMID 18276883. arXiv:0802.1920Freely accessible. doi:10.1126/science.1151947. 

External links[edit]

Coordinates: Sky map 17h 52m 35s, −30° 05′ 16″