OGLE-TR-111

OGLE-TR-111 is a yellow dwarf star approximately 3,600 light-years away in the constellation of Carina (the Keel) with an apparent magnitude of about 17. Because its apparent brightness changes when one of its planets transits, the star has been given the variable star designation V759 Carinae.

OGLE-TR-111

A light curve showing the February 17, 2009 planet transit across OGLE-TR-111. Adapted from Adams et al. (2010)[1]
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Carina
Right ascension	10h 53m 17.81s[2]
Declination	−61° 24′ 20.6″[2]
Apparent magnitude (V)	16.96 - 16.98[3]
Characteristics
Evolutionary stage	main sequence[4]
Spectral type	K[4]
Variable type	planetary transit[3]
Astrometry
Proper motion (μ)	RA: −8.952[2] mas/yr Dec.: +6.216[2] mas/yr
Parallax (π)	0.8978±0.0407 mas[2]
Distance	3,600 ± 200 ly (1,110 ± 50 pc)
Absolute magnitude (MV)	+6.82[5]
Details
Mass	0.82±0.15[5] M☉
Radius	0.831±0.031[5] R☉
Luminosity	0.4[6] L☉
Surface gravity (log g)	4.12[7] cgs
Temperature	4,856[7] K
Metallicity [Fe/H]	0.21[7] dex
Rotational velocity (v sin i)	5.0[8] km/s
Age	6.6[9] Gyr
Other designations
OGLE-TR-111, V759 Carinae
Database references
SIMBAD	data

Planetary system

In 2002 the Optical Gravitational Lensing Experiment (OGLE) survey detected that the light from the star periodically dimmed very slightly every 4 days, indicating a planet-sized body transiting the star. But since the mass of the object had not been measured, it was not clear that it was a true planet, low-mass red dwarf or something else.^[10] In 2004 radial velocity measurements showed unambiguously that the transiting body is indeed a planet.^[11]

The planet is probably very similar to the other "hot Jupiters" orbiting nearby stars. Its mass is about half that of Jupiter and it orbits the star at a distance less than 1/20th that of Earth from the Sun.

Unconfirmed planet candidate

In 2005, evidence of another transit was announced. Planet "OGLE-TR-111c" is a possible extrasolar planet orbiting the star. It was first proposed in 2005 based on preliminary evidence from the Optical Gravitational Lensing Experiment (OGLE) survey. More data is required to confirm this planet candidate. If it is confirmed, OGLE-TR-111 would become one of the first stars with a pair of transiting planets.^[5]

The OGLE-TR-111 planetary system

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.53 ± 0.11 MJ	0.047 ± 0.001	4.0144479 ± 4.1e-06	0	—	—
c (unconfirmed)	0.7 ± 0.2 MJ	0.12 ± 0.01	16.0644 ± 0.0050	0	—	—

See also

• OGLE-2005-BLG-390L
• List of extrasolar planets