OGLE-TR-123

A light curve showing the March 30, 2005 planet transit across OGLE-TR-123. Adapted from Pontet al. (2006)[1]
Observation data EpochJ2000.0      EquinoxJ2000.0 (ICRS)
Constellation	Carina
Right ascension	11h 06m 51.19s[2]
Declination	−61° 11′ 10.1″[2]
Characteristics
Spectral type	F (primary)/M (b)[3]
Apparent magnitude (I)	15.40 (system)[2]
Variable type	Eclipsing binary
Astrometry
Distance	5000 ± 1000 ly (1600 ± 400[3] pc)
Orbit
Period (P)	1.804[3]days
Semi-major axis (a)	0.031 ± 0.002AU[3]
Eccentricity (e)	0[3]
Inclination (i)	86–90°[3]°
Details[3]
OGLE-TR-123A
Mass	1.3 M☉
Radius	1.55 R☉
Temperature	6700 ± 300 K
OGLE-TR-123b
Mass	0.085 M☉
Radius	0.13 R☉
Other designations
V816 Car,2MASS J11065112-6111103
Database references
SIMBAD	data

OGLE-TR-123 is abinarystellar system containing one of the smallestmain-sequencestars whoseradius has been measured. It was discovered when theOptical Gravitational Lensing Experiment (OGLE) survey observed the smaller star eclipsing the larger primary. The orbital period is approximately 1.80 days.^[3]

The smaller star,OGLE-TR-123B, is estimated to have aradius around 0.13solar radii, and amass of around 0.085solar masses (M_☉), or approximately 90 times Jupiter's. OGLE-TR-123b's mass is close to the lowest possible mass, estimated to be around 0.07 or 0.08M_☉, for ahydrogen-fusing star.^[4]

• OGLE-TR-122
• EBLM J0555-57

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