OGLE-TR-123
Star in the constellation Carina
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OGLE-TR-123 is a binary stellar system containing one of the smallest main-sequence stars whose radius has been measured. It was discovered when the Optical Gravitational Lensing Experiment (OGLE) survey observed the smaller star eclipsing the larger primary. The orbital period is approximately 1.80 days.[5]
A light curve showing the March 30, 2005 planet transit across OGLE-TR-123. Adapted from Pont et al. (2006)[1] | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Carina[2] |
| Right ascension | 11h 06m 51.19s[3] |
| Declination | −61° 11′ 10.1″[3] |
| Apparent magnitude (V) | 16.2[4] |
| Characteristics | |
| Spectral type | F (primary)/M (b)[5] |
| Apparent magnitude (I) | 15.40 (system)[3] |
| Variable type | Algol[6] |
| Astrometry | |
| Distance | 5,000±1,000 ly (1,600±400[5] pc) |
| Orbit | |
| Period (P) | 1.804[5] days |
| Semi-major axis (a) | 0.031±0.002 AU[5] |
| Eccentricity (e) | 0[5] |
| Inclination (i) | 86–90°[5]° |
| Details[5] | |
| OGLE-TR-123A | |
| Mass | 1.3 M☉ |
| Radius | 1.55 R☉ |
| Temperature | 6,700±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-123B
The smaller star, OGLE-TR-123B, is estimated to have a radius around 0.13 solar radii, and a mass of around 0.085 solar 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 0.08 M☉, for a hydrogen-fusing star.[7]
