OGLE-TR-122

OGLE-TR-122

The Earth-Moon orbit, Saturn, OGLE-TR-122b, Jupiter, and other objects, to scale.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Carina
Right ascension 11h 06m 51.99s[1]
Declination −60° 51′ 45.7″[1]
Characteristics
Spectral type ? (primary)/M (b)[2]
Apparent magnitude (I) 15.61 (system)[1]
Variable type Eclipsing binary
Orbit[2]
Period (P)7.26867 d
Eccentricity (e)0.205 ± 0.008
Inclination (i)88–90°
Periastron epoch (T)JD 2452342.41 ± 0.02
Argument of periastron (ω)
(secondary)
99.2 ± 0.8°
Semi-amplitude (K1)
(primary)
9.642 ± 0.088 km/s
Details[2]
OGLE-TR-122A
Mass0.98 ± 0.14 M
Radius1.05+0.20
−0.09
 R
Surface gravity (log g)3.9 ± 0.5 cgs
Temperature5700 ± 300 K
Metallicity [Fe/H]0.15 ± 0.36 dex
Rotational velocity (v sin i)5.7 ± 0.6 km/s
OGLE-TR-122B
Mass0.092 ± 0.009 M
Radius0.120+0.024
−0.013
 R
Other designations
V817 Car
Database references
SIMBADdata

OGLE-TR-122 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 7.3 days. The system's primary is thought to resemble the Sun.[2]

  1. ^ a b c Udalski, A.; Pietrzynski, G.; Szymanski, M.; Kubiak, M.; Zebrun, K.; Soszynski, I.; Szewczyk, O.; Wyrzykowski, L. (2003). "The Optical Gravitational Lensing Experiment. Additional Planetary and Low-Luminosity Object Transits from the OGLE 2001 and 2002 Observational Campaigns". Acta Astronomica. 53: 133. arXiv:astro-ph/0306444. Bibcode:2003AcA....53..133U.
  2. ^ a b c d Pont, F.; Melo, C. H. F.; Bouchy, F.; Udry, S.; Queloz, D.; Mayor, M.; Santos, N. C. (April 2005). "A planet-sized transiting star around OGLE-TR-122: Accurate mass and radius near the hydrogen-burning limit". Astronomy & Astrophysics. 433 (2): L21–L24. arXiv:astro-ph/0501611. Bibcode:2005A&A...433L..21P. doi:10.1051/0004-6361:200500025. ISSN 0004-6361. S2CID 14799999.{{cite journal}}: CS1 maint: date and year (link)