OGLE-TR-122

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OGLE-TR-122
other objects
, to scale.
Observation data
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
Semi-amplitude
(K1)
(primary)		9.642 ± 0.088 km/s
Details
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☉
V817
 Car
Database references
SIMBADdata

OGLE-TR-122 is a

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]

OGLE-TR-122B

The smaller star, OGLE-TR-122B, is estimated to have a

solar radii, or around 20% larger than Jupiter's, and a mass of around 0.1 solar masses, or approximately 100 times Jupiter's. This makes its average density approximately 50 times the Sun's[2][3] or over 80 times the density of water. OGLE-TR-122b's mass is close to the lowest possible mass for a hydrogen-fusing star, estimated to be around 0.07 or 0.08 solar masses.[4] The observed transit provides the first direct evidence for a star with a radius comparable to Jupiter's.[2]

  • Brightness «Dip» and Velocity Variations of OGLE-TR-122.
    Brightness «Dip» and Velocity Variations of OGLE-TR-122.

See also

References

  1. ^ a b c The Optical Gravitational Lensing Experiment. Additional Planetary and Low-Luminosity Object Transits from the OGLE 2001 and 2002 Observational Campaigns, A. Udalski, G. Pietrzynski, M. Szymanski, M. Kubiak, K. Zebrun, I. Soszynski, O. Szewczyk, and L. Wyrzykowski, Acta Astronomica 53 (June 2003), pp. 133–149.
  2. ^
    S2CID 14799999
    .
  3. ^ Newfound Star Smaller than Some Planets, Robert Roy Britt, space.com, accessed on line May 16, 2007.
  4. S2CID 59325115
    .
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