The smaller star,OGLE-TR-122B, is estimated to have aradius around 0.12solar radii, or around 20% larger thanJupiter's, and amass of around 0.1solar masses, or approximately 100 times Jupiter's. This makes its averagedensity approximately 50 times the Sun's[2][3] or over 80 times the density ofwater. OGLE-TR-122b's mass is close to the lowest possible mass for ahydrogen-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.
^abcUdalski, 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.
