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AN INFINITE GROUP WITH SUBGROUPS OF PRIME ORDERS
Mathematics of the USSR-Izvestiya
We have discovered that SDSS J105213.51+442255.7 (T0.5 ± 1.0) is a binary in Keck laser guide star adaptive optics imaging, displaying a large J-to K-band flux reversal (D = - We determine a total dynamical mass from Keck orbital monitoring (88 ± 5 M Jup ) and a mass ratio by measuring the photocenter orbit from CFHT/WIRCam absolute astrometry ( 1.11 0.20 0.17 Gyr) and surface gravity ( g log = 5.0-5.2) of SDSS J1052+4422AB are typical for field ultracool dwarfs.doi:10.1070/im1981v016n02abeh001307 fatcat:oehcjik3vrcy3inho3acuxtxj4