85 Pegasi is amultiple star system 39.5light years away[3] in theconstellation ofPegasus. The primary component is sixthmagnitude85 Pegasi A, which is ayellow dwarf like theSun. The secondary component,85 Pegasi B, is a ninth magnitudeorange dwarf that takes 26.28 years to orbit at 10.3AU around the primary in an elliptical orbit. Theorbital distance ranges from 6.4 AU atperiastron to 14.2 AU atapastron. 85 Pegasi B may itself be a binary, with a close, faintred dwarf companion (designated 85 Pegasi Bb) separated by 2AU from the primary (designated 85 Pegasi Ba). The mass would be 11%solar mass (M☉). All components in thestar system including Star A are smaller, cooler and less massive, luminous, and metallic than the Sun and51 Pegasi.
Aninfrared excess has been detected around the primary, most likely indicatingthe presence of acircumstellar disk at a radius of more than 97 AU. The temperature of this dust is below 25 K.[7]
^abcdefgHuber, D.; Matthews, J. M.; Croll, B.; Obbrugger, M.; Gruberbauer, M.; Guenther, D. B.; Weiss, W. W.; Rowe, J. F.; Kallinger, T.; Kuschnig, R.; Scholtz, A. L.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. a. H. (2009-10-01). "A search for p-modes and other variability in the binary system 85 Pegasi using MOST photometry".Astronomy & Astrophysics.505 (2):715–725.arXiv:0907.1929.doi:10.1051/0004-6361/200912139.ISSN0004-6361.
