Данные Dubline Core
Новичонок Артем Олегович, Ковальский Ричард
астрономия, Кометы, малые тела солнечной системы, обсерватории, C/2012 S1, кома кометы, comet C/2012 S1 (ISON), Mt. Lemmon, comet activity, great comet
Comet C/2012 S1 (ISON) promises to be a great comet in November-December 2013, near its perihelion. At the moment of its discovery it was already quite bright, with a well-defined coma. The CCD-images of the comet, taken by Mt. Lemmon sky survey nine months before it was officially discovered, have been thoroughly examined. At that time the object was located at a distance of 8.67 A.U. from the Sun. The examination of the images revealed well-marked comet activity: the share of the coma into the integrated brightness of the comet exceeded hundredfold the share of the nucleus. The coma of comet was no more than 60 000 km in diameter.