From: utzoo!decvax!harpo!eagle!karn Newsgroups: net.space Title: Re: IRAS orbit Article-I.D.: eagle.747 Posted: Wed Jan 26 23:35:03 1983 Received: Sun Jan 30 03:11:05 1983 References: pur-phy.654 I don't know the orbital elements offhand for IRAS, but the launch site and time suggest that it is in a 6AM-6PM sun-synchronous orbit. That is, it will pass over each point on the earth twice per day, and always at the same local time: 6PM for the "descending" pass (north to south) and 6AM for the "ascending" pass (south to north). Phil