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