[net.space] speed of satellites query

cliff@terak.UUCP (08/17/84)

<take it, I don't care>
Yup, what you probably saw was a satellite. Based on your description
of brightness and speed it was probably 400km - 800km high and in a low
inclination orbit. The highest inclination possible is 90 degrees or polar.
Determining inclination really requires two seperated observations on the
same orbit. Next shuttle launch watch how fast the crew goes across North
America. 'bout nine minutes. At 320km altitude the orbit time is 
less then 90 minutes. (please don't flame my math I left my battery operated
brain at home today so we're talking ballpark)

What I find interesting is your time of observation, midnight. The trigometry
get a little thick but that bird was sunlit from directly over the pole. This
same object at the same position, relative to you, would probably not be 
visible in the winter. 

I usually see the best satellites about 60-90 minutes
after sunset. Any later than that and the ones still in the sun are so high
you need binoculars to spot them. They also have a slower apparent motion
so they don't catch your eye as well. A geostationary satellite
has a real slow apparent motion :-). If you can see one of those babies please
donate your eyes to Kitt Peak.

My best satellite story involved a newspaper blurp saying that STS 2 would be
visible at 4:51 am over Phoenix. They were in a white side down attitude doing
some kind of heating structure tests. I turned on the TV because one of 
the normally blank cable channels was displaying the raw NASA feed. (I also
watched the generic launch without the network boobs stepping all over CAPCOM)
The houston display showed the shuttle halfway between Honolulu and L.A. at
4:44. So I went outside and looked to the southwest. BOOM! It came out of the
shadow and was the brightest object in the moonless sky. In three or four
minutes I lost it in the northeast stars and ran inside. That sucker was over
Chicago! I still get goosebumps from that one.

		I remain
			Cliff Cordes
			...hao!noao!terak!cliff