Dec 4th News Conference |
Dec 4th News Conference |
Dec 3 2008, 08:58 PM
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#1
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
http://www.nasa.gov/home/hqnews/2008/dec/H...MSL_Update.html
From the wording of this announcement, MSL is clearly still on, which is a good thing. We'll have to wait and see. Doug |
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Dec 4 2008, 11:29 PM
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#2
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
True, but you had an orbiting satellite which has a relative velocity of it's own involved. I would intuitively expect that the DTE sessions would be longer.
-------------------- If Occam had heard my theory, things would be very different now.
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Dec 4 2008, 11:40 PM
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#3
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
I would intuitively expect that the DTE sessions would be longer. Certainly. A typical UHF pass is only 5-10 minutes long (satellite rise to set), whereas a DTE pass in theory could be for as long as the Earth was in view, less DSN station handoff. MER DTE passes are as short as they are for power and thermal reasons. DTE is much less efficient than relay on an energy/bit basis, and that's probably the big disadvantage of DTE. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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