LROC news and images |
LROC news and images |
Guest_Zvezdichko_* |
Jun 19 2009, 11:25 AM
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#101
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Guests |
I know it may be too early for such a thread, but an announcement has to be made.
The official website of the LROC camera is: http://lroc.sese.asu.edu/ A brief description plus status is available here: http://www.msss.com/lro/lroc/index.html |
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Aug 29 2009, 04:03 PM
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#102
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
It's certainly counting up in seconds. I usually just make an Excel spreadsheet that takes the time quoted on an official release and the MET and then set up a formula that can calculate the date for any MET. But for LROC it doesn't really seem to be necessary, since they're putting the UTC time on all the Zoomify images. For instance this one which we're told is from Tue Aug 04 14:51:59 UTC 2009. Taking the whole nine-digit number as the date, it counts up from April 18, 2006, but I think it's more likely that the first digit isn't part of the counter, so it counts up from June 18 at 14:32:12. This was exactly 7 hours before launch. Maybe that was when they booted the spacecraft computer?
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Aug 29 2009, 06:49 PM
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#103
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
This was exactly 7 hours before launch. Sounds like the difference between UT and MST where the LROC operations center is. Maybe some time system confusion there. Presumably somewhere they have documented the definition of MET 0 in UT (or better, ET.) I'm a little surprised they used MET; we usually use some arbitrary time like 0 Ephemeris Time ("epoch of J2000"). The first digit is probably what they meant by "a single digit for partition which denotes a reset of the MET". I've seen clearer pieces of PDS documentation -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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