MSL landing site ephemeris |
MSL landing site ephemeris |
Aug 6 2012, 03:57 PM
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#1
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Newbie Group: Members Posts: 18 Joined: 13-February 10 Member No.: 5222 |
Does anyone know where I can access a daily ephemeris for the Curiosity landing site? E.g. Sun rise/set, Earth rise/set, MRO/Odyssey/Mars Express transits, etc?
Thanks, Tom |
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Aug 6 2012, 05:20 PM
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#2
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Member Group: Members Posts: 102 Joined: 29-January 10 From: Poland Member No.: 5205 |
Does anyone know where I can access a daily ephemeris for the Curiosity landing site? E.g. Sun rise/set, Earth rise/set, MRO/Odyssey/Mars Express transits, etc? Thanks, Tom Hi, i use Guide software to calculate sunrise/sunset on Mars Sunrise at 20:10 UTC - Transit (Alt 74°) at 02:15 UTC - Sunset at 08:20 CET Earth rise at 17:45 UTC - Transit (Alt 62°) at 23:45 UTC - set at 05:45 CET MRO/Odyssey/Mars Express I don't know, I don't have good orbital data of this. Adam -------------------- Adam Hurcewicz from Poland
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Aug 6 2012, 05:39 PM
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#3
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Does anyone know where I can access a daily ephemeris for the Curiosity landing site? E.g. Sun rise/set, Earth rise/set, MRO/Odyssey/Mars Express transits, etc? It can be calculated with the NAIF SPICE data. If such a facility is not already available maybe I'll set up a web page. -------------------- |
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Aug 6 2012, 05:58 PM
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#4
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Newbie Group: Members Posts: 18 Joined: 13-February 10 Member No.: 5222 |
i use Guide software to calculate sunrise/sunset on Mars Sunrise at 20:10 UTC - Transit (Alt 74°) at 02:15 UTC - Sunset at 08:20 CET Earth rise at 17:45 UTC - Transit (Alt 62°) at 23:45 UTC - set at 05:45 CET MRO/Odyssey/Mars Express I don't know, I don't have good orbital data of this. Very cool Adam - what is "Guide" software? (LOTS of google results searching for that!) Does anyone know of a publicly-accessible MSL surface operations page or other resource that would include this information? Thanks, Tom |
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Aug 7 2012, 07:44 AM
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#5
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Member Group: Members Posts: 102 Joined: 29-January 10 From: Poland Member No.: 5205 |
Very cool Adam - what is "Guide" software? (LOTS of google results searching for that!) It's here http://www.projectpluto.com Very good soft. Adam -------------------- Adam Hurcewicz from Poland
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Aug 8 2012, 11:50 AM
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#6
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
I made an almanac up through Sept. 30 showing the MRO, ODY and MEX passes along with sun/earth rise and set:
MSL almanac Times are UT. If you click on the google calendar button on the lower right you can add it to your own google calendar & display times in other time zones. The data are based on the most current SPICE kernels published on http://naif.jpl.nasa.gov/naif/data_mars.html and are predictions subject to change. -------------------- |
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Aug 8 2012, 12:35 PM
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#7
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Member Group: Members Posts: 221 Joined: 25-March 05 Member No.: 217 |
Very good and very useful.
Thanks Joe Roy F |
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Aug 8 2012, 03:07 PM
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#8
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Newbie Group: Members Posts: 18 Joined: 13-February 10 Member No.: 5222 |
Fantastic - thank you!
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Aug 8 2012, 03:34 PM
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#9
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Member Group: Members Posts: 102 Joined: 29-January 10 From: Poland Member No.: 5205 |
Very good job, Joe! Thank you !
-------------------- Adam Hurcewicz from Poland
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Aug 8 2012, 04:41 PM
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#10
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Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
Thanks Joe!
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Aug 8 2012, 04:45 PM
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#11
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Super!
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Aug 9 2012, 12:52 AM
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#12
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Hopefully there aren't any bugs--open to suggestions for V2. Emily asked for a basic table showing the UTC for sunrise, sunset, etc. Here it is for the first 1000 sols (see attached zip file):
msl_sundata.zip ( 29.41K ) Number of downloads: 714 -------------------- |
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Aug 9 2012, 02:10 AM
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#13
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Marvelous. Thank you!
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Aug 9 2012, 11:45 AM
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#14
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Marvelous. Thank you! I should point out that that table reckons the start of each sol from midnight LTST (local true solar time), i.e., when the sun actually crosses the meridian. I since gather that the landed missions use LMST (local mean solar time). From Technical Notes on Mars Solar Time QUOTE The Mars Science Laboratory rover project also defined Sol 0 as the solar day on which the lander would touch down. Mission controllers originally specified a mission clock based on the Local Mean Solar Time for a landing site at 137.42°E. Thus, official mission time specified the Sol 0 epoch would start at local mean midnight at 137.42°E prior to landing. However, as the landing site coordinates were later refined, after course corrections were made while MSL Curiosity was in-flight to Mars, and as the rover touched down somewhat "long" of the final target coordinates, the landing site turned out to be at 137.441635°E. Following the example of Phoenix, there was no re-definition of the MSL mission clock to match the actual landing coordinates, and so a difference of a several seconds between LMST at the landing site and mission clock resulted. LMST diverges from LTST over the year as Mars speeds up and slows down in its eccentric orbit. The difference can be as much as 51 minutes. Also, as I understand the practice, the local time reference is not adjusted as the rover moves, but is fixed at some "time zone" so to speak, e.g., AMT+11:00:04 for Spirit. Maybe that table needs to be redone, as soon as I can find out for sure how JPL defines the start of each MSL sol. At least, the sunrise and sunset UTC times are accurate -------------------- |
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Aug 9 2012, 01:20 PM
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#15
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
as soon as I can find out for sure how JPL defines the start of each MSL sol. See ftp://naif.jpl.nasa.gov/pub/naif/MSL/kern...gc120806_v3.tsc -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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