The launch window opens at 10:44 PM EDT (12 March)which should be 4:44 UT on 13 March. Was thew 244 UT time below a typo or do the elsets need to be adjusted for the 4:44 UT launch time? What is the expected venting time after payload deployment? Ron Lee > An Atlas 5 rocket will launch MMS, the Magnetospheric Multi-Scale > mission on April 13th, between 02:44 and 03:14UT, from CCAFS. The > mission overview booklet shows that the Centaur upper stage will > insert the payload into a 585x70169 km orbit inclined at 28.77 > degrees, after the stack has coasted in a LEO orbit to the first > ascending node. > http://www.ulalaunch.com/uploads/docs/Mission_Booklets/AV/av_mms_mob.pdf > > Based on the time, latitude and longitude of the MECO-2 and MMS-1 > separation events, I use the known perigee, apogee and inclination to > fit the RA of the ascending node, argument of perigee and mean > anomaly. The fit yield the following orbital elements, which are valid > from MECO-2 to the MMS-1 separation: > > MMS GTO Coast (02:44UT launch) > 1 84001U 15999A 15072.11388889 .00000000 00000-0 00000-0 0 00 > 2 84001 28.7700 29.0124 8332309 25.8172 339.9766 1.01758185 09 > MMS GTO Coast (03:14UT launch) > 1 84002U 15999A 15072.13472222 .00000000 00000-0 00000-0 0 08 > 2 84002 28.7700 36.5268 8332309 25.9621 340.0397 1.01758185 05 > > These elements span the start and end of the launch window. > > The payload consists of four identical spacecraft (MMS-1 to 4), which > will be released in 5 minute intervals after insertion into the GTO > type orbit. The following table gives the UTC timings from the mission > overview, and the shadow entry and exit as per the elements. > > Event 84001 84002 > ================================ > Launch 02:44:00 03:14:00 > MECO-2 04:02:11 04:32:11 > MMS-4 sep 04:16:11 04:46:11 > MMS-3 sep 04:21:11 04:51:11 > MMS-2 sep 04:26:11 04:56:11 > MMS-1 sep 04:31:11 05:01:11 > -------------------------------- > Shadow entry 04:36:14 04:57:11 > Shadow exit 05:17:14 05:31:31 > > As of yet there are no broadcast warnings that suggest that the > Centaur upper stage will be deorbited. This may mean it will be > inserted into Solar orbit. For either possibility, it is expected that > the Centaur will perform a Contamination and Collision Avoidance > Maneuver (CCAM), followed by the dumping of the remaining fuel. > > The ground track from the mission overview shows that the separation > of the payloads and the subsequent CCAM and fueldump should be visible > from the continental US. Note though that the payloads and upper stage > will enter the shadow around the times specified in the above table. > > Regards, > Cees > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Thu Mar 12 2015 - 18:58:20 UTC
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