Using this info from Jonathan's Space Report 469: >... >Space Shuttle mission STS-108 (ISS mission UF-1) was launched on Dec 5 >at 2219:28 UTC. Endeavour reached an orbit of approximately 58 x 230 km >(according to the NASA PAO) at 2228 UTC. At 2259 UTC Endeavour fired >its OMS engines to raise perigee to 225 km. Mass after OMS-2 was >... and Daniel Deak's OIG predicted orbit (for the first launch attempt, but still matches the figures above) STS-108 (OMS-1) 228 x 57 1 99108U 01339.00611734 .00000000 00000-0 10050-9 0 9004 2 99108 51.6378 310.0696 0131698 348.8100 11.0180 16.48778271 20 and assuming that the OMS-1 burn was made at the 230 km apogee, I get the altitude 31 minutes earlier (launch+8.5 min) as 92 km. In contrast, the SkyMap.trj I was using has after 8.5 minutes: 510 37.552 -69.261 104.860834 i.e. 12 km HIGHER, and at the end (35 min) 2100 16.638 53.085 301.676184 - far too high. So why would predictions be too low? ----- Original Message ----- ... > > Question: I used the "shuttle.trj" file from the archives in Skymap. This, > along with several other sources, indicated a maximum altitude of about 7 > degrees for DC. However, as noted above, the actual path was easily twice > as high. Since this file was generated several years ago for one of the Mir > flights, I'm wondering if there has been a change in the ascent profile for > flights to ISS? I know that they are phasing in new SSME's and SRM's, and > there are some new maneuvers that are beign executed during powered ascent > to place the shuttle in better orientation for TDRSS relay. Any thoughts on > this? > ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Tue Dec 11 2001 - 14:15:25 EST