Only small asddendum: The lowermost value in the first column (described in heading as DT) is mäneuver duration in days/hours:minutes:seconds.decimals of seceön. Approximately equak ti the burn time. The upeer two values are exactky speaking Time of ignition (TIG), i.e. start of the burn. < ------------ Původní zpráva ------------ < Od: Ted Molczan <ssl3molcz@rogers.com> < Předmět: RE: Regarding the ISS Orbit Boost < Datum: 17.6.2008 15:53:36 < ---------------------------------------- < Gene Harriman wrote: < < > I saw Kevin F.'s note on the ISS orbit boost, and I'm looking < > at the NASA page referenced. I see the part at the top where < > maneuvers are referenced. Can someone help me with what I'm < > looking at? < > That is, what do the various parts mean? < > < > IMPULSIVE TIG (GMT) M50 DVx(FPS) LVLH DVx(FPS) DVmag(FPS) < > IMPULSIVE TIG (MET) M50 DVy(FPS) LVLH DVy(FPS) Invar Sph HA < > DT M50 DVz(FPS) LVLH DVz(FPS) Invar Sph HP < > < > ------------------------------------------------------------------------ < > 171/06:52:31.233 9.6 11.3 11.4 < > N/A -3.1 0.1 186.8 < > 000/00:19:02.466 -5.1 0.2 186.2 < < The first column state the day and the time of the manoeuvre, as GMT and < mission-elapsed time (MET). < < The middle two columns state the Cartesian components of the velocity change in < feet per second; the first in an Earth-centred inertial frame, the second in < the < vehicle's Local Vertical Local Horizontal rotating, instantaneously inertial < frame. < < The final column states the magnitude of the velocity change in feet per < second, < and the resulting apogee and perigee height, in nautical miles. < < Additional information on the coordinate systems is available here: < < http://spaceflight1.nasa.gov/realdata/elements/index.html < < To generate predictions that take into account the manoeuvre, look up the < elements for the first coasting arc after the time of ignition; in this case, < coasting arc #4, as appended to this message. The elements are stated in < several < forms, but the most commonly used are the 2-line mean elements, which are < listed < last. < < Ted Molczan < < < Coasting Arc #4 (Orbit 2885) < --------------------------------------- < < Vector Time (GMT): 2008/171/07:02:02.466 < Vector Time (MET): N/A < Weight (LBS) : 661038.9 < < M50 Cartesian M50 Keplerian < ----------------------------------- -------------------------------- < X = 592665.98 A = 6718465.15 meter < Y = -4132509.24 meter E = .0005618 < Z = -5268729.42 I = 51.64927 < XDOT = 7649.903609 Wp = 88.16827 < YDOT = 836.463568 meter/sec RA = 5.03357 deg < ZDOT = 204.804353 TA = 183.77368 < MA = 183.77792 < Ha = 186.838 n.mi < Hp = 186.165 < < M50 Cartesian J2K Cartesian < ----------------------------------- -------------------------------- < X = 1944442.19 X = 664426.78 < Y = -13558101.20 feet Y = -4125479.33 meter < Z = -17285857.68 Z = -5265676.85 < XDOT = 25098.108954 XDOT = 7638.986683 < YDOT = 2744.303045 feet/sec YDOT = 921.948085 < meter/sec < ZDOT = 671.930291 ZDOT = 241.941191 < < TDR Cartesian TDR Cartesian < ----------------------------------- -------------------------------- < X = -973289.49 X = -296658.64 < Y = -13676663.91 feet Y = -4168647.16 meter < Z = -17274414.93 Z = -5265241.67 < XDOT = 24088.932026 XDOT = 7342.306482 < YDOT = -2742.140976 feet/sec YDOT = -835.804569 < meter/sec < ZDOT = 814.988173 ZDOT = 248.408395 < < < The mean element set is posted at the UTC for which position is < just north of the next ascending node relative to the above < vector time < < < TWO LINE MEAN ELEMENT SET < < ISS < 1 25544U 98067A 08171.30853553 .00020000 00000-0 20000-3 0 9031 < 2 25544 51.6413 5.4475 0009429 273.9651 86.0434 15.74579497 28861 < < Ted Molczan < < ------------------------------------------------------------------------- < Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: < http://www.satobs.org/seesat/seesatindex.html < < < < Mgr. Antonin Vitek, CSc. Office: Main Library, Academy of Sciences of the Czech Republic Narodni 3, CZ-11522 Praha 1 - Phone: +420/221 403 255, fax +420/224 240 611 Home: Kytin 127, CZ-25210 Mnisek p. B., Czech Republic Phone: +420/318 592 865, cell +420/603 148 201 - Coord.: 14.2178 deg E, 49.8485 deg N, 442 m ASL My satellite home page: http://www.lib.cas.cz/www/space.40/index.html Office e-mail: AVITEK@LIB.CAS.CZ ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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