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    comc navigation structure General retroreflector info ilrs support center of mass site perf info

GFO-1

Array Offset:

Location of satellite reflector center in GFO-1 body-fixed coordinate system. ( Y-axis anti-parallel with velocity, Z-axis away from nadir)

X(m) Y(m) Z(m)
+1.100 0.782 0.521

SLR-offset information is from an empirical adjustment from a priori values supplied by Ball Aerospace.(ref: "Evaluation of the GEOSAT and GEOSAT Follow-On Precise Orbit Ephemeris", Lemoine et. al, poster presentation to the 2007 Ocean Surface Topography Science Team Meeting, Hobart, Australia, March, 2007.)

Atitude Information:

The pdf files below describe the attitude regimes followed by the GFO spacecraft. The files include memoranda from Ball Aerospace to JPL describing the regimes, an attitude mode description document, sample fortran code of the gfo attitude subroutine in Gypsy/Oasis, and sample output from a driver to the attitude program.

spacecraft attitude information

Center of Mass Offset:

The time evolution for GFO-1 satellite mass and the location of the center-of-mass in the GFO-1 body fixed coordinate system. The time dependence is due to fuel consumption during maneuvers. A text file of the following table is available here.

Location of spacecraft center-of-mass in GFO-1 body-fixed coordinate system.
end date mass (kg) offset in m
year mon day hhmmss.ss X Y Z
2000 1 17 144500 369.0000 0.9076 0.0200 -0.0761
2000 2 13 133500 368.9960 0.9076 0.0200 -0.0761
2000 2 25 154500 368.9934 0.9076 0.0200 -0.0761
2000 3 7 013500 368.9876 0.9076 0.0200 -0.0761
2000 3 21 124500 368.9803 0.9076 0.0200 -0.0761
2000 4 1 001800 368.9730 0.9076 0.0200 -0.0761
2000 4 8 000100 368.9657 0.9076 0.0200 -0.0762
2000 4 8 014100 368.9614 0.9077 0.0200 -0.0762
2000 4 19 010100 368.9597 0.9077 0.0200 -0.0762
2000 4 19 024100 368.9524 0.9077 0.0200 -0.0762
2000 5 11 162500 368.9454 0.9077 0.0200 -0.0762
2000 5 24 044800 368.9400 0.9077 0.0200 -0.0762
2000 6 16 061500 368.9363 0.9077 0.0200 -0.0762
2000 6 23 063700 368.9138 0.9077 0.0200 -0.0762
2000 6 24 015500 368.8886 0.9078 0.0200 -0.0762
2000 6 28 022900 368.8835 0.9078 0.0200 -0.0762
2000 7 20 125400 368.8785 0.9078 0.0200 -0.0762
2000 8 4 050000 368.8754 0.9078 0.0200 -0.0762
2000 8 24 043300 368.8707 0.9078 0.0200 -0.0762
2000 9 14 184500 368.8648 0.9078 0.0200 -0.0762
2000 9 29 005300 368.8583 0.9078 0.0200 -0.0762
2000 10 9 122800 368.8511 0.9078 0.0200 -0.0762
2000 10 26 020000 368.8502 0.9078 0.0200 -0.0762
2000 10 26 034000 368.8429 0.9079 0.0200 -0.0762
2000 11 8 034300 368.8356 0.9079 0.0200 -0.0762
2000 11 22 044700 368.8320 0.9079 0.0200 -0.0762
2000 12 4 065500 368.8249 0.9079 0.0200 -0.0762
2000 12 8 021900 368.8234 0.9079 0.0200 -0.0762
2000 12 28 125300 368.8178 0.9079 0.0200 -0.0762
2001 1 30 014700 368.8118 0.9079 0.0200 -0.0762
2001 3 1 230600 368.8059 0.9079 0.0200 -0.0762
2001 3 21 005500 368.7997 0.9079 0.0200 -0.0762
2001 3 30 034300 368.7925 0.9080 0.0200 -0.0762
2001 4 3 005100 368.7853 0.9080 0.0200 -0.0762
2001 4 3 023100 368.7780 0.9080 0.0200 -0.0762
2001 4 4 014200 368.7708 0.9080 0.0200 -0.0762
2001 4 4 032200 368.7697 0.9080 0.0200 -0.0762
2001 4 13 003000 368.7636 0.9080 0.0200 -0.0762
2001 5 2 053900 368.7571 0.9080 0.0200 -0.0762
2001 5 8 050500 368.7560 0.9080 0.0200 -0.0762
2001 5 31 233900 368.7526 0.9080 0.0200 -0.0762
2001 6 29 000300 368.7496 0.9080 0.0200 -0.0762
2001 8 14 005500 368.7457 0.9080 0.0200 -0.0762
2001 8 31 002700 368.7408 0.9080 0.0200 -0.0762
2001 9 15 024400 368.7341 0.9081 0.0200 -0.0762
2001 9 28 010300 368.7313 0.9081 0.0200 -0.0762
2001 9 28 024300 368.7241 0.9081 0.0200 -0.0762
2001 10 11 024600 368.7227 0.9081 0.0200 -0.0762
2001 10 11 042600 368.7154 0.9081 0.0200 -0.0762
2001 10 23 032900 368.7133 0.9081 0.0200 -0.0762
2001 10 23 050900 368.7059 0.9081 0.0200 -0.0762
2001 11 1 052800 368.6994 0.9081 0.0200 -0.0762
2001 11 15 012100 368.6936 0.9081 0.0200 -0.0762
2001 11 29 004000 368.6882 0.9081 0.0200 -0.0762
2001 12 13 012200 368.6828 0.9081 0.0200 -0.0762
2001 12 26 055300 368.6820 0.9081 0.0200 -0.0762
2001 12 26 073400 368.6749 0.9082 0.0200 -0.0762
2002 1 3 032300 368.6694 0.9082 0.0200 -0.0762
2002 1 7 194400 368.6676 0.9082 0.0200 -0.0762
2002 1 16 232600 368.6670 0.9082 0.0200 -0.0762
2002 1 17 010600 368.6598 0.9082 0.0200 -0.0762
2002 1 28 020800 368.6573 0.9082 0.0200 -0.0762
2002 1 28 034800 368.6502 0.9082 0.0200 -0.0762
2002 1 31 021100 368.6449 0.9082 0.0200 -0.0762
2002 2 13 002700 368.6404 0.9082 0.0200 -0.0762
2002 2 13 020700 368.6333 0.9082 0.0200 -0.0762
2002 2 27 013300 368.6301 0.9082 0.0200 -0.0762
2002 2 27 031300 368.6229 0.9083 0.0200 -0.0762
2002 3 7 040600 368.6171 0.9083 0.0200 -0.0762
2002 3 19 013200 368.6147 0.9083 0.0200 -0.0762
2002 3 19 031200 368.6075 0.9083 0.0200 -0.0762
2002 4 4 032000 368.6066 0.9083 0.0200 -0.0762
2002 4 4 050000 368.5994 0.9083 0.0200 -0.0762
2002 4 23 013300 368.5927 0.9083 0.0200 -0.0762
2002 5 23 005300 368.5885 0.9083 0.0200 -0.0762
2002 6 13 230400 368.5856 0.9083 0.0200 -0.0762
2002 7 24 194800 368.5814 0.9083 0.0200 -0.0762
2002 8 8 234400 368.5782 0.9083 0.0200 -0.0762
2002 8 22 231100 368.5715 0.9083 0.0200 -0.0762
2002 9 13 000000 368.5643 0.9084 0.0200 -0.0762
2002 10 2 232500 368.5578 0.9084 0.0200 -0.0762
2002 10 24 000500 368.5524 0.9084 0.0200 -0.0762
2002 11 14 235500 368.5476 0.9084 0.0200 -0.0762
2002 12 11 012600 368.5423 0.9084 0.0200 -0.0762
2002 12 27 013005 368.5373 0.9084 0.0200 -0.0762
2003 1 23 023200 368.5315 0.9084 0.0200 -0.0762
2003 2 18 022800 368.5259 0.9084 0.0200 -0.0762
2003 3 21 015000 368.5217 0.9084 0.0200 -0.0762
2003 4 29 015800 368.5182 0.9084 0.0200 -0.0762
2003 5 9 015200 368.5171 0.9084 0.0200 -0.0762
2003 6 12 005600 368.5136 0.9084 0.0200 -0.0762
2003 7 18 022100 368.5103 0.9085 0.0200 -0.0762
2003 8 22 042400 368.5063 0.9085 0.0200 -0.0762
2003 9 22 012132 368.4991 0.9085 0.0200 -0.0762
2003 9 22 022222 368.4919 0.9085 0.0200 -0.0762
2003 10 2 223300 368.4864 0.9085 0.0200 -0.0763
2003 10 7 000500 368.4724 0.9085 0.0200 -0.0763
2003 11 7 015000 368.4674 0.9085 0.0200 -0.0763
2003 12 5 010200 368.4627 0.9085 0.0200 -0.0763
2004 1 13 222251 368.0982 0.9092 0.0200 -0.0763
2004 1 15 030700 368.0882 0.9092 0.0200 -0.0763
2004 3 3 013000 368.0856 0.9092 0.0200 -0.0763
2004 4 1 235600 368.0829 0.9092 0.0200 -0.0763
2004 4 15 013200 368.0816 0.9092 0.0200 -0.0763
2004 5 27 013200 368.0788 0.9092 0.0200 -0.0763
2004 7 4 010500 368.0760 0.9092 0.0200 -0.0763
2004 8 26 000000 368.0733 0.9092 0.0200 -0.0763
2004 10 28 000000 368.0708 0.9092 0.0200 -0.0763
2004 11 24 000000 368.0670 0.9092 0.0200 -0.0763
2005 1 7 061100 368.0644 0.9092 0.0200 -0.0763
2005 2 18 000000 368.0632 0.9092 0.0200 -0.0763
2005 4 27 013000 368.0609 0.9093 0.0200 -0.0763
2005 6 9 024400 368.0586 0.9093 0.0200 -0.0763
2005 7 13 002100 368.0582 0.9093 0.0200 -0.0763
2005 7 16 003000 368.0561 0.9093 0.0200 -0.0763
2005 7 26 020400 368.0533 0.9093 0.0200 -0.0763
2006 8 9 013700 368.0526 0.9093 0.0200 -0.0763
2006 9 16 020700 368.0515 0.9093 0.0200 -0.0763
2005 11 2 000000 368.0484 0.9093 0.0200 -0.0763
2005 12 15 005400 368.0457 0.9093 0.0200 -0.0763
2006 1 19 030300 368.0425 0.9093 0.0200 -0.0763
2006 4 13 013500 368.0401 0.9093 0.0200 -0.0763
2006 7 13 014300 368.0394 0.9093 0.0200 -0.0763

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