SLR "Center-of-Mass (CoM) Measurement Correction" Information

The following table shows the components of the satellite body-fixed offset of the SLR array phase center (LRA offset: the blue vector in this "SLR center of mass correction" Concept Diagram) in the satellite's coordinate system. The total "SLR center of mass correction" (red vector) should be computed by using the LRA offset vector and the satellite Center of Mass (CoM) offset vector (green vector). The CoM offset may vary slightly with time, depending upon the use of propellant for satellite momentum dumps, satellite orbit maneuvers, antenna orientation changes, et cetera. The "location" of the LRA phase center may also vary; it is the locus of points from which the return came as a result of a particular satellite-station geometry and station characteristics (single or multiple photon, receiver type, et cetera).

Satellite	Size of Array	Number of Reflectors	Body Fixed Coordinates of Array Phase Center (mm)	spacecraft coordinate definition	CoM Correction (mm) and details
ADEOS-1	35.6 cm edge hollow cube	1	?	?
ADEOS-2	16 cm diameter hemisphere	9	(+5000, +1050, +500)	Y-axis anti-parallel with velocity, Z-axis away from nadir	details
Ajisai	214 cm diameter sphere	1,436	1028	sphere: radius of phase center of each cube	details
Beacon-C	Pyramidal array on nadir face	160	?	phase center of each cube
CHAMP	5cm diameter, 45 deg pyramid	4	(0, 0, 250)	Z-axis towards nadir	details
Envisat	20 cm diameter hemisphere	9	(-1058, +1359, -1183)	X-axis direction of satellite pitch, Z-axis away from nadir	details
ERS-2	20 cm diameter hemisphere	9	(1000, -710, -1010)	X-axis direction of satellite pitch, Z-axis away from nadir
Etalon-1, -2	129.4 cm diameter sphere	2,134	614	sphere: radius of phase center of each cube	details
GFO-1	16 cm diameter hemisphere	9	(+182, +753, +599)	Y-axis anti-parallel with velocity, Z-axis away from nadir	details
GFZ-1	20 cm diameter sphere	60		sphere: radius of phase center of each cube	58 +/- 2
GIOVE-A	30x40 cm planar array	76	(-828, -655, +688)	X-axis negative to hemisphere containing the Sun, Y-axis along solar panel, Z-axis towards nadir, attitude details	details
GLONASS	120x120 cm planar array	396	(-1542, 0, 0)	X-axis away from nadir, Y-axis negative to hemisphere containing the Sun, Z-axis along solar panel
GLONASS	66x66 cm planar array	132	(-1555, 0, 0)	X-axis away from nadir, Y-axis negative to hemisphere containing the Sun, Z-axis along solar panel
GLONASS	66x66 cm planar array	124	(-1522, 0, 0)	X-axis away from nadir, Y-axis negative to hemisphere containing the Sun, Z-axis along solar panel
GLONASS-95	66x66 cm planar array	112	(-1874, -137, +3)	X-axis away from nadir, Y-axis negative to hemisphere containing the Sun, Z-axis along solar panel	details
GPS-35	23.9x19.4 cm planar array	32	(862.6, -524.5, 669.5)	X-axis positive to hemisphere containing the Sun, Y-axis along solar panel, Z-axis towards nadir	details
GPS-36	23.9x19.4 cm planar array	32	(862.6, -524.5, 671.7)	X-axis positive to hemisphere containing the Sun, Y-axis along solar panel, Z-axis towards nadir	details
GRACE-A, -B	5cm diameter, 45 deg pyramid	4	(-0.600, -0.3275, 0.2178)	X-axis is the 'front', Z-axis towards nadir, Y-axis completes the orthogonal system	details
Gravity Probe B	Open hemisphere	9	(0, 0, -1820)	+Z-axis towards RA 343.26deg, DEC 16.84deg	details
ICESat	16 cm diameter hemisphere	9	(-1.045, -0.004, 0.280) (plus 4.5 cm for the LRA)	X-axis towards satellite zenith, Y-axis along solar panel	details
Jason-1	hemisphere	9	(236, 598, 683)	X-axis in direction of velocity, Z-axis towards nadir	details
LAGEOS-1	60 cm diameter sphere	426	258	sphere: radius of phase center of each cube	details
LAGEOS-2	60 cm diameter sphere	426	258	sphere: radius of phase center of each cube	details
Larets	20 cm diameter sphere	60	58	sphere: radius of phase center of each cube	58 +/- 2
LRE	quasi-spherical, 47x51 cm diameter	126		sphere: radius of phase center of each cube	210 details
Meteor-3M	spherical ball, 6 cm diameter	1	(+113, +475.7, +2101.5)	?	details
Starlette	24 cm diameter sphere	60		sphere: radius of phase center of each cube	75 details
Stella	24 cm diameter sphere	60		sphere: radius of phase center of each cube	75
TOPEX/Poseidon	150 cm diameter annulus	192	(+1079, +418, +827)	Center of annulus. X-axis in direction of velocity, Z-axis towards nadir	details