SLR CenterofMass (CoM) Measurement Correction Information
The following table shows the components of the satellite bodyfixed 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 satellitestation 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 

ADEOS1  35.6 cm edge hollow cube  1  ?  ?  
ADEOS2  16 cm diameter hemisphere  9  (+5000, +1050, +500)  Yaxis antiparallel with velocity, Zaxis away from nadir 
details 
Ajisai  214 cm diameter sphere  1,436  1028  sphere: radius of phase center of each cube 
details 
BeaconC  Pyramidal array on nadir face 
160  ?  phase center of each cube  
BLITS  85.16 mm diameter sphere  1  (0, 0, 0)  origin at center of the single sphere  details 
CHAMP  5cm diameter, 45 deg pyramid 
4  (0, 0, 250)  Zaxis towards nadir  details 
CryoSat2  11.4 cm diameter, 0 or 57.5 deg pyramid  7  (1808.5, 935.0, 450.0) plus 1525 mm for LRA details 
Xaxis 6° from the flight direction (nosedown), negativeZaxis 6° from the nadir, Yaw steering (normal operation) applied so that Yaxis orthogonal to the satellite ground track 
details 
Envisat  20 cm diameter hemisphere  9  (1058, +1359, 1183)  Xaxis direction of satellite pitch, Zaxis away from nadir 
details 
ERS2  20 cm diameter hemisphere  9  (1000, 710, 1010)  Xaxis direction of satellite pitch, Zaxis away from nadir 

Etalon1, 2  129.4 cm diameter sphere  2,134  614  sphere: radius of phase center of each cube 
details 
Galileo101  33 mm diameter, 23.3 mm height  84  (1092, 34, 621)  Xaxis negative to hemisphere containing the Sun, Yaxis along solar panel, Zaxis towards nadir 
details 
Galileo102  33 mm diameter, 23.3 mm height  84  (1093, 34, 623)  Xaxis negative to hemisphere containing the Sun, Yaxis along solar panel, Zaxis towards nadir 
details 
GFO1  16 cm diameter hemisphere  9  (+182, +753, +599)  Yaxis antiparallel with velocity, Zaxis away from nadir 
details 
GFZ1  20 cm diameter sphere  60  sphere: radius of phase center of each cube 
58 +/ 2  
GIOVEA  30x40 cm planar array  76  (828, 655, +688)  Xaxis negative to hemisphere containing the Sun, Yaxis along solar panel, Zaxis towards nadir, attitude details 
details 
GIOVEB  30x30 cm planar array  67  (804.3, +294.1, +1330.1)  Xaxis negative to hemisphere containing the Sun, Yaxis along solar panel, Zaxis towards nadir, attitude details 
details 
GLONASS  120x120 cm planar array  396  (1542, 0, 0)  Xaxis away from nadir, Yaxis negative to hemisphere containing the Sun, Zaxis along solar panel 

GLONASS  66x66 cm planar array  132  (1555, 0, 0)  Xaxis away from nadir, Yaxis negative to hemisphere containing the Sun, Zaxis along solar panel 

GLONASS  66x66 cm planar array  124  (1522, 0, 0)  Xaxis away from nadir, Yaxis negative to hemisphere containing the Sun, Zaxis along solar panel 

GLONASS95, 99, 100, 102, 109, 115  30x50 cm planar array  112  (1874, 137, +3)  Xaxis away from nadir, Yaxis negative to hemisphere containing the Sun, Zaxis along solar panel 
details 
GLONASS125  annulus array  123  details 

GPS35  23.9x19.4 cm planar array  32  (862.6, 524.5, 669.5)  Xaxis positive to hemisphere containing the Sun, 
details 
GPS36  23.9x19.4 cm planar array  32  (862.6, 524.5, 671.7)  Xaxis positive to hemisphere containing the Sun, Yaxis along solar panel, Zaxis towards nadir 
details 
GRACEA, B  10 cm diameter, 45 deg pyramid 
4  (600, 327.5, 217.8)  Xaxis is the 'front', Zaxis towards nadir, Yaxis completes the orthogonal system  details 
Gravity Probe B  Open hemisphere  9  (0, 0, 1820)  +Zaxis towards RA 343.26deg, DEC 16.84deg  details 
ICESat  16 cm diameter hemisphere  9  (1045, 4, 280) (plus 4.5 cm for the LRA) 
Xaxis towards satellite zenith, Yaxis along solar panel 
details 
Jason1  hemisphere  9  (1171, 598, 6828) (49 mm for the LRA)  Xaxis in direction of velocity, Zaxis towards nadir 
details 
Jason2  hemisphere  9  (1194, 598, 6838) (49 mm for the LRA)  Xaxis in direction of velocity, Zaxis towards nadir 
details 
LAGEOS1  60 cm diameter sphere  426  258  sphere: radius of phase center of each cube 
details 
LAGEOS2  60 cm diameter sphere  426  258  sphere: radius of phase center of each cube 
details 
LARES  36.4 cm diameter sphere  92  137.1  sphere: radius of phase center of each cube  details 
Larets  20 cm diameter sphere  60  56.2  sphere: radius of phase center of each cube 
details 
LRE  quasispherical, 47x51 cm diameter 
126  sphere: radius of phase center of each cube 
210 details 

Meteor3M  spherical ball, 6 cm diameter 
1  (+113, +475.7, +2101.5)  ?  details 
SARAL  hemisphere  9  (4735, 0, 940) (43.4mm for the LRA  Xaxis is nadir pointing, Zaxis opposite to cross track  
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. Xaxis in direction of velocity, Zaxis towards nadir 
details 
WESTPAC  24 cm diameter sphere  60  63.4  Radius of satellite through front face of the cubes (91mm)  details 