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ILRS Mission Priorities as of September, 2006

Priority Mission Sponsor Altitude
(km)		 Inclination
(degrees)		 Comments
1 GRACE-A/B GFZ/JPL 485-500 89 tandem mission*
2 CHAMP GFZ 429-474 87.27  
3 GFO-1 US Navy 790 108.0 altimetry/no other tracking technique
4 Envisat ESA 796 98.6 tandem with ERS-2*
5 ERS-2 ESA 800 98.6 tandem with Envisat*
6 Jason NASA/CNES 1,350 66.0  
7 Larets IPIE 691 98.204 - the effective cross-section is 1.1x10 in 6 m2; - RMS distance error (target error) is < 5 mm; - COM correction is 56.2mm; - satellite brightness in reflected sunlight varies from 8m to 14m depending on phase; - satellite mass is 23.28kg
8 Starlette CNES 815-1,100 49.8  
9 Stella CNES 815 98.6  
10 Ajisai JAXA 1,485 50  
11 LAGEOS-2 ASI/NASA 5625 52.6  
12 LAGEOS-1 NASA 5850 109.8  
13 Beacon-C NASA 950-1300 41 upgraded from a campaign to
ongoing mission (Jan 2002)
14 Etalon-1 Russia 19,100 65.3  
15 Etalon-2 Russia 19,100 65.2  
16 GLONASS-89 Russia 19,100 65 replaced GLONASS86
as of 20 March 2003
17 GLONASS-87 Russia 19,100 65 replaced GLONASS88
as of 20 February 2002
18 GLONASS-95 Russia 19,100 65 replaced GLONASS84
as of 26 August 2005
19 GPS-35 US DoD 20,100 54.2  
20 GPS-36 US DoD 20,100 55.0  
21 GIOVE-A ESA 29,601 56  
22 OICETS JAXA 610 97.83  

Lunar Tracking Priorities

Priority Retroreflector Array Sponsor Altitude(km)
1 Apollo15 NASA 356,400
2 Apollo11 NASA 356,400
3 Apollo14 NASA 356,400
4 Luna21 Russian Federation 356,400
5 Luna17 Russian Federation 356,400