NASA will be performing network maintenance on Thursday, July 25, 2024, from 09:00 AM EDT (13:00 UTC) to 11:00 AM EDT (15:00 UTC). The ILRS website and ALL CDDIS services will be unavailable during the maintenance window. If you experience problems outside this window, contact support-cddis@earthdata.nasa.gov.

close window
-->

ILRS Mission Priorities as of November, 2003

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 GFO1 US Navy 790 108.0 altimetry/no other tracking technique
4 ENVISAT ESA 796 98.6 tandem with ERS-2*
5 ERS2 ESA 800 98.6 tandem with ENVISAT*
6 Jason NASA/CNES 1,350 66.0 tandem with Topex*
7 TOPEX/
Poseidon		 NASA/CNES 1,350 66.0 tandem with Jason*
8 Starlette CNES 815-1,100 49.8  
9 Stella CNES 815 98.6  
10 METEOR-3M IPIE 1000 99.64 No other tracking technique
11 Beacon C NASA 950-1300 41 upgraded from a campaign to
ongoing mission (Jan 2002)
12 Ajisai JAXA 1,485 50  
13 LAGEOS2 ASI/NASA 5625 52.6  
14 LAGEOS1 NASA 5850 109.8  
15 Etalon1 Russian
Federation		 19,100 65.3  
16 Etalon2 Russian
Federation		 19,100 65.2  
17 GLONASS89 Russian
Federation		 19,100 65 replaced GLONASS86
as of 20 March 2003
18 GLONASS87 Russian
Federation		 19,100 65 replaced GLONASS88
as of 20 February 2002
19 GLONASS84 Russian
Federation		 19,100 65 replaced GLONASS79
as of 22 Feburary 2001
20 GPS35 US DoD 20,100 54.2  
21 GPS36 US DoD 20,100 55.0  

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