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 (Apr 2, 2001)

Priority Mission Sponsor Altitude
(km)		 Inclination
(degrees)		 Comments
1 CHAMP GFZ 429-474 87.27 launched 15 July 2000
2 GFO1 US Navy 790 108.0 Altimetry/no other tracking technique
3 ERS2 ESA 800 98.6 Altimetry/PRARE
4 TOPEX/
Poseidon		 NASA/CNES 1,350 66.0 Altimetry/DORIS and GPS
5 Starlette CNES 815-1,100 49.8  
6 WESTPAC WPLTN 835 98  
7 Stella CNES 815 98.6  
8 BeaconC NASA 950-1300 41 Campaign through 31 December 2001
9 Ajisai NASDA 1,485 50  
10 LAGEOS2 ASI/NASA 5625 52.6  
11 LAGEOS1 NASA 5850 109.8  
12 GLONASS80 Russian
Federation		 19,100 65 replaced GLONASS70
as of 20 October 1999
13 GLONASS78 Russian
Federation		 19,100 65 replaced GLONASS72
as of 29 June 2000
14 GLONASS84 Russian
Federation		 19,100 65 replaced GLONASS79
as of 22 Feburary 2001
15 GPS35 US DoD 20,100 54.2  
16 GPS36 US DoD 20,100 55.0  
17 Etalon1 Russian
Federation		 19,100 65.3  
18 Etalon2 Russian
Federation		 19,100 65.2  

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