NASA will be performing network maintenance on Thursday, February 6, 2025, between 9:00 AM EST and 11:00 AM EST (14:00 to 16:00 UTC). There will be a few short periods of disruption. During these periods, the ILRS website will be unavailable. If you experience problems outside this window, contact support-cddis@nasa.gov.

close window
com navigation structure general satellite info ilrs support retroreflector info center of mass site performance info

GLONASS

Center of Mass Information:

For the GLONASS satellites equipped with the 120 cm x 120 cm array (those launched before 1996), limited CoM information is available.

GLONASS-84 uses a different RRA than the other GLONASS satellites. GLONASS-84 has 132 corner cubes (132 cube arrangement). The corner cubes are mounted within a circular area having a 330-mm radius. Two (GLONASS-86, -87) of the three GLONASS satellites launched on December 1, 2001 (GLONASS-86, -87, -88) have the same array as GLONASS-84, but one (GLONASS-88) has a different array of only 124 cubes (124 cube arrangement).

Analysis has been done on the GLONASS retroreflector array position relative to CoM for the newer satellites GLONASS-87, -89, -95, -99, -100, -102, -109, and -115. The CoM correction values for the GLONASS-K satellites (GLONASS-125) are also available.