2002-012A
The second ESSP mission is the Gravity Recovery and Climate Experiment (GRACE), a joint NASA/DLR mission. Two GRACE satellites in 450 x 450 km x 90 deg orbits will measure gravity field variations and maintain a 200 km distance. The two satellites, each with a mass of 475 kg, will be launched on a single Rokot rocket in 2001 Jul. The satellites will be built Astrium (Dornier)/Friedrichshafen, and the project is a joint effort between NASA and DLR, run by the U Tex. Austin and GFZ (GeoForschungsZentrum) in Potsdam with project management by JPL. It uses the Astrium FlexBus platform, like CHAMP.
3.1 x 0.77 x 1.9m, 475 kg each, stacked vertically on either side of an MSD (Multi Satellite Dispenser) aboard Briz-M. MSD is built by Krunichev and Astrium RST/Rostock. FM1 and FM2 nicknamed 'Tom' and 'Jerry' during integration.
Sats to be spaced 220 km apart. GRACE 1 swapped with G2 to become the trailing satellite in Dec 2005. Separation was reduced to 70-170 km for one month.
| GRACE 1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 2002 Mar 17 | 0921:27 | Launch by Rokot | PL LC133/1 |
| T+2:16 St 1 sep | |||
| T+3:05 Fairing sep | |||
| T+5:19 St 2 sep | |||
| T+5:19 Bris MES-1 | |||
| 0936:28 | T+15:01 Briz MECO-1 | 300 x 300 x 86.4? | |
| 1042 | T+1:20:38 Briz MES-2 34s | 300 x 500 x 86.4 | |
| T+1:20:54 Briz MECO-2 | |||
| 1047 | T+1:25:38 GRACE sep | 500 x 500 x 90 | |
| T+1:41 CCAM burn | |||
| 2005 Apr 6 | Small inclination diff added | ||
| 2005 Dec 3 | OTM-1 Grace-2 Orbit trim for swap burn at -203 km | ||
| 2005 Dec 10 | 0347 | GR-2 pass GR-1 at 406m | |
| 2005 Dec 12 | GR-2 OTM-2, +58 km, 3.3 km/d | ||
| 2006 Jan 11 | GR-2 OTM-3 at +170 km, 0.5 km/d | ||
| 2017 Dec | Out of prop | ||
| 2017 Dec 13 | Last contact | ||
| 2018 Mar 10 | 0610? | Reentered | |
Payload:
- GPS system
- Microwave intersatellite link
The second ESSP mission is the Gravity Recovery and Climate Experiment (GRACE), a joint NASA/DLR mission. Two GRACE satellites in 450 x 450 km x 90 deg orbits will measure gravity field variations and maintain a 200 km distance. The two satellites, each with a mass of 475 kg, will be launched on a single Rokot rocket in 2001 Jul. The satellites will be built Astrium (Dornier)/Friedrichshafen, and the project is a joint effort between NASA and DLR, run by the U Tex. Austin and GFZ (GeoForschungsZentrum) in Potsdam with project management by JPL. It uses the Astrium FlexBus platform, like CHAMP.
3.1 x 0.77 x 1.9m, 475 kg each, stacked vertically on either side of an MSD (Multi Satellite Dispenser) aboard Briz-M. MSD is built by Krunichev and Astrium RST/Rostock. FM1 and FM2 nicknamed 'Tom' and 'Jerry' during integration.
Sats to be spaced 220 km apart. GRACE 1 swapped with G2 to become the trailing satellite in Dec 2005. Separation was reduced to 70-170 km for one month.
| GRACE 1 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 2002 Mar 17 | 0921:27 | Launch by Rokot | PL LC133/1 |
| T+2:16 St 1 sep | |||
| T+3:05 Fairing | |||
| T+5:19 St 2 sep | |||
| T+5:19 Bris MES-1 | |||
| 0936:28 | T+15:01 Briz MECO-1 | 300 x 300 x 86.4? | |
| 1042 | T+1:20:38 Briz MES-2 34s | 300 x 500 x 86.4 | |
| T+1:20:54 Briz MECO-2 | |||
| 1047 | T+1:25:38 GRACE sep | 500 x 500 x 90 | |
| T+1:41 CCAM burn | |||
| 2005 Apr 6 | Small inclination diff added | ||
| 2005 Dec 3 | OTM-1 Grace-2 Orbit trim for swap burn at -203 km | ||
| 2005 Dec 10 | 0347 | GR-2 pass GR-1 at 406m | |
| 2005 Dec 12 | GR-2 OTM-2, +58 km, 3.3 km/d | ||
| 2006 Jan 11 | GR-2 OTM-3 at +170 km, 0.5 km/d | ||
| 2017 Sep 3 | Partial battery failure | ||
| 2017 Sep 8 | Mission recovered | ||
| 2017 Oct 27? | End of science mission | ||
| 2017 Dec 24 | 0016? | Reentered | |
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