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Table 2
Characteristics of the orbits, acceleration data, and density and crosswind observations. LTAN is the acronym for the local time of the ascending node.
| CHAMP | GRACE A | GRACE B | GRACE C | |
|---|---|---|---|---|
| Initial orbit | ||||
| Semi-major axis | 6823 km | 6869 km | 6869 km | 6870 km |
| Inclination | 87.3° | 89.0° | 89.0° | 88.9° |
| Eccentricity | 0.0029 | 0.0021 | 0.0021 | 0.0011 |
| LTAN progression | −5.44 min/d | −4.47 min/d | −4.47 min/d | −4.53 min/d |
| Initial altitude | 461 km | 506 km | 506 km | 507 km |
| Acceleration data | ||||
| Instrument | STAR | SuperSTAR | SuperSTAR | SuperSTAR-FO |
| Nominal noise level | 1 nm·s−1 | 0.1 nm·s−1 | 0.1 nm·s−1 | 0.1 nm·s−1 |
| Data availability start | 2000-07-29 | 2002-04-04 | 2002-04-04 | 2018-05-29 |
| Data availability end | 2010-09-04 | 2017-10-31 | 2017-05-22 | – |
| Density and crosswind observations | ||||
| Cadence | 10 s | 10 s | 10 s | 10 s |
| Resolution along orbit | 152 km | 422 km | 422 km | 152 km |
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