ERS-1 Mission Phase C
Phase C parameters
Phase C parameters
- 35 day repeat cycle
- 501 orbits in one cycle
- 8849 orbits in phase
Orbit number characteristics
- First absolute orbit number is: 3901 on 14-apr-92, 06:17:59.431 UTC
- First internal track: 249
- End of the phase: orbit 12749 on 23-dec-93, 10:56:47.575 UTC.
Orbit parameters
- orbit eccentricity: 0.001165
- orbit inclination: 98.5429 deg
- asc. node Long.: 243.0078 deg
- semi-major axis: 7159495.65 m
- mean nodal period: 6035.928143 s
- mean anomaly: 270.1334 deg
- argument of perigee: 90 deg
Formulas from Relative (track) to Absolute Orbit Numbers
ABS_ORB_NUM = REL_ORB_NUM + CYCLE_NUM*501 - 37931
CYCLE_NUM = INT [ ( ABS_ORB_NUM + 37930)/501 ]
REL_ORB_NUM = ABS_ORB_NUM + 37931 - CYCLE_NUM*501
Where:
- the "Absolute Orbit Number" is counted from the beginning of the mission;
- the "Relative Orbit Number" (track), in a given cycle, is counted starting from the first orbit East of Greenwich;
- the "Cycle Number" is increased whenever the track 1 is rivisited (note that cycles can be uncomplete).
This information was retrieved from ESA/ESRIN
