Calc Objects that are useful for station
keeping of geostationary satellites. Each Calc Object allows a
choice of a central body. The default is Earth.
| Name |
Dimension |
Type |
Description |
| Time |
DateFormat |
Real Number |
Time. |
| Longitude_Drift_Rate |
AngleRateUnit |
Real Number |
The difference between the mean orbital rate and
the central body rotation rate. The Calc Object allows a choice of
element type (Osculating elements, Kozai-Izsak Mean elements,
Brouwer-Lyddane Mean elements using only short period terms, and
Brouwer-Lyddane Mean elements using both short and long period
terms). The default is osculating. The mean orbital rate is
computing using the element type and accounting for the effects of
J2 of the central body. |
| Mean_Earth_Longitude |
AngleUnit |
Real Number |
Mean longitude, computed in the True Of Date
coordinate system, minus the Greenwich hour angle. Note: this Calc
Object is only valid for the Earth central body. |
| RectifiedLongitude |
AngleUnit |
Real Number |
Two-body rectified longitude with respect to
central body. The rectified motion moves nearly uniformally in true
anomaly. The value is computed by first determining the two-body
orbital elements, re-assigning the true anomaly value to the value
of the mean anomaly, computing the cartesian position using these
modified elements, and then computing the corresponding longitude
from that position. |