EUROPEAN SPACE AGENCY
EUROPEAN SPACE OPERATIONS CENTRE
GROUND SYSTEMS ENGINEERING DEPARTMENT
Mission Analysis Office
CLASSIFICATION OF GEOSYNCHRONOUS OBJECTS
ISSUE 9
by J.P. Arregui and R. Jehn
Produced with the DISCOS Database
February 2007 ESOC RobertBoschStr. 5, 64293 Darmstadt, Germany
<<< Contents
3. Table 1: objects with recently updated orbital elements
This table contains all objects with recently updated orbital elements. The objects are ordered according to the following criteria:
 Status C1, then according to the ascending order of longitude of station keeping.
 Status C2, then according to the ascending order of longitude of station keeping.
 Status D, then according to the ascending order of the mean drift rate (which is equivalent to the
decreasing order of the mean semimajor axis).
 Status L1, then according to the ascending order of the libration period (which is equivalent to the
ascending order of the libration magnitude).
 Status L2, then according to the ascending order of the libration period (which is equivalent to the
ascending order of the libration magnitude).
 Status L3, then according to the ascending order of the libration period (which is equivalent to the
ascending order of the libration magnitude).
The following symbols are used:
 nn: is the reference number.
 COSPAR: is the COSPAR identification.
 Name: is the object's common name.
 Date: is the epoch of the last available TLE.
 λ: is the mean longitude of the satellite (in degrees).
 λ': is the mean drift of the satellite (in deg/days).
 Δa: is the difference between the satellite's mean semimajor axis and the geostationary semimajor axis (in km).
 Δr_{p}: is the perigee mean deviation from the geostationary altitude (in km).
 Δr_{a}: is the apogee mean deviation from the geostationary altitude (in km).
 P_{lib}: is the libration period (in days).
 Δλ: is the libration magnitude (in degrees): Δλ=λ_{max}  λ_{min}
 λ_{min}: is the minimum longitude of the libration (in degrees).
 λ_{max}: is the maximum longitude of the libration (in degrees).
 N_{ly}: is the number of TwoLine Elements stored during the last 52 weeks.
 N_{tot}: is the total number of TwoLine Elements available for this object.
 MJD: is the Modified Julian Date (number of days since 01Jan1950) corresponding to "Date"
 a, e, i, Ω, ω and λ are the last values of the satellite's semimajor axis (in km), eccentricity,
inclination (in degrees), rightascension of the ascending node (in degrees), perigee argument (in
degrees) and longitude (in degrees).
