Orbital and Technical Parameters

Reference Constellation Orbital Parameters 1

Satellite SV ID Slot Semi-Major Axis (Km) Eccentricity Inclination (deg) RAAN (deg)2 Arg. Perigee (deg)2 Mean Anomaly (deg)2,3
Nominal Slots
GSAT0101 E11 B05 29599.8 0.0 56.0 77.632 0.0 15.153
GSAT0102 E12 B06 29599.8 0.0 56.0 77.632 0.0 60.153
GSAT0103 E19 C04 29599.8 0.0 56.0 197.632 0.0 345.153
GSAT0104 E20 C05 29599.8 0.0 56.0 197.632 0.0 30.153
GSAT0203 E26 B08 29599.8 0.0 56.0 77.632 0.0 150.153
GSAT0204 E22 B03 29599.8 0.0 56.0 77.632 0.0 285.153
GSAT0205 E24 A08 29599.8 0.0 56.0 317.632 0.0 135.153
GSAT0206 E30 A05 29599.8 0.0 56.0 317.632 0.0 0.153
GSAT0208 E08 C07 29599.8 0.0 56.0 197.632 0.0 120.153
GSAT0209 E09 C02 29599.8 0.0 56.0 197.632 0.0 255.153
GSAT0210 E01 A02 29599.8 0.0 56.0 317.632 0.0 225.153
GSAT0211 E02 A06 29599.8 0.0 56.0 317.632 0.0 45.153
GSAT0207 E07 C06 29599.8 0.0 56.0 197.632 0.0 75.153
GSAT0212 E03 C08 29599.8 0.0 56.0 197.632 0.0 165.153
GSAT0213 E04 C03 29599.8 0.0 56.0 197.6316 0.0 300.153
GSAT0214 E05 C01 29599.8 0.0 56.0 197.632 0.0 210.153
GSAT0215 E21 A03 29599.8 0.0 56.0 317.632 0.0 270.153
GSAT0216 E25 A07 29599.8 0.0 56.0 317.632 0.0 90.153
GSAT0217 E27 A04 29599.8 0.0 56.0 317.632 0.0 315.153
GSAT0218 E31 A01 29599.8 0.0 56.0 317.632 0.0 180.153
GSAT0219 E36 B04 29599.8 0.0 56.0 77.632 0.0 330.153
GSAT0220 E13 B01 29599.8 0.0 56.0 77.632 0.0 195.153
GSAT0221 E15 B02 29599.8 0.0 56.0 77.632 0.0 105.153
GSAT0222 E33 B07 29599.8 0.0 56.0 77.632 0.0 240.153
Extended Slots
GSAT0201 E18 Ext01 27977.6 0.162 49.850 52.521 56.198 316.069
GSAT0202 E14 Ext02 27977.6 0.162 49.850 52.521 56.198 136.069

1: Reference date for the constellation is 2016-11-21 00:00:00 UTC4. The table shows a snapshot of the reference orbit at the given epoch. The reference orbit for a different epoch can be computed following the note 2. Occasionally the table might be consistently updated to a different epoch, for example when introducing new satellites. The reference orbit indicated corresponds to the final orbital slot within the constellation.

2: The above table provides values for the given UTC epoch. The reference RAAN, argument of perigee and Mean Anomaly are dynamic parameters, the other are static. To calculate the values for other epoch, users are advised to use a linear extrapolation for the RAAN, argument of perigee and the Mean Anomaly with the following temporal rates: 

Reference parameter rates Nominal slots Extended slots
d(RAAN)/dt -0.02764398 deg/day -0.03986760 deg/day
d(Arg. peri)/dt 0.00000000 deg/day 0.03383184 deg/day
d(Mean Anomaly)/dt 613.72253566 deg/day 667.86467481 deg/day
 
3: True anomaly (υ) and mean anomaly (M) are related through the eccentric anomaly and the Kepler’s equation. The true anomaly can be also solved from the mean anomaly by using a series expansion approach of the so-called equation of the center. For reference orbit computation the series solution can be truncated in the following terms:
Note that for circular orbits (eccentricity =0) both mean and true anomalies are identical.
 
Source: ESA
 
4: ISO-8601 Date and time format