2018-012B
Yahsat satellite with Ka-band payload. Orbital Geostar-3.
Flight VA241 took off on time, but headed on entirely the wrong launch azimuth, and the rocket delivered the payloads to a 20 degree inclination orbit instead of the planned 3 degree one. Because of the incorrect trajectory, ground controllers lost telemetry around the time of ESC-A ignition, leading to fears the mission was entirely lost - but the satellites were later found in orbits with the correct apogee and perigee, and the wrong inclination.
The investigation report confirms that a single wrong number was responsible for the incorrect orbit achieved by Ariane V241/L5101. The inertial reference system was aligned at the usual 90 degrees azimuth, but for this mission - targeted at a slightly different transfer orbit than usual - 70 degrees should have been specified.
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| SES-14 |
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| Date | Time | Event | Orbit |
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| 2018 Jan 25 | 2220 | Launch by Ariane 5ECA L5101 | CSG ELA3 |
| | | T+0:07 Liftoff |
| | | T+2:19 EAP sep |
| | | T+3:18 Fairing sep |
| | | T+8:51 EPC MECO |
| | | T+8:58 EPC sep |
| | 2229 | T+9:01 ESC-A burn |
| | 2244 | T+24:46 ESC-A MECO |
| | 2247 | T+27:05 SES-14 sep |
| | 2253 | T+33:22 SYLDA sep |
| | 2255 | T+35:07 Al Yah 3 sep |
| 2018 Jan 26 | | | 780.28 231 x 43164 x 20.7 |
| 2018 Feb 1 | 1540 | LAM-1, at apogee 48 m/s ? | 789.42 677 x 43155 x 20.0 |
| 2018 Feb 7 | 0807 | LAM-2 at 34000 km 528 m/s? | 1009.90 6141 x 47790 x 21.5 |
| 2018 Feb 10 | 1245 | LAM 3 at 44170 km 631 m/s? | 1202.1 14973 x 47192 x 9.3 |
| 2018 Feb 13 | 0051 | LAM4 at 44000 km 266 m/s? | 1350.92 20923 x 47281 x 6.2 |
| 2018 Feb 15 | | | 1348.08 20828 x 47263 x 6.2 |
| 2018 Feb 15 | | | 1415.75 23343 x 47524 x 5.6 |
| 2018 Feb 22 | | | 1415.75 23344 x 47430 x 5.5 GEO 150.9W + 5.2E/d |
| 2018 Feb 27 | | | 1440.46 24245 x 47499 x 5.2 |
| 2018 Mar 5 | | | 1447,44 255225 x 46792 x |
| 2018 Mar 16 | | | 1452.53 27504 x 44710 x 3.8 GEO 158.5W-4.1W/d |
| 2018 Apr 13 | | | 1454.68 33757 x 38541 x 1.1 |
| 2018 Apr 24 | | | 1439.92 35855 x 35867 x 0.1 GEO 14.4W+1.0W/d |
| 2018 Apr 30 | | | 1438.78 35812 x 35866 x 0.1 GEO 19.3W+0.7W/d |
| 2018 May 2 | | On station | 1436.10 35780 x 35792 x 0.1 GEO 20.1W |
| 2018 May 9 | | | 1436.11 35783 x 35791 x 0.0 GEO 20.1W |
| 2018 Jun 7 | | | 1436.05 35777 x 35794 x 0.0 GEO 20.1W |