****************************************************************************** dorismail 30-Jul-2018 08:52:15 Message No 1128 ****************************************************************************** Author: Ferrage Pascale Subject: DORIS DATA availability during last Jason-2 Safe Hold Mode (July Dear colleague, data to IDS data Centers are as follows: Jason-2 was in Safe Hold Mode (SHM) between 2018/07/18 09:00 TU to 2018/0= 7/25 at 08:30 TU due to a gyro #1 disjunction and is back to operations (s= ee Christophe's message below). the impacts on the dissemination of DORIS data to the IDS Data Centers (IGN= /CDDIS) are as follows: - The DORIS DORIS system was ON, but the DORIS1B data and the DORIS orbi= ts were not delivered. - The DORIS DATA (in RINEX format) were still disseminated to IDS as well= as the solar panel / attitude quaternions files. But note that their qual= ity was degraded because of the SHM and the non-nominal attitude law. Best regards, Pascale Ferrage ___________________________________________________________________________= ________ De : Marechal Christophe Envoy=E9 : mercredi 25 juillet 2018 16:09 =C0 : Marechal Christophe ; ostst@jpl.nasa.gov Cc : Aviso CRM Objet : Jason-2 back to operations Dear OSTST Members, From today at 08:30UTC Jason-2 spacecraft is back to operations. The first = OGDRs could be generated around 10:45UTC. It is now starting its measurements on the i-LRO orbit, on cycle 600. Very best regards. Christophe Marechal, CNES Jason 2 project manager on behalf of Jason-2 proj= ect managers from NOAA, EUMETSAT and JPL. ________________________________________________________________________ De : Marechal Christophe > Envoy=E9 : mercredi 18 juillet 2018 18:03 =C0 : ostst@jpl.nasa.gov Cc : Aviso CRM > Objet : [Jason-2] Safe Hold Mode Dear OSTST Members, The Jason-2 spacecraft entered safe mode today (Wednesday, July 18th) at 09= :00UTC, immediately interrupting its measurements. The satellite is currently in a safe and stable Sun-pointing configuration.= The analysis of the telemetry shows that the safe hold mode is consecutive= to a gyro #1 disjunction. Those anomalies are now known and, as decided du= ring last JSG, the reconfiguration of the satellite on gyro#2 started immed= iately. Recovery operations will keep on during the following days, and Jas= on-2 mission is expected to restart nominally next week, hopefully on Wedne= sday, July 25th. The exact time of instruments restart will be communicated= later. As indicated earlier this week, Jason-2 maneuvers have been performed in or= der to place Jason-2 on an "interleaved LRO" orbit, so that more precise re= sults are available for geodetic purpose. Fortunately, the reconfiguration = to safe hold mode has been triggered after the last maneuver, which means J= ason-2 should be ready to provide measurements on cycle 600 (new cycle numb= ering for the i-LRO measurements) right after restart. Very best regards. Christophe Marechal, CNES Jason 2 project manager on behalf of Jason-2 proj= ect managers from NOAA, EUMETSAT and JPL.