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SLR-Mail No.2067

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Date:2012-04-23 18:09:51
Sender:Frank Lemoine <Frank.G.Lemoine@nasa.gov>
Subject:[SLR-Mail] No.2067: Jason-1 Status Update (April 23, 2012)
Author:Glenn Shirtliffe
Content:********************************************************************************
SLR Electronic Mail 2012-04-24 07:11:06 UTC Message No. 2067
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Author: Glenn Shirtliffe (JPL), Thierry Guinle (CNES)



The Jason-1 project teams at CNES and NASA/JPL have now completed all
prerequisite tasks required to enable a safe recovery of the mission
from the
safe hold it has been in since 3 March 2012.

This morning, on Monday, 23 April, CNES began to command the satellite
into a
nadir orientation and will then begin the restart of payload instruments on
Tuesday, 24 April.

CNES and NASA management, through the Joint Steering Group, have
directed the
Jason-1 Project to then begin a series of maneuvers to reduce the orbit
semi-major axis by 12.6 km. This will place Jason-1 into a new
long-repeat orbit
at roughly 1323.4 km altitude. The exact “geodetic orbit” parameters
will be
forwarded to you in the near future.

If all mission operations proceed as planned and no new anomalies are
encountered, the Project expects to resume Jason-1 science and
operational data
delivery by 4 May 2012.

The move from the altimetry reference orbit has been a difficult
decision to
take, but it also signals the start of an exciting new chapter in the
extraordinary mission of Jason-1.

Very best regards.

Thierry Guinle & Glenn Shirtliffe

CNES & NASA/JPL Jason-1 Project Managers

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