Received: from cluster-jaune.cls.fr (cl1-jaune.cls.fr [80.245.34.146]) by sympa.cls.fr (8.13.1/8.13.1) with ESMTP id n1GFLn7r025564 for ; Mon, 16 Feb 2009 15:21:50 GMT Received: by cluster-jaune.cls.fr (Postfix) id 46EF424937; Mon, 16 Feb 2009 15:21:49 +0000 (GMT) Delivered-To: ids.analysis.forum@cls.fr Received: from cluster-d.mailcontrol.com (cluster-d.mailcontrol.com [85.115.60.190]) by cluster-jaune.cls.fr (Postfix) with ESMTP id 5CA16960A6; Mon, 16 Feb 2009 15:21:47 +0000 (GMT) Received: from ndmsnpf01.ndc.nasa.gov (ndmsnpf01.ndc.nasa.gov [198.117.0.121]) by rly10d.srv.mailcontrol.com (MailControl) with ESMTP id n1GFLRLe011081; Mon, 16 Feb 2009 15:21:37 GMT Received: from ndmsppt03.ndc.nasa.gov (ndmsppt03.ndc.nasa.gov [198.117.0.102]) by ndmsnpf01.ndc.nasa.gov (Postfix) with ESMTP id 20792ADA3; Mon, 16 Feb 2009 09:21:26 -0600 (CST) Received: from ndmsxgw04.ndc.nasa.gov (ndmsxgw04.ndc.nasa.gov [129.166.9.162]) by ndmsppt03.ndc.nasa.gov (8.14.1/8.14.1) with ESMTP id n1GFLQQX021820; Mon, 16 Feb 2009 09:21:26 -0600 Received: from NDMSEVS36B.ndc.nasa.gov ([129.166.9.59]) by ndmsxgw04.ndc.nasa.gov with Microsoft SMTPSVC(6.0.3790.3959); Mon, 16 Feb 2009 09:21:24 -0600 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C9904A.3B411A17" Date: Mon, 16 Feb 2009 09:21:25 -0600 Message-ID: <6CBE15DABCBB6E419CD2B50ACBF5B5F7BA8EF2@NDMSEVS36B.ndc.nasa.gov> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Final Orbit Trim Maneuver on Feb 14 Places Jason-1 in Interleaved Orbit Thread-Index: AcmQSjs+cbuWvvfSS1qa44KYnF/npA== From: "Lemoine, Frank G. (GSFC-698.0)" To: Cc: X-OriginalArrivalTime: 16 Feb 2009 15:21:24.0603 (UTC) FILETIME=[3AD8B4B0:01C9904A] X-Mailcontrol-Inbound: j!5LpWEv60HoGC3+4HOWm2hmz2zQyNKrE8YraDX1CupY2S6ijrRmyg== X-Spam-Score: -4.9 X-Scanned-By: MailControl A_08_51_00 (www.mailcontrol.com) on 10.68.0.120 X-Validation-by: frank.g.lemoine@nasa.gov Subject: [ids.analysis.forum] Final Orbit Trim Maneuver on Feb 14 Places Jason-1 in Interleaved Orbit This is a multi-part message in MIME format. ------_=_NextPart_001_01C9904A.3B411A17 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Colleagues- JPL has announced that Jason-1 has concluded the series of orbit change maneuvers that were initiated 2.5 weeks ago. The last of the orbit change maneuvers (as detailed below) occurred on February 14, 2009. Jason-1 is now located in an interleaved orbit with respect to the Jason-2 spacecraft. The altimeter was reactivated on February 10, 2009, and apart from a brief incident with a star tracker that was=20 apparently the result of a single event upset, all systems are nominal. DORIS analysts are cautioned that the South Atlantic Anomaly (SAA) DORIS Correction Model is optimized for Jason-1 in its original (TOPEX) ground track, and that further work=20 is underway by J.M. Lemoine (CNES) and H. Capdeville (CLS) to optimize the model for the new orbit configuration. Best regards, Frank Lemoine Code 698, Planetary Geodynamics Laboratory =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Fifth and Final Jason-1 Orbit Change Maneuver Results: 1st burn: 2009/02/14 at 18:01:49 UTC 2nd burn: 2009/02/14 at 20:45:20 UTC Observed delta-SMA =3D +480 m (+500m targeted); Efficiency: 96%. This placed Jason-1 well within the new station-keeping control box (+/- 1 = km) on=20 14 February 2009 at 20:51 UTC. A routine station-keeping maneuver is planned for 19 February 2009, to cent= er Jason-1=20 within the control box prior to the start of Science Cycle 263. Thank you for your excellent support in these last three weeks! Very best regards. -- Glenn M. Shirtliffe Jason-1 Project Manager ~=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 ------_=_NextPart_001_01C9904A.3B411A17 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Final Orbit Trim Maneuver on Feb 14 Places Jason-1 in Interleaved Or= bit

Dear Colleagues-

JPL has announced that Jason-1 has concluded the series
 of orbit change maneuvers that were initiated 2.5 weeks ago.
The last of the orbit change maneuvers (as detailed below)
occurred on February 14, 2009.

Jason-1 is now located in an interleaved orbit with respect to
the Jason-2 spacecraft. The altimeter was reactivated on February
10, 2009, and apart from a brief incident with a star tracker that was
apparently the result of a single event upset, all systems are nominal.

DORIS analysts are cautioned that the South Atlantic Anomaly
(SAA) DORIS Correction Model is optimized for Jason-1 in
its original (TOPEX) ground track, and that further work
is underway by J.M. Lemoine (CNES)  and H. Capdeville (CLS)
to optimize the model for the new orbit configuration.

Best regards,
Frank Lemoine
Code 698, Planetary Geodynamics Laboratory


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Fifth and Final Jason-1 Orbit Change Maneuver Results:

1st burn:  2009/02/14 at 18:01:49 UTC
2nd burn:  2009/02/14 at 20:45:20 UTC
Observed delta-SMA =3D +480 m  (+500m targeted);  Efficiency: 96%= .

This placed Jason-1 well within the new station-keeping control box (+/- 1 = km) on
14 February 2009 at 20:51 UTC.

A routine station-keeping maneuver is planned for 19 February 2009, to cent= er Jason-1
within the control box prior to the start of Science Cycle 263.

Thank you for your excellent support in these last three weeks!

Very best regards.
--
Glenn M. Shirtliffe
Jason-1 Project Manager
~            &n= bsp;            = ;            &n= bsp;       

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