Mobile version



Jason-1 was launched on December 7, 2001. The Jason-1 Launch vehicle is a Boeing Delta II 7920. The Delta vehicle is shared with another Nasa mission, Timed, with Jason-1 separated first. The launch site is Vandenberg Air Force Base. Its lifespan, announced for 5 years is already exceeded and the current capacities of the satellite still let forecast good performances.

Still developed jointly by Cnes and Nasa, Jason-1 is the follow-on of Topex-Poseidon. Jason-1 is a mini-satellite, based on the Proteus multimission spacecraft bus. All its instruments derive from Topex/Poseidon but limiting their weight and their consumption of energy. Its unchanged orbit, compared to that of Topex/Poseidon allows a continuous acquisition of measurements and thus, further our understanding of many ocean phenomena on the long term.

A new concept of satellite control and data processing operations were developed in order to deliver near-real time measurements to an international user community for operational oceanography.

The user community thus has an important role to play in sustaining the mission's success in the years ahead through the Jason series of satellites.

Satellite  Jason-1
Launch on  07/12/2001
End Date  01/07/2013
Altitude  1336 km
Inclination  66 °
Repetitivity  9.9156 days
Agency  Cnes/Nasa
Goals  Measure sea surface height

From the launch of OSTM/Jason-2, in June 2008, the both satellites Jason-1 and OSTM/Jason-2 had one-minute shift (55 seconds, exactly). On mid-February, 2009 (cycle 262), Jason-1 assumed a new orbit midway between its original ground tracks but with a time lag of approximately 5 days with OSTM/Jason-2. In other words, the start time of the Jason-1 and OSTM/Jason-2 repeat cycles differs by approximately 5 days. This new tandem configuration better suits for real-time applications. The former Topex/Poseidon ground tracks are now overflown by OSTM/Jason-2.

After having encountered an anomaly at the end of February 2012 and early in March 2012, Jason-1 was in Safe Hold Mode. Cnes and Nasa management, through the Joint Steering Group, have directed the Jason-1 Project to begin a series of maneuvers to reduce the orbit on a geodetic orbit at 1324.0 km. This orbit is drifting orbit with a cycle 406 days and some sub-cycles of 3.9 - 10.9 - 47.5 - 179.5 days (see details on new orbit parameters).

Contact was lost with the Jason-1 spacecraft on 21 June 2013. At the time of the last contact, the spacecraft its payload instruments were in nominal health and there were no indications of any alarms or anomalies. All attempts to re-establish communications with the Jason-1 spacecraft over the ten days from 21 June to 01 July, from both US and French ground stations, were unsuccessful.  
Jason-1 was passivated and decommissioned on 01 July 2013, terminating the Jason-1 mission after 11.5 years of operations (see the official announcement written by Nasa/JPL and Cnes on July 2013).  

Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

This home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!