Latest Data From IMAGE Indicates Spacecraft's Power Functional
by Miles Hatfield for GSFC News
Greenbelt MD (SPX) Feb 06, 2018
New data regarding IMAGE provides some additional - though not yet complete - information on how the spacecraft began to transmit signals again.
On Thanksgiving Day in 2004, the IMAGE spacecraft - at that time still fully functioning - underwent an unexpected power distribution reboot, after which the power returned only on one side - labeled the B side - of the unit. (Satellites are usually built with redundant hardware, often called "A sides" and "B sides." In the event one half fails, operators can switch to the other with minimal effect to the mission.) Scientists involved in the mission concluded that the A side had failed, and proceeded for the rest of the mission exclusively with the B side.
However, data from today's telemetry with IMAGE indicate that the spacecraft's power unit is now operating back on its A side. The ultimate cause of the reboot is still not known, but these recent findings suggest that a reboot in some form has, in fact, occurred.
Feb. 5, 2018, Update
During this process of inspecting the spacecraft, there are several puzzles that the team is investigating to better understand the spacecraft's health and how best to communicate with it, including:
What caused the spacecraft to reboot and begin sending signal again?
Why is one side of the on-board electronics working and not the other? We are currently communicating with IMAGE through the original A side of the on-board electronics. The A side was thought to have failed in 2004, when the communications were switched to the redundant B side. How and why the A side is now working is something we are looking at.
As we move forward, NASA is starting to recreate a small control center that can generate the commanding needed to better understand and control the satellite. This will then allow us to gain insights into the state of various science instruments, and see whether any are still functional. Should any of the instruments be functional, NASA will convene a panel of external scientists to assess the science potential in the context of constrained budgets for operating spacecraft.
Jan. 30, 2018, Update
On the afternoon of Jan. 30, the Johns Hopkins Applied Physics Lab in Laurel, Maryland, successfully collected telemetry data from the satellite. The signal showed that the space craft ID was 166 - the ID for IMAGE.
The NASA team has been able to read some basic housekeeping data from the spacecraft, suggesting that at least the main control system is operational.
Scientists and engineers at NASA's Goddard Space Flight Center in Greenbelt, Maryland, will continue to try to analyze the data from the spacecraft to learn more about the state of the spacecraft. This process will take a week or two to complete as it requires attempting to adapt old software and databases of information to more modern systems.
Jan. 29, 2018, Update
Seeking to ascertain whether the signal indeed came from IMAGE, NASA's Goddard Space Flight Center in Greenbelt, Maryland, coordinated the use of five separate antennas to acquire radio frequency signals from the object.
As of Monday, Jan. 29, observations from all five sites were consistent with the radio frequency characteristics expected of IMAGE. Specifically, the radio frequency showed a spike at the expected center frequency, as well as side bands where they should be for IMAGE. Oscillation of the signal was also consistent with the last known spin rate for IMAGE.
To confirm beyond doubt that the satellite is IMAGE, NASA will next attempt to capture and analyze data from the signal. The challenge to decoding the signal is primarily technical. The types of hardware and operating systems used in the IMAGE Mission Operations Center no longer exist, and other systems have been updated several versions beyond what they were at the time, requiring significant reverse-engineering.
If data decoding is successful, NASA will seek to turn on the science payload - currently turned off - to understand the status of the various science instruments. Pending the outcome of these activities, NASA will decide on how to proceed.
IMAGE was designed to image Earth's magnetosphere and produce the first comprehensive global images of the plasma populations in this region. After successfully completing and extending its initial two-year mission in 2002, the satellite unexpectedly failed to make contact on a routine pass on Dec. 18, 2005. After a 2007 eclipse failed to induce a reboot, the mission was declared over.
Contact with lost NASA satellite IMAGE confirmed
Greenbelt MD (SPX) Jan 31, 2018
The identity of the satellite re-discovered on Jan. 20, 2018, has been confirmed as NASA's IMAGE satellite. On the afternoon of Jan. 30, the Johns Hopkins Applied Physics Lab in Laurel, Maryland, successfully collected telemetry data from the satellite. The signal showed that the space craft ID was 166 - the ID for IMAGE. The NASA team has been able to read some basic housekeeping data from the spacecraft, suggesting that at least the main control system is operational. Scientists and ... read more
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