.com.unity Forums - Solar Sail I almost complete!

News release by the PS.

The Planetary Society continues to investigate the mystery of what happened to its Cosmos 1 spacecraft - a joint project with Cosmos Studios - that launched last week on a Russian Volna rocket. While the Volna failed to place the spacecraft in its intended orbit, some data indicates the solar sail spacecraft may have made it to a lower orbit.

Cosmos 1 was the first solar sail spacecraft, designed to sail on light, using photons for propulsion in Earth orbit.

The manufacturer of the rocket, Makeev Rocket Design Bureau, stated that
the first stage of the rocket fired improperly and prematurely shut down,
sending the entire vehicle - rocket and payload - into the Barents Sea
after a flight of only several hundred kilometers. However, Cosmos 1
scientists at the Space Research Institute (IKI) in Moscow and at The
Planetary Society have been analyzing signals received at ground stations
after the launch to determine if they have come from the spacecraft,
perhaps in a low orbit.

Dr. Viacheslav Linkin, project Science Manager from IKI, stated, "It
appears almost certain that we have received signals from the spacecraft
after it was injected into orbit."

The IKI team is continuing to review the data and provide additional
calibration measurements to rule out other possible sources for the
signals.

"We have scientists in both the US and Russia looking at the signals," said
Louis Friedman, the Project Director and Executive Director of The
Planetary Society, "and a strong case can be made that at least some of the
signals are from the spacecraft."

Friedman cited, as the strongest example, a measurement of Doppler shift in
the frequency of the signal from the Kamchatka tracking station which
correlated very well with the magnitude and time of the planned orbit
insertion motor firing.

Other data received at Panska Ves, in the Czech Republic, and in Majuro,
the Marshall Islands, were less convincing, but still correlated well with
planned spacecraft transmissions. The Panska Ves signal, although noisy,
even shows an apparent response to a ground command sent to the spacecraft
during the first orbit.

"We cannot be certain this data is from the spacecraft," said Dr. Gregory
Delory of the University of California Space Sciences Laboratory. "It is
very noisy, but it does correlate well with known spacecraft information,
and other possible explanations are not as compelling," he added. Delory
led The Planetary Society Data Analysis team.

Friedman noted that if a spacecraft signal were received from orbit, it
would contradict the report that the spacecraft did not separate from the
rocket. If Cosmos 1 did go into orbit, it most likely was one that was too
low to be sustained, and the spacecraft would have quickly re-entered the
atmosphere. The fact that the US Strategic Command apparently did not
observe the spacecraft indicates that its orbital lifetime would have been
short, perhaps only hours.

"During the launch sequence," he said, "we were informed by a launch team
member that first stage separation had occurred. Later, however, we were
told by Lavochkin Association flight controllers that this was a mistake,
and that the separation had not occurred."

The Russian government will organize a commission to investigate the
accident.

Friedman concluded, "The lack of data from the launch trajectory makes it
hard to know what happened to the spacecraft. Knowing that the spacecraft
actually began working in orbit would help The Planetary Society team
determine its next steps in planning a new solar sail mission."

LAUNCH VIDEO: Launch video is available on The Planetary Society's website
at http://planetary.org/solarsail/launch_video.html and may be requested
on DVD for broadcast purposes.