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TOPIC: HAYABUSA (MUSES-C) mission
Blobrana


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RE: HAYABUSA (MUSES-C) mission
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At around 10:30 JST, Prof. Matogawa addressed the media.

"In about 10 minutes we expect the first telemetry data from Hayabusa. The press conference originally scheduled at noon would have to be cancelled. The project manager prof. Kawaguchi would also like to postpone it until tomorrow.
The result of the analysis of what happened has to wait until tomorrow. Once we receive the telemetry, we will know whether it touched down, impactor has been ejected, and such. We will let you know the status immediately. I would like prof. Kawaguchi to concentrate on his operation. Telemetry will arrive in every 40 minutes. I think I will give you the briefing in every hour or so.
There were some speculations about why Hayabusa did not go into safe mode. While it was trying to touch down, it somehow hovered at a certain altitude (about 10 m) for a half-hour. Hayabusa's movement was closely monitored by two-way Doppler signal but no shift has been observed.
We speculated the temperature of Hayabusa went up considerably. The communication circuit might have experienced some kind of anomaly.
It seems reasonable we re-established the communication once Hayabusa moved away from Itokawa"

About the velocity monitoring with Doppler shift.

"There are two methods, one is one-way Doppler shift using Hayabusa's signal, and two-way Doppler shift by measuring the response to the signal sent from Earth. Frequency of the signal from Hayabusa varies as the temperature of the communication circuit changes. Therefore we could not precisely measure the velocity without calibrations in one-way Doppler. To measure the velocity at a few cm/s, we need two-way Doppler"

"We still don't know whether it touched down or not. Hayabusa did go into the safe mode. We also know it now hovers further away from the home position. Hayabusa is now in safe mode, stabilising itself with a gentle spin, with its solar array facing to the sun. Medium gain antenna transmits signal with an 18 degrees cone. We receive the house keeping data only when the Earth is within its cone. Hayabusa is broadcasting its house keeping data with medium gain antenna repeatedly.
We don't know why it entered into the safe mode. It is not clear whether it received the safe mode command from Earth or not. Hayabusa has an option of going into the safe mode from its autonomous mode. This could also be the case.
Low gain antenna transmits the signal into every direction. So we didn't know Hayabusa was rotating. It was not before we received the signal from medium gain antenna that we realised it is rotating.
Usuda station ends contact with Hayabusa around 14:55. We plan to establish the 3-axis attitude control before the contact through Usuda ends.
We hold the next DSN station, Madrid, Spain, from 17:25 to 22:00. After the next is Usuda, from 08:30 tomorrow morning to 14:55. We would like to establish the attitude control this afternoon.
Our current goals are 1) establish the attitude control and 2) attempt to go back to Itokawa again. We are evaluating which goal to perform and when"

The next briefing will be around 16:00 JST, (7:00 GMT, 20 November 2005), when Usuda station ends contact with Hayabusa.

-- Edited by Blobrana at 07:29, 2005-11-20

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Blobrana


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Mission control has confirmed that Hayabusa released the targetmarker at 5:46 (JST), (20:46 GMT 19 November)


This is an image captured at 4:58 JST just after the target marker was released.

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Blobrana


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Mission control has confirmed that the laser range finder indicated an of attitude 17m. at 5:55 (JST), (20:55 GMT 19 November)

Mission control has also confirmed that Hayabusa is not in safe-mode.


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Blobrana


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Two way communication using telemetry mode on the low gain antenna was established at 9:32 JST (00:32 GMT).

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Blobrana


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According to Prof. Yasunori Matogawa, Associate Executive Director, Public Affairs Office, JAXA, the mission operators are still receiving signals from the spacecraft.
Hayabusa is not on Itokawa but hovering near Itokawa.

Mission control are trying to establish a two way communication link, using the low gain antenna, normally used for Doppler measurement to receive telemetry data from Hayabusa.

They have sent the command to change to that communication (telemetry mode) mode from beacon mode to the spacecraft.

-- Edited by Blobrana at 00:41, 2005-11-20

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Blobrana


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At 9:00 JST or 10:00 JST (01:00 GMT), A JAXA press conference will be made.

Live stream from mission control.

-- Edited by Blobrana at 23:58, 2005-11-19

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Blobrana


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It has been confirmed that Hayabusa has released the target marker

However, Prof. Matogawa from JAXA/ISAS has said that Operators can not confirm ascending.

The signal from Hayabusa has been picked up.
Hayabusa descended in autonomous mode.
The laser range finder on Hayabusa indicated attitude 17m. After that, descending has stopped. But Hayabusa did not begin ascending.

About 7:00 JST, Mission Operators sent an ascending command, and a command for it to go into safe-mode.

Mission operators are trying to work out what happened.

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Blobrana


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Ground station swap over occurred at 6:37 (JST), from NASA Goldstone station to Usuda station. Operater can not get the telemetory data from Hayabusa.

Confirmation of landing still to be made.

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Blobrana


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After landing the space probe will fire a small metal ball at the space rock’s surface at very high speed.
Hayabusa’s horn-shaped sampling device will collect fragments of the asteroid within a canister attached at the top of the horn.

After a brief Touch-down at 6:00(JST), Hayabusa will retreat to a higher altitude above Itokawa.
Another sampling manoeuvre is slated for November 25.


Artist’s concept of Japan’s Hayabusa spacecraft touching down on the asteroid to start sampling operations.
Image Courtesy: Space Robotics Lab/Tohoku University

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Blobrana


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Surface of itokawa.

To mark the landing, Hayabusa will drop a 10-centimetre metal ball that contains the names of 880,000 people from 149 countries. The names, which are written in the people's native languages, are of respondents to a worldwide offer made by the agency three years ago.

Along with the names of the lifetime honorary manager of the Yomiuri Giants and the U.S. film director, comic artist Reiji Matsumoto and actor Paul Newman also are listed. A special technique used in semiconductor manufacturing was used to engrave the names on aluminium foil in the metal ball.

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