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Posted by baalke on September 12, 2005, 8:03 am
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http://www.isas.ac.jp/e/snews/2005/0912.shtml
Hayabusa arrives Itokawa
JAXA
September 12, 2005
Hayabusa arrived Itokawa on 10:00 am, 12 Sep (JST: Japanese Standard
Time). Now Hayabusa hovers around 20 kilometers away from asteroid
Itokawa.
[Itokawa Image]
This picture was taken at 8:35 am, 12 Sep (JST) just before the
settlement by the visible imager AMICA. Field of view is two degrees.
The photo shows contrast of rocky and hilly region and smooth area,
which may suggest the origin of this asteroid. This feature may be a
key
to consider Itokawa?s origin and evolution.
The scientific observation will be conducted for about two months
including sampling and topographic measurement.
Color composite image will be available soon.
The figure below shows the Doppler velocity difference between Itokawa
and Hayabusa. The velocity dropped down to zero around 01:17 UTC. It
indicates that Hayabusa fired its chemical propulsion thruster so that
the relative velocity was canceled. Vertically approaching speed is
taken in km/sec and is shown the doubled speed corresponding to a round
trip measurement. Horizontally is shown the Universal Time (World Time:
UTC) when the Doppler information was collected. Since radio travels
for
about 17 minutes from Hayabusa, the last firing occurred around 01:17
UTC. The resulted relative velocity was confirmed down to about 0.25
mm/sec.
[Doppler Data]
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