From: Kentaro Motohara (kmotohara@ioa.s.u-tokyo.ac.jp)
Date: Thu Nov 21 2002 - 18:35:05 PST
Dear all,
Unfortunately, a stepping motor to drive the one of
two filter wheels failed at the beginning of the night of
11/19.
I tried to recover it by changing the driver, modifying the
torque,,, done everything possible, but it never came back
and seems to be broken.
Because it is a cryostatic motor, we have to warm up CISCO
and open the dewar which takes more than a week.
We therefore gave up observation...
I really feel sorry for the misfortune of this run.
By the way, we have done quick-analysis and compiled about 4hours
of data.
In the resulting image, which is quite dirty due to the stray light,
SN-071 have detected in S/N=5 level.
I hope we can get somehow higher S/N like 8-10 using the
whole data, employing careful reduction.
I'll start that after I come back from the seeing-monitor
campaign at Atacama, and complete it by next January.
Cheers,
Kentaro.
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Kentaro Motohara
Research Associate
Institute of Astronomy, University of Tokyo
2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
kmotohara@ioa.s.u-tokyo.ac.jp
Tel: +1-81-422-34-5049 Fax: +1-81-422-34-5041
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