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History of spin (from AO-40 telemetry)



Hi All,

Here's what I found regarding the spin rate of AO-40.  (By the
way the steady increase shown below is NORMAL and was
intentional.  Spin is used to stabilize the spacecraft during
engine burns. Don't anyone say look the spin has been rising
all along!)

2000-11-16 04:06:59    2.6    MA=059
2000-11-16 12:34:03    2.7    MA=241
2000-11-22 22:04:59    4.1    MA=238
2000-11-23 12:36:58    4.1    MA=041
2000-11-24 11:59:47    4.2    MA=035
2000-11-26 09:54:42    5.2    MA=006
2000-11-26 11:07:01    5.4    MA=032
2000-11-27 09:34:54    6.0    MA=006
2000-11-27 20:41:43    5.8    MA=247
2000-11-28 09:13:22    6.0    MA=006
2000-11-28 20:18:05    6.0    MA=246
2000-11-29 10:39:18    6.2    MA=045
2000-11-29 19:55:28    6.0    MA=246
2000-11-30 11:39:37    6.6    MA=074
2000-11-30 19:32:34    6.2    MA=245
2000-12-01 11:31:00    6.6    MA=079
2000-12-01 18:31:46    6.4    MA=231
2000-12-02 12:04:31    6.6    MA=099
2000-12-02 18:28:08    6.6    MA=238
2000-12-03 11:20:42    7.6    MA=091
2000-12-03 17:32:13    7.6    MA=225
2000-12-04 12:09:07    7.9    MA=116
2000-12-04 17:02:02    7.9    MA=222
2000-12-05 11:52:01    7.9    MA=118
2000-12-05 17:23:54    7.9    MA=238
2000-12-06 12:27:38    8.2    MA=139
2000-12-06 16:55:55    7.9    MA=236
2000-12-07 12:32:50    8.8    MA=148
2000-12-08 12:30:45    9.5    MA=155
2000-12-08 21:00:13    9.5    MA=082
2000-12-09 12:52:26    9.9    MA=170
2000-12-10 13:45:05    9.5    MA=197
2000-12-10 20:42:33    9.5    MA=091
2000-12-13 10:24:20    9.5    MA=055
2000-12-13 11:16:52    9.5    MA=067 (last telemetry block)

At this time communications was lost until Dec. 26, 2000.
Telemetry after communications restoration reports spin at
27.3 RPM and is reported to be incorrect.  Measurements by
other means indicate the spin rate is now about 17.4 RPM.

What does this mean?  We can tell at lease one thing from this
data:  That the spin up from 9.5 to 17.4 happened after the
loss of communications, NOT BEFORE.

73's de Rich Burgan @ WC8J


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