RE: LightSail-A: preliminary post-sail deployment elements

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Fri, 5 Jun 2015 16:45:03 -0400
To my knowledge, LightSail-A remains silent.

The day 155.85 TLE reveals nearly triple the rate of decay of previous ones:

1 90726U          15155.85200928  .00035016  00000-0  92537-3 0   237
2 90726  55.0139 274.2324 0247742 219.2976 293.0495 15.12624279  2301

1 90726U          15154.58498645  .00012439  00000-0  33532-3 0   213
2 90726  55.0069 279.7147 0249269 215.8824 234.0970 15.12547949  2116

1 90726U          15153.52983294  .00012439  00000-0  33507-3 0   194
2 90726  55.0066 284.2825 0249551 213.3011 248.6791 15.12520450  1953

1 90726U          15152.53796228  .00011977  00000-0  32335-3 0   175
2 90726  55.0066 288.5747 0249604 210.9055 247.9006 15.12492924  1802

These is little change in the decay terms of the other cubesats, which leads me to believe that we may be seeing the
effects of LightSail's solar panel deployment, which would have increased its area to mass ratio. Deployment was
commanded at day 153.506944. It is not unusual for such small orbit changes to take a few days to be fully manifested in
TLEs.

Ted Molczan


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Received on Fri Jun 05 2015 - 15:45:46 UTC

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