Period of USA 144 decoy brightness variation

Hi all,

I used yesterday's imagery of the USA 144 decoy to derive a period for its 
brightness variation.

Fitting a simple sinusoid, I get a period of 50.5 +/- 0.5 seconds. This is 
shorter than the periods I determined in 2009 and 2010.

Curve here:

http://sattrackcam.blogspot.nl/2015/09/the-slow-changing-tumble-of-usa-144.html

- Marco


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Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
e-mail: sattrackcam_at_langbroek.org

Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL
Station (b)log: http://sattrackcam.blogspot.com
Twitter: _at_Marco_Langbroek
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