A bit of colour

According to my satellite tracker this one is likely to have been Cosmos 338. I found it notable because of its distinctly reddish colour.
An enlargement of the trail seems to indicate the red component might be a series of erratic pulses but whether this is just a result of the photographic process or something else needs clarifying.

animated gif. 3.28mb
Lens 40mm. 20 second exposures
(click thumbnail for large version)

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