Re: Request by Charles David Phillips

From: Björn Gimle via Seesat-l <>
Date: Tue, 24 Jan 2017 16:37:46 +0100
In case you don't see, know how to view, or SeeSat-L doesn't allow
(I don't get my own posts, and on I don't find a link to it)

Björn Gimle, COSPAR 5919
59.2617 N, 18.6169 E, 51 m
Satellite observation formats described:

2017-01-24 11:00 GMT+01:00 Björn Gimle <>:

> Charles posted an observation project in the restricted "So you want to
> see satellites" Facebook group. It relates to possible future breakups of
> DMSP 15,16,17.
> He included a map showing one position and a rather dim partial track.
> Using a recent feature at Heavens-Above I extended it to show full world
> tracks, with extent of surface darkness, and sunlight and shadow along the
> tracks.
> This was made as three images for 02:24 UTC Jan 24 to have surface
> darkness.
> I combined them with PaintShop Pro ("Lightest")
> The tracks are drawn true to the topography. So when F15 passes e.g. South
> African latitude (moving southbound) some 15 minutes after the predicted
> position, the distance from F15 to the morning terminator will be about
> four degrees shorter, and F16 track some 15 minutes before prediction is
> four degrees (400 km) further away as it passed near Cape Town. F17 will
> only be in the E during dawn.
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Received on Tue Jan 24 2017 - 09:38:44 UTC

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