Re: Geostationary Eclipse Season and Geosat Flares are here!

From: Bob King via Seesat-l <>
Date: Wed, 21 Feb 2018 23:30:04 -0600

Does anyone have a table showing best viewing dates according to latitude
as I've seen in the past for the autumn eclipse season? It would prove
useful to many, and I'd like to share the news of the season with others.

Thanks for your help.

Best regards,

On Wed, Feb 21, 2018 at 4:15 PM, td Fax via Seesat-l <>

> The Geostationary Eclipse Season (due to Spring Equinox) is nearly upon us.
> From 26 February to 12/13 April,
> the tilt of the Earth will allow the region of the equator opposite the
> Sun,
> to be in the same plane of the Sun intersecting the middle of the Earth,
> allowing the umbra of the Earth's shadow to eclipse the Geostationary
> satellites so high at altitude,which otherwise usually spend all their time
> in direct sunlight.
> From my estimates,
> Pretty much anywhere on the Earth that you can observe Geosats at night:
> The Earth's shadow will pass over the satellites (ideal 0 inclination at
> altitude to remain stationary),
> from the region bounded by Right Ascension(J2000) ~11:30 "hours" RA-9:30
> "hours" RA. [will be a more narrow region base on observing locale]
> Subtract about ~30 "minutes" of RA for each 3 hours of time to adjust RA
> shadow bounds due to shift,
> and add ~10 "minutes" of RA to shadow bounds each day to keep accurate.
> Contingent with this phenomenon is the "Flare Season" as well.
> If anyone is willing to contribute speculations on ideal flare times in
> reference to my estimates, please share.
> I have found a guaranteed flaring from many as they exit the shadow....
> Clear Skies!
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Received on Wed Feb 21 2018 - 23:31:22 UTC

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