Hey All,
Could someone provide to me the Earth's two
shadow edge points at the Clarke Orbit for Feb 27 at
4:00UT, 6:40UT, and 8:00 UT in RA and Dec? This is for
+33.069N and -96.768W. And if I could be so pushy,
could I also have those 12 numbers for tonight, Feb 28
at those same times?
I'm seeing a very interesting geosat flare
phenomena. With the earth's shadow chord length so
short on across the Clarke Orbit (Geosat flare season
began at 16:28UT Feb 26 by my calculations) there is
an opportunity for geosats to be directly below or
above the anti-solar point and *not be eclipsed* by
the earth's shadow - only when the anti-solar RA has
moved an hour beyond (or before) local midnite.
I watched at 8UT Feb 27 (1hour and 20min after my
local midnite) the XM constellation light up just as
the anti-solar RA passed through them. I belive the
earth's shadow was much farther to the right (west)
then I had expected. This was spectacular! I've gotten
a picture of two of these satellites flaring before,
but I looked up and saw 4 or 5 of them within 15 arc
minutes - all visible without binocs! Thanks for any
help with these 12 (or 24!) numbers.
Regards,
Jeff Umbarger
Plano, TX USA
CST (GMT-6)
P.S.: I will be following up shortly with my seasonal
geosat flare graphical calculator (if I can bug Kevin
to host this again! Sorry Kevin!)
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