Re: Chandra IPS-1 Visibility

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It depends on what the burn is suppose to do. If the burn is raising the
perigee, then it would occur during apogee. It's in a 24+ hr orbit so about
12hr before perigee it would be at apogee. If it's at perigee around
14:13UT, then it should be near apogee around 2:13 UT which is near the 2:23
UT time given for the burn.

Bill Bard

----------
>From: Ron Lee <ronlee@pcisys.net>
>To: SeeSat-L@blackadder.lmsal.com
>Subject: Chandra IPS-1 Visibility
>Date: Sat, Jul 24, 1999, 1:54 PM
>

>Chandra
>1 25867U 99040B   99204.55311668 -.00000050  00000-0  10000-3 0    68
>2 25867  28.5826 196.7564 8422595 269.7720   6.5176  0.97132965    26
>
>ASSUMING I have made no mistakes, I get a perigee at around 14:13 UT on
>25 Jul 99.  This occurs basically south of Rio de Janeiro while that
>region is in daylight.  Thus the IPS-1 burn will not be visible.
>
>However, other data indicates the IPS-1 burn should occur around 2:23 UT
>on 25 Jul so I do not understand the discrepancy.  I assumed the burn
>would occur at perigee.
>
>Ron Lee
>

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