From: Dunham, David
Sent: Friday, October 27, 2006 9:39
PM
To: Driesman, Andy
Cc: Guzman, Jose J.; Reynolds, Ed;
Ossing, Daniel; Sharer, Peter; Strikwerda, Thomas; Adams, Dewey; Eichstedt,
John; Ottenstein, Neil FDF; Joan ai-solutions; Boeing Friesen, Henry D; Boeing
Jim Steer; Boeing Michael Martin; KSC Edwin New; KSC Rex Engelhardt; EXT Hynes,
Shane; Marren, Kristi D.; Beisser, Kerri; KSC Cheryl Malloy
Subject:
RE: Dayside apogee solution for Oct./Nov.?
A note of history - it was just 3 months ago that I
first seriously considered a late October launch for STEREO - see my message of
July 27th below. And now we're actually flying it! There were many
questions, and lots of compressed work, to make it happen. At one point,
it looked like mobile telemetry couldn't be arranged, until we changed our
targeting and fixed the coast times so that all of the critical events could be
observed from Cape Verde and Sao Tome every day of the launch window. And
then there was the cliff hanger arrangements to actually travel to and set up
the mobile telemetry on Cape Verde. Thanks to everyone for taking this
idea, seemingly minor at the time, and expanding it into such a great
success!
David
Andy,
Maybe
a dayside apogee launch window might be developed for Oct./Nov. that would have
very short coasts with CAN AOS, but probably only one opportunity would work for
that; the window would probably be Oct. 18 - Nov. 2. Maybe it's out of the
question due to Themis, but who knows, they have big problems too, I
understand. I'll calculate a trajectory and see if Henry Friesen can use
it, if they can support the short coast needed.
David
Andy,
Peter's
still here and pointed out the problem with the short coast solution for the
mid-October window - it has 120-min. eclipses. So we need to use the long
coast solution that has AOS at Goldstone about 79 min. after launch. The
mid-November window is similar.
David
If you
got no help from Peter and the launch window were the priority, when do you
think the DTO would be ready?
-Andy
PS - I
thought that we had a Goldstone mission for one of our many Mission
Designs?
Andy,
You
wrote and asked (see below):
Dave
- Yup. They are going to destack. Launch date is no earlier than
31 Aug. So if you are doing any work for the early part of the window,
drop it. Concentrate on 31 Aug - 4 Sept.
With
regard to the DTO for Oct 6? - 20?. Boeing states that we can launch two
months after they get a DTO input. So Aug 7 DTO nets an NET Oct 7 lauch
date. We are pushing on Boeing and KSC (to do their review in
parallel).
So:
- Do
you think it is feasible to complete the work on the last 1/2 of the window
and produce the Oct DTO by Aug 7? If not, can we get some more staff
(Peter??) to help.
- - We can do it, but Jose and I can't do both it and
the Aug. 31/Sept. 4 details (COLA, etc.) that others will want. Jose
and I both have been hit with a little work on other projects today as
well. So we would need Peter's help to get both the DTO and at least
the minimum info. for Aug. 31/Sept. 4 that others need. The problem is
that Peter is going on vacation tomorrow and planned to be gone all next
week. If necessary, and from what you say it looks like it is, he
will need to return here early next week, and the rest of his family
would return with others who are also on that trip, but he would prefer not
to do that if possible.
- Does the Oct window still have a Canberra
rise? I believe our Nov (05) window had a Goldstone rise.
- - No, the mid-October window has a Canberra
rise, and that's also the case for mid-November this year, based on the
general information Peter generated several months
ago.
David
Thanks,
Andy