[Isocops] IBEX Orbit# 218 ATS (28 Aug 13 - 7 Sept 13) - v001 approval
fair-play at comcast.net
fair-play at comcast.net
Sat Aug 17 15:25:25 EDT 2013
All,
I have looked at the orbit 218 ATS,
IBEX_2013_240_o0218a_v001.scr,
and I approve.
There are no constraint violations in
IBEX_2013_240_o0218a_v001.ccvr.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2013_240_o0218a_v002.stf.
Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF file,
IBEX_2013_240_o0218a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. It starts about 45 minutes before perigee and ends about 4 1/2 hours after perigee. No despinning should be required due to this outage.
There is one short moon in Lo FOV session in arc A. The session is only about 48 minutes long and the start and stop events do not appear in the OEF.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit218Contacts.txt,
for all contacts (2).
We are doing battery cell balancing this orbit and the balancing commands are correct and offset by enough time from other commands.
The inertial maneuver at perigee of orbit 217 left us pointing in safe directions for orbit 218 arc A ascending and descending sequences:
ibex_rotate -o -u -0.892247,0.418168,0.170381 -w ibex-sun -t 2013/08:29:07:12:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.892248,+0.418168,+0.170381
which is R.A. +154.889 Decl. +9.810
missing R.A. +157.677 Decl. +9.348 (ibex-sun)
error is R.A. +2.788 Decl. +0.462
for a total 2.788 deg
ibex_rotate -o -u -0.892247,0.418168,0.170381 -w ibex-sun -t 2013/09:01:23:18:56
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.892248,+0.418168,+0.170381
which is R.A. +154.889 Decl. +9.810
missing R.A. +160.998 Decl. +7.998 (ibex-sun)
error is R.A. +6.109 Decl. +1.812
for a total 6.302 deg
The inertial maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for arc B ascending and descending sequences:
ibex_rotate -o -u -0.924259,0.354142,0.142577 -w ibex-sun -t 2013/09:02:01:02:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.924259,+0.354142,+0.142577
which is R.A. +159.035 Decl. +8.197
missing R.A. +161.064 Decl. +7.971 (ibex-sun)
error is R.A. +2.029 Decl. +0.226
for a total 2.022 deg
ibex_rotate -o -u -0.924259,0.354142,0.142577 -w ibex-sun -t 2013/09:02:02:37:10
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.924259,+0.354142,+0.142577
which is R.A. +159.035 Decl. +8.197
missing R.A. +161.125 Decl. +7.947 (ibex-sun)
error is R.A. +2.090 Decl. +0.250
for a total 2.085 deg
ibex_rotate -o -u -0.924259,0.354142,0.142577 -w ibex-sun -t 2013/09:06:14:37:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.924259,+0.354142,+0.142577
which is R.A. +159.035 Decl. +8.197
missing R.A. +165.272 Decl. +6.292 (ibex-sun)
error is R.A. +6.237 Decl. +1.905
for a total 6.474 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 219 apogee:
ibex_rotate -o -u -0.951794,0.285262,0.112752 -w ibex-sun -t 2013/09:06:16:38:37
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.951794,+0.285262,+0.112752
which is R.A. +163.316 Decl. +6.474
missing R.A. +165.347 Decl. +6.262 (ibex-sun)
error is R.A. +2.031 Decl. +0.212
for a total 2.030 deg
ibex_rotate -o -u -0.951794,0.285262,0.112752 -w ibex-sun -t 2013-09-11T16:01:21.957Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.951794,+0.285262,+0.112752
which is R.A. +163.316 Decl. +6.474
missing R.A. +169.733 Decl. +4.383 (ibex-sun)
error is R.A. +6.417 Decl. +2.091
for a total 6.721 deg
No Lo O-mode.
There is no overlap with orbit 217 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi .
Command Approval Checklist is attached.
Ken
----- Original Message -----
From: "Ibex Mission Operations" <ibexops at gmail.com>
To: "Bret Hautamaki" <hautamaki.bret at orbital.com>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com>
Sent: Wednesday, August 14, 2013 9:57:58 PM
Subject: [Isocops] IBEX Orbit# 218 ATS (28 Aug 13 - 7 Sept 13)
Guys,
Here are the planning files and ATS for ORbit# 218.
All comments,questions and approvals are required before 18 Aug 13 @1400 UTC.
Please respond to this email thread with your comments, questions and approvals.
--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
(304) 279-6678
Please restrict discussions on this email list to non-ITAR sensitive topics.
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