[Isocops] IBEX Orbit# 248 ATS Approval (30 May 14 - 8 Jun 14) - v001 approval
Ken Fairchild
fair-play at comcast.net
Mon May 19 02:22:16 EDT 2014
All,
I have looked at the orbit 248 ATS,
IBEX_2014_149_o0248a_v001.scr,
and I approve.
There are no constraint violations in
IBEX_2014_149_o0248a_v001.ccvr.
The PL commands in the v001 ATS match those in the v003 STF,
IBEX_2014_149_o0248a_v003.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,
IBEX_2014_149_o0248a_v001.oef,
and as verified with ibex_orbit.
The Hi ABAB command sequences and timing look reasonable.
There is one star tracker outage in arc B. It starts 3 3/4 hours before 15 Re descending and runs for 10+ hours. Some despinning may be required due to this outage.
There is one moon in Lo FOV session in arc B. The ATS start time is about 1 1/2 hours after that in the OEF and the ATS end time is about 3 1/2 hours before that in the OEF. These differences are not unusual.
The ground station command sequence is correct and the timing and bit rate match those in the contacts file,
IBEX_Orbit248Contacts.txt,
for the apogee contact. All other contacts will be blind acquisitions.
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 247 left us pointing in safe directions for the orbit 248 arc A ascending and descending sequences:
ibex_rotate -o -u 0.407394,0.841798,0.354128 -w ibex-sun -t 2014/05:30:07:17:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.407394,+0.841798,+0.354128
which is R.A. +64.175 Decl. +20.740
missing R.A. +66.868 Decl. +21.733 (ibex-sun)
error is R.A. +2.693 Decl. +0.993
for a total 2.700 deg
ibex_rotate -o -u 0.407394,0.841798,0.354128 -w ibex-sun -t 2014/06:03:01:45:20
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.407394,+0.841798,+0.354128
which is R.A. +64.175 Decl. +20.740
missing R.A. +70.855 Decl. +22.237 (ibex-sun)
error is R.A. +6.680 Decl. +1.497
for a total 6.393 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 0.334706,0.86854,0.365527 -w ibex-sun -t 2014/06:03:03:28:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.334706,+0.868540,+0.365527
which is R.A. +68.925 Decl. +21.440
missing R.A. +70.930 Decl. +22.246 (ibex-sun)
error is R.A. +2.005 Decl. +0.806
for a total 2.028 deg
ibex_rotate -o -u 0.334706,0.86854,0.365527 -w ibex-sun -t 2014/06:03:05:03:34
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.334706,+0.868540,+0.365527
which is R.A. +68.925 Decl. +21.440
missing R.A. +70.998 Decl. +22.254 (ibex-sun)
error is R.A. +2.073 Decl. +0.814
for a total 2.090 deg
ibex_rotate -o -u 0.334706,0.86854,0.365527 -w ibex-sun -t 2014/06:07:18:45:48
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.334706,+0.868540,+0.365527
which is R.A. +68.925 Decl. +21.440
missing R.A. +75.613 Decl. +22.786 (ibex-sun)
error is R.A. +6.688 Decl. +1.346
for a total 6.340 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 249 apogee:
ibex_rotate -o -u 0.258682,0.890156,0.375108 -w ibex-sun -t 2014/06:08:02:06:42
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.258682,+0.890156,+0.375108
which is R.A. +73.796 Decl. +22.031
missing R.A. +75.903 Decl. +22.814 (ibex-sun)
error is R.A. +2.107 Decl. +0.783
for a total 2.099 deg
ibex_rotate -o -u 0.258682,0.890156,0.375108 -w ibex-sun -t 2014-06-12T21:30:19.005Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.258682,+0.890156,+0.375108
which is R.A. +73.796 Decl. +22.031
missing R.A. +80.989 Decl. +23.146 (ibex-sun)
error is R.A. +7.193 Decl. +1.115
for a total 6.734 deg
No Lo O-mode.
There is no overlap with orbit 247 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: "Harold Kucharek" <Harald.Kucharek at unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Tim Perry" <perry.tim at orbital.com>
Sent: Sunday, May 18, 2014 3:34:23 AM
Subject: IBEX Orbit# 248 ATS Approval (30 May 14 - 8 Jun 14)
Guys,
Here are the planning files and ATS for Orbit# 248.
Please respond to this email thread with your questions and approvals.
Approvals are required before 19 May 14 @2200 UTC
Note the following:
1. Battery Balancing at Perigee
ECT_SetLongEclipseFlag TRUE $TIME=2014/06:08:06:00:00
ECT_SetLongEclipseFlag FALSE $TIME=2014/06:08:07:30:00
2. Moon in Lo FOV
2014-06-04T20:41:44.662Z,MoonInLoFovStart,orbit:248
2014-06-06T01:54:14.827Z,MoonInLoFovStop,orbit:248
--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
CYGNUS Mission Planning
(304) 279-6678
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