[Isocops] IBEX Orbit# 246 ATS (11 May 14 - 20 May 14) - v001 approval
Ken Fairchild
fair-play at comcast.net
Wed Apr 30 15:25:18 EDT 2014
All,
I have looked at the orbit 246 ATS,
IBEX_2014_131_o0246a_v001.scr,
and I approve.
There are no constraint violations in
IBEX_2014_131_o0246a_v001.ccvr.
The PL commands in the v001 ATS match those in the v003 STF,
IBEX_2014_131_o0246a_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_131_o0246a_v001.oef,
and as verified with ibex_orbit.
The Hi ABAB command sequences and timing look reasonable.
There are two star tracker outages in arc B. The first starts about 15 hours after apogee and ends 2+ days later. The second starts about a day after the first one ends and runs until 13 Re descending (thus delaying the perigee maneuver). Some despinning may be required due to these outages.
There are no moon in Lo FOV sessions.
The ground station command sequence is correct and the timing and bit rate match those in the contacts file,
IBEX_Orbit246Contacts.txt,
for the apogee contact. All other contacts will be blind acquisitions.
No battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 245 left us pointing in safe directions for the orbit 246 arc A ascending and descending sequences:
ibex_rotate -o -u 0.667048,0.687428,0.28721 -w ibex-sun -t 2014/05:11:20:01:53
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.667048,+0.687428,+0.287210
which is R.A. +45.862 Decl. +16.691
missing R.A. +48.403 Decl. +17.960 (ibex-sun)
error is R.A. +2.541 Decl. +1.269
for a total 2.738 deg
ibex_rotate -o -u 0.667048,0.687428,0.28721 -w ibex-sun -t 2014/05:15:11:57:11
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.667048,+0.687428,+0.287210
which is R.A. +45.862 Decl. +16.691
missing R.A. +52.135 Decl. +18.858 (ibex-sun)
error is R.A. +6.273 Decl. +2.167
for a total 6.354 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 0.607355,0.732837,0.306709 -w ibex-sun -t 2014/05:15:13:40:19
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.607355,+0.732837,+0.306709
which is R.A. +50.349 Decl. +17.861
missing R.A. +52.206 Decl. +18.876 (ibex-sun)
error is R.A. +1.857 Decl. +1.015
for a total 2.034 deg
ibex_rotate -o -u 0.607355,0.732837,0.306709 -w ibex-sun -t 2014/05:15:15:15:25
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.607355,+0.732837,+0.306709
which is R.A. +50.349 Decl. +17.861
missing R.A. +52.272 Decl. +18.891 (ibex-sun)
error is R.A. +1.923 Decl. +1.030
for a total 2.095 deg
ibex_rotate -o -u 0.607355,0.732837,0.306709 -w ibex-sun -t 2014/05:20:02:37:00
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.607355,+0.732837,+0.306709
which is R.A. +50.349 Decl. +17.861
missing R.A. +56.596 Decl. +19.904 (ibex-sun)
error is R.A. +6.247 Decl. +2.043
for a total 6.253 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 247 apogee:
ibex_rotate -o -u 0.543598,0.773979,0.324743 -w ibex-sun -t 2014/05:20:07:08:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.543598,+0.773979,+0.324743
which is R.A. +54.918 Decl. +18.950
missing R.A. +56.772 Decl. +19.942 (ibex-sun)
error is R.A. +1.854 Decl. +0.992
for a total 2.010 deg
ibex_rotate -o -u 0.543598,0.773979,0.324743 -w ibex-sun -t 2014/05:25:05:04:43
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.543598,+0.773979,+0.324743
which is R.A. +54.918 Decl. +18.950
missing R.A. +61.840 Decl. +20.884 (ibex-sun)
error is R.A. +6.922 Decl. +1.934
for a total 6.788 deg
No Lo O-mode.
There is no overlap with orbit 245 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: Monday, April 28, 2014 12:16:09 PM
Subject: IBEX Orbit# 246 ATS (11 May 14 - 20 May 14)
Guys,
Here are the planning files and ATS for Orbit# 246.
Please respond to this email thread with your comments and ATS approvals.
All approvals are required before 1 May 14 @1200 UTC
Please note the following:
1. No battery balancing commands this orbit
2. Special Ops/Post-LUT Changes
Hi negative collimator voltage set to 1400
Hi ABAB (CEM comparison)
3. Command Load Constraint Violation Report (CCVR)
IBEX_2014_131_o0246a_v001.scr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==============
OTHER MESSAGES
==============
NO MESSAGES.
--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
CYGNUS Mission Planning
(304) 279-6678
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