[Isocops] IBEX Orbit# 236 ATS (9 Feb 14 - 18 Feb 14) - v001 approval
Ken Fairchild
fair-play at comcast.net
Fri Jan 31 00:46:48 EST 2014
All,
I have looked at the orbit 236 ATS,
IBEX_2014_040_o0236a_v001.scr,
and I approve.
There are no constraint violations in
IBEX_2014_040_o0236a_v001.ccvr.
The PL commands in the v001 ATS match those in the v004 STF,
IBEX_2014_040_o0236a_v004.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_040_o0236a_v001.oef,
and as verified with ibex_orbit.
The Hi ABAB command sequences and timing look reasonable.
There is one star tracker outage. It starts about 1 day before apogee and runs for about 3 1/2 days. Some despinning may be required due to this outage.
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_Orbit236Contacts.txt,
for the apogee contact. All other contacts will be blind acquisitions while we are doing Hi ABAB operations.
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 235 left us pointing in safe directions for orbit 236 arc A ascending and descending sequences:
ibex_rotate -o -u 0.774672,-0.535209,-0.336799 -w ibex-sun -t 2014/02:09:21:10:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.774672,-0.535209,-0.336799
which is R.A. +325.360 Decl. -19.682
missing R.A. +323.280 Decl. -14.538 (ibex-sun)
error is R.A. +2.080 Decl. +5.144
for a total 5.515 deg
ibex_rotate -o -u 0.774672,-0.535209,-0.336799 -w ibex-sun -t 2014/02:13:19:27:14
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.774672,-0.535209,-0.336799
which is R.A. +325.360 Decl. -19.682
missing R.A. +327.130 Decl. -13.276 (ibex-sun)
error is R.A. +1.770 Decl. +6.406
for a total 6.626 deg
The sun precession 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 -r +327.202 -d -13.251 -w ibex-sun -t 2014/02:13:21:15:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.818205,-0.527257,-0.229217
which is R.A. +327.202 Decl. -13.251
missing R.A. +327.202 Decl. -13.251 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +327.202 -d -13.251 -w ibex-sun -t 2014/02:13:22:45:28
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.818205,-0.527257,-0.229217
which is R.A. +327.202 Decl. -13.251
missing R.A. +327.262 Decl. -13.230 (ibex-sun)
error is R.A. +0.060 Decl. +0.021
for a total 0.062 deg
ibex_rotate -o -r +327.202 -d -13.251 -w ibex-sun -t 2014/02:17:21:06:55
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.818205,-0.527257,-0.229217
which is R.A. +327.202 Decl. -13.251
missing R.A. +331.026 Decl. -11.856 (ibex-sun)
error is R.A. +3.824 Decl. +1.395
for a total 3.985 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 237 apogee:
ibex_rotate -o -u 0.863639,-0.41579,-0.285036 -w ibex-sun -t 2014/02:17:22:56:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.863639,-0.415790,-0.285036
which is R.A. +334.292 Decl. -16.561
missing R.A. +331.102 Decl. -11.827 (ibex-sun)
error is R.A. +3.190 Decl. +4.734
for a total 5.654 deg
ibex_rotate -o -u 0.863639,-0.41579,-0.285036 -w ibex-sun -t 2014-02-22T19:05:19.303Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.863639,-0.415790,-0.285036
which is R.A. +334.292 Decl. -16.561
missing R.A. +335.817 Decl. -10.106 (ibex-sun)
error is R.A. +1.525 Decl. +6.455
for a total 6.623 deg
Lo O-mode for a 24 hour period in arc B ( plan 6,7,1,1).
There is no overlap with orbit 235 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklists are attached.
Ken
----- Original Message -----
From: "Ibex Mission Operations" <ibexops at gmail.com>
To: joe at boulder.swri.edu, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "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>, "Tim Perry" <perry.tim at orbital.com>, "Harold Kucharek" <Harald.Kucharek at unh.edu>, "Paul Janzen" <Paul.Janzen at mso.umt.edu>
Sent: Tuesday, January 28, 2014 12:42:13 PM
Subject: IBEX Orbit# 236 ATS (9 Feb 14 - 18 Feb 14)
Guys,
Here are the planning products and ATS for Orbit# 236.
Please respond to this email thread with your comments and approvals.
Approvals are required before 31 Jan 14 @1600 UTC
Note the following:
1. Special Ops/Post-LUT Changes
IBEX_Hi negative collimator voltage set to 1400
IBEX_Hi ABAB (CEM comparison)
IBEX_Lo O-mode (cross calibration)
2. Battery Balancing Commands at PERIGEE
SetLongEclipseFlag TRUE $TIME=2014/02:18:09:00:00
SetLongEclipseFlag FALSE $TIME=2014/02:18:10:30:00
3. Sun Maneuver at APOGEE
4. Command Load Constraint Violation Report (CCVR)
# IBEX_2014_040_o0236a_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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