[Isocops] IBEX Orbit #427 ATS Approval ( 12 - 21 Nov )
Joyce, Colin
Colin.Joyce at unh.edu
Thu Nov 1 15:59:44 EDT 2018
All,
As a correction to my previous email in which I said there were no star tracker outages:
There is one star tracker outage. The outage starts about 2 hours before 15 Re and runs for about 10 hours.
I must have been looking at the wrong file when I checked for this. My apologies for the oversight.
Colin
________________________________
From: Joyce, Colin <Colin.Joyce at unh.edu>
Sent: Tuesday, October 30, 2018 10:51 AM
To: Perry, Timothy; Chubin, Eric; Colin Joyce; David Heirtzler; IBEX-FDG; IBEXOPS; ISOC; Ken Fairchild; Ken Fairchild; Lockwood, Robert; Nigel Angold; Paul Janzen; Tyler, Ryan; Wesley, Sheral; Dreyer, Sean
Subject: Re: IBEX Orbit #427 ATS Approval ( 12 - 21 Nov )
All,
I have looked at the orbit 427 ATS,
IBEX_2018_316_o0427a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2018_316_o0427a_v001_.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2); the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2018_316_o0427a_v002.stf.
Ascending and descending command sequences are consistent with each other, 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF,
IBEX_2018_316_o0427a_v001.oef,
and as verified with ibex_orbit.
There are no star tracker outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_2018_316_o0427a_v001.oef
for all contacts (3).
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 426 left us pointing in safe directions for the orbit 427 arc A ascending and descending sequences:
ibex_rotate -o -u -0.681259,-0.667931,-0.29959 -w ibex-sun -t 2018/11:12:18:11:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.681259,-0.667931,-0.299590
which is R.A. +224.434 Decl. -17.433
missing R.A. +227.626 Decl. -17.783 (ibex-sun)
error is R.A. +3.192 Decl. +0.350
for a total 3.062 deg
ibex_rotate -o -u -0.681259,-0.667931,-0.29959 -w ibex-sun -t 2018/11:16:05:04:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.681259,-0.667931,-0.299590
which is R.A. +224.434 Decl. -17.433
missing R.A. +231.055 Decl. -18.647 (ibex-sun)
error is R.A. +6.621 Decl. +1.214
for a total 6.411 deg
The inertial 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 -u -0.621573,-0.714585,-0.32096 -w ibex-sun -t 2018/11:16:06:47:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.621573,-0.714585,-0.320960
which is R.A. +228.982 Decl. -18.721
missing R.A. +231.128 Decl. -18.664 (ibex-sun)
error is R.A. +2.146 Decl. +0.057
for a total 2.033 deg
ibex_rotate -o -u -0.621573,-0.714585,-0.32096 -w ibex-sun -t 2018/11:16:08:22:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.621573,-0.714585,-0.320960
which is R.A. +228.982 Decl. -18.721
missing R.A. +231.195 Decl. -18.679 (ibex-sun)
error is R.A. +2.213 Decl. +0.042
for a total 2.097 deg
ibex_rotate -o -u -0.621573,-0.714585,-0.32096 -w ibex-sun -t 2018/11:20:15:18:08
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.621573,-0.714585,-0.320960
which is R.A. +228.982 Decl. -18.721
missing R.A. +235.726 Decl. -19.683 (ibex-sun)
error is R.A. +6.744 Decl. +0.962
for a total 6.441 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 428 apogee:
ibex_rotate -o -u -0.559607,-0.756679,-0.338048 -w ibex-sun -t 2018/11:20:17:45:17
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.559607,-0.756679,-0.338048
which is R.A. +233.515 Decl. -19.758
missing R.A. +235.840 Decl. -19.711 (ibex-sun)
error is R.A. +2.325 Decl. +0.047
for a total 2.189 deg
ibex_rotate -o -u -0.559607,-0.756679,-0.338048 -w ibex-sun -t 2018-11-25T15:41:47
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.559607,-0.756679,-0.338048
which is R.A. +233.515 Decl. -19.758
missing R.A. +240.934 Decl. -20.759 (ibex-sun)
error is R.A. +7.419 Decl. +1.001
for a total 7.031 deg
No Lo O-mode.
There is no overlap with orbit 426 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Colin
________________________________
From: Isocops <isocops-bounces at lists.sr.unh.edu> on behalf of Perry, Timothy <Timothy.Perry at OrbitalATK.com>
Sent: Monday, October 29, 2018 5:19 PM
To: Chubin, Eric; Colin Joyce; David Heirtzler; IBEX-FDG; IBEXOPS; ISOC; Ken Fairchild; Ken Fairchild; Lockwood, Robert; Nigel Angold; Paul Janzen; Tyler, Ryan; Wesley, Sheral; Dreyer, Sean
Subject: [Isocops] IBEX Orbit #427 ATS Approval ( 12 - 21 Nov )
All,
Attached are the planning files for Orbit #427.
Please respond to this thread with comments and approvals.
Approvals are required by COB 01 Nov 18.
Note the Following:
1. # Orbit# 427 PERIGEE Battery Balancing
# 2018-11-21T02:54:44.216Z,Perigee,orbit:427
@ECT_SetLongEclipseFlag TRUE $TIME=2018/11:21:02:00:00
@ECT_SetLongEclipseFlag FALSE $TIME=2018/11:21:03:30:00
2. IBEX_2018_316_o0427a_v001_.ccvr
==========================
HARD CONSTRAINT VIOLATIONS
==========================
NO VIOLATIONS.
==========================
SOFT CONSTRAINT VIOLATIONS
==========================
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/11/12 16:31:28 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2018/11/16 07:52:18 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E. Perry
CRS, IBEX, OCO-2 & TESS
Mission Operations
Tim.perry at ngc.com<mailto:Tim.perry at ngc.com>
Office (703) 406-5976
Cell (301) 606-1430
Corp Cell (571) 447-8977
[cid:image002.png at 01D43627.CCEBFFF0]
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*********************
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