Hi all,
Note: Angle at orbit 502 apogee after the perigee sun precession maneuver: 0.299 deg
I have looked at the orbit 502 ATS files: IBEX_2020_269_o0502a_INST_v001.scr, IBEX_2020_269_o0502a_BUS_v001.scr and I approve.
The only constraint violations in IBEX_2020_269_o0502a_INST_v001.ccvr and IBEX_2020_269_o0502a_BUS_v001.ccvr are from the removal of the ACT_SetSpinPulseProtectEnable Enable commands (2); the violations are expected.
The PL commands in IBEX_2020_269_o0502a_INST_v001.scr match those in IBEX_2020_269_o0502a_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_2020_269_o0502a_BUS_v001.oef and as verified
with the crossing times report.
There are two star tracker outages due to the moon. The first one lasts ~52 hours and ends shortly before Apogee on 2020-09-29. The second one is around the 16 Re descending crossing and lasts ~21 hours through perigee on 2020-10-04.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file, IBEX_Orbit502_Contacts.txt for the (4) contacts.
No battery cell balancing.
The inertial precession maneuver at perigee of orbit 501 left us pointing in a safe direction for the orbit 502 arc A ascending and descending sequences:
ibex_rotate -o -u -0.999951,0.007365,-0.006562 -w ibex-sun
-t 2020/09:25:08:55:10
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.999951,+0.007365,-0.006562
which is
R.A. +179.578 Decl.
-0.376
missing
R.A. +182.286 Decl.
-1.009 (ibex-sun)
error is
R.A.
+2.708 Decl.
+0.633
for a total
2.781 deg
ibex_rotate -o -u -0.999951,0.007365,-0.006562 -w ibex-sun -t 2020/09:29:19:00:37
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.999951,+0.007365,-0.006562
which is
R.A. +179.578 Decl.
-0.376
missing
R.A. +186.160 Decl.
-2.649 (ibex-sun)
error is
R.A.
+6.582 Decl.
+2.273
for a total
6.961 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 -0.997212,-0.063858,-0.038615 -w ibex-sun
-t 2020/09:29:20:43:45
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.997212,-0.063858,-0.038615
which is
R.A. +183.664 Decl.
-2.213
missing
R.A. +186.226 Decl.
-2.675 (ibex-sun)
error is
R.A.
+2.562 Decl.
+0.462
for a total
2.601 deg
ibex_rotate -o -u -0.997212,-0.063858,-0.038615 -w ibex-sun
-t 2020/09:29:22:18:51
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.997212,-0.063858,-0.038615
which is
R.A. +183.664 Decl.
-2.213
missing
R.A. +186.286 Decl.
-2.700 (ibex-sun)
error is
R.A.
+2.622 Decl.
+0.487
for a total
2.664 deg
ibex_rotate -o -u -0.997212,-0.063858,-0.038615 -w ibex-sun
-t 2020/10:03:21:55:37
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.997212,-0.063858,-0.038615
which is
R.A. +183.664 Decl.
-2.213
missing
R.A. +190.015 Decl.
-4.301 (ibex-sun)
error is
R.A.
+6.351 Decl.
+2.088
for a total
6.675 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 503 apogee
ibex_rotate -o -r 190.285 -d -4.430 -w ibex-sun -t 2020/10:03:21:55:37
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.980992,-0.178011,-0.077241
which is
R.A. +190.285 Decl.
-4.430
missing
R.A. +190.015 Decl.
-4.301 (ibex-sun)
error is
R.A.
+0.270 Decl.
+0.129
for a total
0.299 deg
ibex_rotate -o -r 190.285 -d -4.430 -w ibex-sun -t 2020/10:08:20:53:12
Quaternion
+0.000000,+0.000000,+0.000000,+0.000000
points axis
+1.000000,+0.000000,+0.000000
towards ECI
-0.980992,-0.178011,-0.077241
which is
R.A. +190.285 Decl.
-4.430
missing
R.A. +194.413 Decl.
-6.146 (ibex-sun)
error is
R.A.
+4.128 Decl.
+1.716
for a total
4.454 deg
There is no overlap with Orbit 501 commands by manual inspection or by checking at http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Carol
--
Carol Weaver
University of New Hampshire
503.902.8492
From: "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com>
Date: Tuesday, 8 September 2020 at 14:51
To: "Weaver, Carol" <Carol.Weaver@unh.edu>, "Chubin, Eric [US] (IS)" <Eric.Chubin@ngc.com>, "Heirtzler, David" <David.Heirtzler@unh.edu>, IBEX FDG <IBEX@applieddefense.info>, IBEXOPS <IBEXOPS@gmail.com>, ISOC <isocops@lists.sr.unh.edu>, Ken Fairchild
<fair-play@comcast.net>, "Ken Fairchild (kwfairchild@gmail.com)" <kwfairchild@gmail.com>, Nigel Angold <angoldconsulting@earthlink.net>, Paul Janzen <paul.janzen@umontana.edu>, "Perry, Timothy E [US] (IS)" <Timothy.Perry@ngc.com>, "Tyler, Ryan S [US] (IS)"
<Ryan.Tyler@ngc.com>, "Wesley, Sheral R [US] (IS)" <Sheral.Wesley@ngc.com>, "Wynn, Reese [US] (IS)" <Reese.Wynn@ngc.com>
Subject: IBEX Orbit #502 ATS Approval (25 Sept 20 - 4 Oct 20)
Caution - External Email
All,
Attached are the planning files for Orbit #502
Please respond to this thread with comments and approvals.
Approvals are required by COB on 10 September 2020
Please note the following:
IBEX_2020_269_o0502a_v001.ccvr
# Input files: 1
# IBEX_2020_269_o0502a_v001.scr
==========================
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 2020/09/25 03:57:39 UTC
IBX-CLC-016: No command to enable spin pulse protection was found after
transition to science mode at 2020/09/29 21:48:51 UTC
==============
OTHER MESSAGES
==============
NO MESSAGES.
Timothy E.Perry
CRS IBEX OCO-2
Mission Operations
timothy.perry@ngc.com
Office (703) 406-5976
Cell (301) 606-1430