[Isocops] IBEX Orbit #549 ATS Approval (25 Nov – 04 Dec, 2021) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Mon Nov 15 20:25:00 EST 2021
All,
Note: Angle at perigee after the apogee sun precession maneuver: 4.148 deg
I have looked at the orbit 549 ATS,
IBEX_2021_329_o0549a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2021_329_o0549a_v001.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the eclipse; the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2021_329_o0549a_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_2021_329_o0549a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts 1+ day after 15 Re ascending and runs for about 2.5 days. The second starts at apogee and runs for 1- days. Some despinning may be required due to these outages.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit549_Contacts.txt,
for all contacts (3).
There is an eclipse near perigee so we aren't doing battery cell balancing. The timing of the long eclipse flag commands matches Ryan's recommendations.
The inertial precession maneuver at perigee of orbit 548 leaves us pointing in safe directions for the orbit 549 arc A ascending and descending sequences:
ibex_rotate -o -u -0.495239,-0.793472,-0.353752 -w ibex-sun -t 2021/11:25:14:24:26
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.495239,-0.793472,-0.353752
which is R.A. +238.030 Decl. -20.717
missing R.A. +241.232 Decl. -20.827 (ibex-sun)
error is R.A. +3.202 Decl. +0.110
for a total 2.996 deg
ibex_rotate -o -u -0.495239,-0.793472,-0.353752 -w ibex-sun -t 2021/11:29:15:19:04
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.495239,-0.793472,-0.353752
which is R.A. +238.030 Decl. -20.717
missing R.A. +245.490 Decl. -21.514 (ibex-sun)
error is R.A. +7.460 Decl. +0.797
for a total 7.004 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 +245.569 -d -21.526 -w ibex-sun -t 2021/11:29:17:07:12
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.384749,-0.846956,-0.366923
which is R.A. +245.569 Decl. -21.526
missing R.A. +245.569 Decl. -21.526 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +245.569 -d -21.526 -w ibex-sun -t 2021/11:29:18:37:18
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.384749,-0.846956,-0.366923
which is R.A. +245.569 Decl. -21.526
missing R.A. +245.635 Decl. -21.535 (ibex-sun)
error is R.A. +0.066 Decl. +0.009
for a total 0.062 deg
ibex_rotate -o -r +245.569 -d -21.526 -w ibex-sun -t 2021/12:03:19:15:29
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.384749,-0.846956,-0.366923
which is R.A. +245.569 Decl. -21.526
missing R.A. +249.988 Decl. -22.146 (ibex-sun)
error is R.A. +4.419 Decl. +0.620
for a total 4.148 deg
The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 550 apogee:
ibex_rotate -o -u -0.320209,-0.865499,-0.385197 -w ibex-sun -t 2021/12:03:22:20:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.320209,-0.865499,-0.385197
which is R.A. +249.697 Decl. -22.656
missing R.A. +250.135 Decl. -22.170 (ibex-sun)
error is R.A. +0.438 Decl. +0.486
for a total 0.632 deg
ibex_rotate -o -u -0.320209,-0.865499,-0.385197 -w ibex-sun -t 2021-12-08T18:35:57.914Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI -0.320209,-0.865499,-0.385197
which is R.A. +249.697 Decl. -22.656
missing R.A. +255.428 Decl. -22.748 (ibex-sun)
error is R.A. +5.731 Decl. +0.092
for a total 5.288 deg
Lo Normal mode for the entire orbit.
There is no overlap with orbit 548 commands (except for a contact) by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On 11/12/2021 4:44 PM Perry, Timothy E [US] (SP) <timothy.perry at ngc.com> wrote:
>
>
>
> All,
>
> Attached are the planning files for Orbit #549. Please respond to this thread with comments and approvals.
>
> Approvals are required by COB, 14 Nov 2021
>
>
> Please note the following:
>
> 1. Apogee Sun Maneuver - 2021/11:29:16:52:1
>
>
> 2. Orbit 549 Moderate Eclipse
>
> 2021-12-04T02:58:43.472Z,EclipseEntry,moderate:true,long:false,orbit:549
>
> 2021-12-04T04:24:07.735Z,EclipseExit,moderate:true,long:false,orbit:549
>
> Begin 2021/12/04 01:00:00– End 2021/12/04 04:50:00
>
>
> 3. Command Load Constraint Violation Report (CCVR)
>
> IBEX_2021_329_o0549a_v001.ccvr
>
> Input files: 1
>
> # IBEX_2021_329_o0549a_v001.scr
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-015: Battery charge falls below minimum from 2021/12/04 04:50:00 UTC -
>
> 2021/12/04 13:02:00 UTC. Lowest charge level is 0.000000
>
> watt-minutes during this interval.
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2021/11/25 12:00:44 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2021/11/29 18:07:18 UTC
>
>
> ==============
>
> OTHER MESSAGES
>
> ==============
>
> NO MESSAGES.
>
>
>
>
> Timothy E.Perry
>
> CRS IBEX OCO-2
>
> Mission Operations
>
> timothy.perry at ngc.com
>
> Office (703) 406-5976
>
> Cell (301) 606-1430
>
>
>
> [cid:image001.png at 01D542D6.6047A400]
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20211115/7e32dc9e/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 5047 bytes
Desc: not available
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20211115/7e32dc9e/image001-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IBEX-Command-Approval-Checklist-Rev16g-o0549_KWF.doc
Type: application/msword
Size: 119296 bytes
Desc: not available
URL: <https://lists.sr.unh.edu/pipermail/isocops/attachments/20211115/7e32dc9e/IBEX-Command-Approval-Checklist-Rev16g-o0549_KWF-0001.doc>
More information about the Isocops
mailing list