[Isocops] IBEX Orbit #475 ATS Approval ( 23 Jan - 2 Feb 2020 ) - v001 approval
KEN FAIRCHILD
fair-play at comcast.net
Mon Jan 13 20:13:52 EST 2020
All,
I have looked at the orbit 475 ATS,
IBEX_2020_023_o0475a_v001.scr,
and I approve.
The only constraint violations in
IBEX_2020_023_o0475a_v001_.ccvr
are from the removal of the
ACT_SetSpinPulseProtectEnable Enable
commands (2) and the length and proximity of contacts (although some of the warnings appear related to an orbit 474 contact that ends after the start of the orbit 475 ATS); the violations are expected.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2020_023_o0475a_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_023_o0475a_v001.oef,
and as verified with ibex_orbit.
There is one star tracker outage. The outage starts at apogee and runs for 2+ days. Some despinning may be required due to this outage.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit475_Contacts.txt,
for all contacts (4).
We're not doing battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 474 left us pointing in safe directions for the orbit 475 arc A ascending and descending sequences:
ibex_rotate -o -u 0.556953,-0.757923,-0.339641 -w ibex-sun -t 2020/01:23:22:27:21
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.556953,-0.757923,-0.339641
which is R.A. +306.310 Decl. -19.855
missing R.A. +305.422 Decl. -19.478 (ibex-sun)
error is R.A. +0.888 Decl. +0.377
for a total 0.917 deg
ibex_rotate -o -u 0.556953,-0.757923,-0.339641 -w ibex-sun -t 2020/01:27:06:57:22
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.556953,-0.757923,-0.339641
which is R.A. +306.310 Decl. -19.855
missing R.A. +308.964 Decl. -18.631 (ibex-sun)
error is R.A. +2.654 Decl. +1.224
for a total 2.788 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 0.622298,-0.71451,-0.31972 -w ibex-sun -t 2020/01:27:08:40:30
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.622298,-0.714510,-0.319720
which is R.A. +311.054 Decl. -18.646
missing R.A. +309.037 Decl. -18.612 (ibex-sun)
error is R.A. +2.017 Decl. +0.034
for a total 1.912 deg
ibex_rotate -o -u 0.622298,-0.71451,-0.31972 -w ibex-sun -t 2020/01:27:10:15:36
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.622298,-0.714510,-0.319720
which is R.A. +311.054 Decl. -18.646
missing R.A. +309.104 Decl. -18.595 (ibex-sun)
error is R.A. +1.950 Decl. +0.051
for a total 1.849 deg
ibex_rotate -o -u 0.622298,-0.71451,-0.31972 -w ibex-sun -t 2020/02:01:07:30:35
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.622298,-0.714510,-0.319720
which is R.A. +311.054 Decl. -18.646
missing R.A. +314.039 Decl. -17.291 (ibex-sun)
error is R.A. +2.985 Decl. +1.355
for a total 3.146 deg
The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 476 apogee:
ibex_rotate -o -u 0.684385,-0.664862,-0.299291 -w ibex-sun -t 2020/02:01:10:59:33
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.684385,-0.664862,-0.299291
which is R.A. +315.829 Decl. -17.415
missing R.A. +314.194 Decl. -17.256 (ibex-sun)
error is R.A. +1.635 Decl. +0.159
for a total 1.569 deg
ibex_rotate -o -u 0.684385,-0.664862,-0.299291 -w ibex-sun -t 2020-02-06T09:14:53.572Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.684385,-0.664862,-0.299291
which is R.A. +315.829 Decl. -17.415
missing R.A. +319.275 Decl. -15.782 (ibex-sun)
error is R.A. +3.446 Decl. +1.633
for a total 3.684 deg
No Lo O-mode.
There is no overlap with orbit 474 commands by manual inspection or by checking at
http://ibex.unh.edu/cgi-bin/ats.cgi.
Command Approval Checklist is attached.
Ken
> On January 9, 2020 at 12:22 PM "Perry, Timothy E [US] (IS)" <Timothy.Perry at ngc.com> wrote:
>
>
> All,
>
> Attached are the planning files for Orbit #475
>
> Please respond to this thread with comments and approvals.
>
> Approvals are required by COB on 13 Jan 2020.
>
>
>
> Please note the following:
>
> 1. No Battery Balancing
>
>
>
> 2. Command Load Constraint Violation Report (CCVR)
>
>
>
> The 2 IBX-CLC-006 constraint violations are acceptable. This is because 2 contacts have been scheduled within in a 5 hour period.
>
> IBEX,AUWA01,ADD,01/23/20,023,19:00:00,01/23/20,023,20:00:00,,LAHO 160K Orbit# 474 SSR_Dump/Tracking Contact 13.5re Asc
>
> IBEX,USAK01,ADD,01/23/20,023,23:30:00,01/24/20,024,00:30:00,LAHO 160K IBEX-3 Orbit# 475 Lo Normal Sweep 16re ASC
>
>
>
> IBEX_2020_023_o0475a_v001_.ccvr
>
>
>
> ==========================
>
> HARD CONSTRAINT VIOLATIONS
>
> ==========================
>
> NO VIOLATIONS.
>
>
>
> ==========================
>
> SOFT CONSTRAINT VIOLATIONS
>
> ==========================
>
> IBX-CLC-006: Planned transmission at 2020/01/23 20:00:00 UTC - 2020/01/23
>
> 23:28:00 UTC exceeds the maximum contiguous transmission time of
>
> 5400 seconds
>
> IBX-CLC-006: Planned transmission at 2020/01/23 23:28:00 UTC - 2020/01/24
>
> 00:32:00 UTC is preceded by one or more additional transmissions
>
> which, when combined, exceed the maximum transmission time of 5400
>
> seconds within a 18000-second window (total planned transmission
>
> time this window is 16320.000 seconds)
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/01/23 20:01:23 UTC
>
> IBX-CLC-016: No command to enable spin pulse protection was found after
>
> transition to science mode at 2020/01/27 09:45:36 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]
>
>
>
>
>
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