[Isocops] IBEX Orbit# 402 ATS Approval (29 Mar 18 - 7 Apr 18) - v001 approval

Ken Fairchild fair-play at comcast.net
Wed Mar 21 12:11:52 EDT 2018


All,


Note: Angle at orbit 402 arc B descending after the apogee sun precession maneuver: 3.772 deg


I have looked at the orbit 402 ATS,


IBEX_2018_088_o0402a_v001.scr,


and I approve.


The only constraint violations in


IBEX_2018_088_o0402a_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_088_o0402a_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_088_o0402a_v001.oef,


and as verified with ibex_orbit.


There are two star tracker outages.  The first starts before orbit 401 15 Re descending and ends about 3 hours after 15 Re ascending.  The second starts about 1 day 8 hours before apogee and runs for 3+ days.  Some despinning may be required due to these outages.


There are no moon in Lo FOV sessions.


The ground station command sequences are correct and the timing and bit rates match those in the contacts file,


IBEX_Orbit402_Contacts.txt,


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 sun precession maneuver at perigee of orbit 401 left us pointing in safe directions for the orbit 402 arc A ascending and descending sequences:


ibex_rotate -o -r +7.686 -d +3.341 -w ibex-sun -t 2018/03:30:06:06:55

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.989332,+0.133517,+0.058278

which is R.A. +7.686 Decl. +3.341

missing R.A. +8.496 Decl. +3.641 (ibex-sun)

error is R.A. +0.810 Decl. +0.300

for a total 0.862 deg


ibex_rotate -o -r +7.686 -d +3.341 -w ibex-sun -t 2018/04:03:03:47:11

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.989332,+0.133517,+0.058278

which is R.A. +7.686 Decl. +3.341

missing R.A. +12.154 Decl. +5.200 (ibex-sun)

error is R.A. +4.468 Decl. +1.859

for a total 4.828 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 +12.222 -d +5.230 -w ibex-sun -t 2018/04:03:05:35:19

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.973266,+0.210819,+0.091154

which is R.A. +12.222 Decl. +5.230

missing R.A. +12.222 Decl. +5.230 (ibex-sun)

error is R.A. +0.000 Decl. +0.000

for a total 0.000 deg


ibex_rotate -o -r +12.222 -d +5.230 -w ibex-sun -t 2018/04:03:07:05:25

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.973266,+0.210819,+0.091154

which is R.A. +12.222 Decl. +5.230

missing R.A. +12.279 Decl. +5.254 (ibex-sun)

error is R.A. +0.057 Decl. +0.024

for a total 0.062 deg


ibex_rotate -o -r +12.222 -d +5.230 -w ibex-sun -t 2018/04:07:04:25:10

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.973266,+0.210819,+0.091154

which is R.A. +12.222 Decl. +5.230

missing R.A. +15.707 Decl. +6.720 (ibex-sun)

error is R.A. +3.485 Decl. +1.490

for a total 3.772 deg


The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 403 apogee:


ibex_rotate -o -u 0.964694,0.245198,0.096141 -w ibex-sun -t 2018/04:07:06:52:45

Quaternion+0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.964694,+0.245198,+0.096141

which is R.A. +14.261 Decl. +5.517

missing R.A. +15.796 Decl. +6.753 (ibex-sun)

error is R.A. +1.535 Decl. +1.236

for a total 1.964 deg


ibex_rotate -o -u 0.964694,0.245198,0.096141 -w ibex-sun -t 2018-04-12T03:19:39.042Z

Quaternion +0.000000,+0.000000,+0.000000,+0.000000

points axis +1.000000,+0.000000,+0.000000

towards ECI +0.964694,+0.245198,+0.096141

which is R.A. +14.261 Decl. +5.517

missing R.A.+20.379 Decl. +8.570 (ibex-sun)

error is R.A. +6.118 Decl. +3.053

for a total 6.795 deg


No Lo O-mode.


There is no overlap with orbit 401 commands by manual inspection or by checking at


http://ibex.unh.edu/cgi-bin/ats.cgi.


Command Approval Checklist is attached.


Ken


> On March 18, 2018 at 5:39 PM "Wesley, Sheral" <Sheral.Wesley at OrbitalATK.com> wrote:
> 
> 
>     Guys,
> 
>     Here are the planning products and ATS for Orbit# 402.
> 
>     The OEF started with Orbit# 400 because of the sun maneuver at perigee of Orbit# 401
> 
>     Please respond to this email thread with your comments and approvals.
> 
>     Approvals are required before 19 Mar 18 @2200 UTC
> 
>      
> 
>     Note the following:
> 
>      
> 
>     1.       Apogee Sun Maneuver
> 
>     2018-04-01T20:53:19.634Z,StarTrackerOutageStart,dueTo:moon,orbit:402
> 
>     2018-04-03T05:18:07.098Z,Apogee,
> 
>     2018-04-05T01:29:05.648Z,StarTrackerOutageStop,dueTo:moon,orbit:402
> 
>      
> 
>     2.       Battery Balancing
> 
>     Orbit# 402 PERIGEE Battery Balancing
> 
>     #  2018-04-07T16:03:08.794Z,Perigee,orbit:402
> 
>     SetLongEclipseFlag TRUE $TIME=2018/04:07:16:00:00
> 
>     SetLongEclipseFlag FALSE $TIME=2018/04:07:17:30:00 
> 
>      
> 
>     3.       Command Load Constraint Violation Report
> 
>     IBEX_2018_088_o0402a_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 2018/03/30 04:24:20 UTC
> 
>     IBX-CLC-016: No command to enable spin pulse protection was found after
> 
>                  transition to science mode at 2018/04/03 06:35:25 UTC
> 
>      
> 
>     ==============
> 
>     OTHER MESSAGES
> 
>     ==============
> 
>     NO MESSAGES.
> 
>      
> 
>      
> 
>     Sheral  R. Wesley
> 
>     Sr Systems Engineer
> 
>     IBEX , OCO2 Mission OPS
> 
>     CRS/CYGNUS Mission Planning
> 
>     Bldg. 2   Room 1337
> 
>     Office (703) 406-5641
> 
>     Cell (202) 236-0802
> 
>     [cid:image001.jpg at 01D04F6C.5A1C97F0]
> 
>      
> 
> 
> 
>     ---------------------------------------------
>     Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication.
>      Thank you. 
>     *********************
> 
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