IBEX_2022_347_o0591a_v001.oef,

and as verified with ibex_orbit.

There is one star tracker outage.  The outage starts 1+ days before apogee and runs for 3+ 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_Orbit591_Contacts.txt,

for all contacts (2).

We are doing battery cell balancing and the balancing commands are correct and offset by enough time from other commands.

The inertial precession maneuver at perigee of orbit 590 leaves us pointing in safe directions for the orbit 591 arc A ascending and descending sequences:

ibex_rotate -o -u -0.128122,-0.905895,-0.403657 -w ibex-sun -t 2022/12:14:07:05:01

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.128122,-0.905895,-0.403657

 which is     R.A. +261.950 Decl. -23.807

 missing      R.A. +261.255 Decl. -23.214 (ibex-sun)

 error is     R.A.   +0.695 Decl.  +0.593

 for a total  0.871 deg

ibex_rotate -o -u -0.128122,-0.905895,-0.403657 -w ibex-sun -t 2022/12:18:06:32:32

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.128122,-0.905895,-0.403657

 which is     R.A. +261.950 Decl. -23.807

 missing      R.A. +265.659 Decl. -23.362 (ibex-sun)

 error is     R.A.   +3.709 Decl.  +0.445

 for a total  3.428 deg

The sun precession maneuver at apogee leaves us pointing in safe directions at the time of the maneuver and for the arc B ascending and descending sequences:

ibex_rotate -o -r +265.741 -d -23.363 -w ibex-sun -t 2022/12:18:08:20:40

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.068176,-0.915476,-0.396555

 which is     R.A. +265.741 Decl. -23.363

 missing      R.A. +265.741 Decl. -23.363 (ibex-sun)

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

 for a total  0.000 deg

ibex_rotate -o -r +265.741 -d -23.363 -w ibex-sun -t 2022/12:18:09:50:46

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.068176,-0.915476,-0.396555

 which is     R.A. +265.741 Decl. -23.363

 missing      R.A. +265.809 Decl. -23.364 (ibex-sun)

 error is     R.A.   +0.068 Decl.  +0.001

 for a total  0.062 deg

ibex_rotate -o -r +265.741 -d -23.363 -w ibex-sun -t 2022/12:22:08:14:27

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  -0.068176,-0.915476,-0.396555

 which is     R.A. +265.741 Decl. -23.363

 missing      R.A. +270.104 Decl. -23.419 (ibex-sun)

 error is     R.A.   +4.363 Decl.  +0.056

 for a total  4.005 deg

The inertial precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 592 apogee:

ibex_rotate -o -u 0.031165,-0.913021,-0.406721 -w ibex-sun -t 2022/12:22:10:48:54

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.031165,-0.913021,-0.406721

 which is     R.A. +271.955 Decl. -23.999

 missing      R.A. +270.227 Decl. -23.423 (ibex-sun)

 error is     R.A.   +1.728 Decl.  +0.576

 for a total  1.684 deg

ibex_rotate -o -u 0.031165,-0.913021,-0.406721 -w ibex-sun -t 2022-12-27T06:22:32.568Z

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

 points axis  +1.000000,+0.000000,+0.000000

 towards ECI  +0.031165,-0.913021,-0.406721

 which is     R.A. +271.955 Decl. -23.999

 missing      R.A. +275.655 Decl. -23.320 (ibex-sun)

 error is     R.A.   +3.700 Decl.  +0.679

 for a total  3.457 deg

Lo Normal mode for the entire orbit.

There is no overlap with orbit 590 commands by manual inspection or by checking at

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

Command Approval Checklist is attached.

Ken