[Isocops] IBEX Orbit# 324 ATS Approval (19 Apr 16 - 28 Apr 16) - v001 approval

Ken Fairchild fair-play at comcast.net
Sat Apr 9 10:30:08 EDT 2016


All, 

Note: Off-pointing at arc B descending is 3.871 deg 
Off-pointing at orbit 325 apogee is 4.919 deg 

I have looked at the orbit 324 recovery ATS, 



IBEX_2016_110_o0324a_Recovery_v001.scr, 




and I approve. 




The constraints in 




IBEX_2016_110_o0324a_Recovery_v001.ccvr 




are odd (like MPS is off the rails) but the ATS looks OK. 




The PL commands in the v001 ATS match those in the v003 STF, 




IBEX_2016_110_o0324a_v003.stf, 




except the ATS has an SSR_DUMP_NEW command. This is expected as APL is being used for the dump pass. 




Ascending and descending command sequences are consistent with each other and 15 Re ascending, the apogee maneuver time and 15 Re descending as determined from the OEF, 




IBEX_2016_110_o0324a_Recovery_v001.oef, 




and as verified with ibex_orbit. 




There are 3 star tracker outages. The first starts about 2 hours before 15 Re ascending and ends about 3 hours later. The second starts 3 1/2+ days after the first outage ends and runs for about 3 days. The third starts about 8 1/2 hours before 15 Re descending and ends 9 1/2 hours later. If the star tracker was working some despinning might be required due to the 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_Orbit324_RecoveryContacts.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 323 left us pointing in safe directions for the orbit 324 arc A ascending and descending sequences: 




ibex_rotate -o -r +27.446 -d +11.316 -w ibex-sun -t 2016/04:20:05:17:17 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.870194,+0.451952,+0.196220 

which is R.A. +27.446 Decl. +11.316 

missing R.A. +28.224 Decl. +11.575 (ibex-sun) 

error is R.A. +0.778 Decl. +0.259 

for a total 0.806 deg 




ibex_rotate -o -r +27.446 -d +11.316 -w ibex-sun -t 2016/04:24:06:45:16 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.870194,+0.451952,+0.196220 

which is R.A. +27.446 Decl. +11.316 

missing R.A. +32.155 Decl. +12.959 (ibex-sun) 

error is R.A. +4.709 Decl. +1.643 

for a total 4.888 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 +32.226 -d +12.984 -w ibex-sun -t 2016/04:24:08:33:24 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.824323,+0.519626,+0.224679 

which is R.A. +32.226 Decl. +12.984 

missing R.A. +32.226 Decl. +12.984 (ibex-sun) 

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

for a total 0.000 deg 




ibex_rotate -o -r +32.226 -d +12.984 -w ibex-sun -t 2016/04:24:10:03:30 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.824323,+0.519626,+0.224679 

which is R.A. +32.226 Decl. +12.984 

missing R.A. +32.285 Decl. +13.005 (ibex-sun) 

error is R.A. +0.059 Decl. +0.021 

for a total 0.061 deg 




ibex_rotate -o -r +32.226 -d +12.984 -w ibex-sun -t 2016/04:28:10:47:10 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.824323,+0.519626,+0.224679 

which is R.A. +32.226 Decl. +12.984 

missing R.A. +35.971 Decl. +14.303 (ibex-sun) 

error is R.A. +3.745 Decl. +1.319 

for a total 3.871 deg 




The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 325 apogee: 




ibex_rotate -o -r +36.066 -d +14.334 -w ibex-sun -t 2016/04:28:13:20:57 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.783175,+0.570389,+0.247574 

which is R.A. +36.066 Decl. +14.334 

missing R.A. +36.066 Decl. +14.334 (ibex-sun) 

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

for a total 0.000 deg 




ibex_rotate -o -r +36.066 -d +14.334 -w ibex-sun -t 2016-05-03T12:09:01.963Z 

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

points axis +1.000000,+0.000000,+0.000000 

towards ECI +0.783175,+0.570389,+0.247574 

which is R.A. +36.066 Decl. +14.334 

missing R.A. +40.923 Decl. +15.820 (ibex-sun) 

error is R.A. +4.857 Decl. +1.486 

for a total 4.919 deg 




No Lo O-mode. 




There is no overlap with orbit 323 commands by manual inspection or by checking at 




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




Command Approval Checklist is attached. 




Ken 



----- Original Message -----

From: "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
To: "David Heirtzler" <dheirtzl at atlas.sr.unh.edu>, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS" <IBEXOPS at gmail.com>, "ISOC" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Lockwood.Robert" <robert.lockwood at orbitalatk.com>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <nigel.angold at nasa.gov>, "Paul Janzen" <paul.janzen at umontana.edu>, "Perry.Tim" <tim.perry at orbitalatk.com>, "Tyler.Ryan" <ryan.tyler at orbitalatk.com>, "Wesley.Sheral" <sheral.wesley at orbitalatk.com> 
Sent: Thursday, April 7, 2016 1:31:49 PM 
Subject: IBEX Orbit# 324 ATS Approval (19 Apr 16 - 28 Apr 16) 



Guys, 

Here are the planning files and ATS for Orbit# 324. 

Please respond to this email thread with your comments and approvals. 

Approvals are required before 9 Apr 16 @ 1400 UTC 



Note the following: 

1. No Ascending SetSpinPulseProtectEnable Enable commands 



2. PERIGEE Battery Balancing Commands 

Orbit# 324 PERIGEE: Battery Balancing Commands 

# 2016-04-28T22:10:18.040Z,Perigee,orbit:324 

SetLongEclipseFlag TRUE $TIME=2016/04:28:23:00:00 

SetLongEclipseFlag FALSE $TIME=2016/04:29:00:30:00 





3. APL-18 SSR_Dump 

IBEX,APL-18,ADD,04/28/16,119,21:30:00,04/28/16,119,22:30:00,,11re-Descending Perigee 2K-320K IBEX Orbit# 324 SSR_Dump/Tracking Contact (11 Desc) 





Sheral R. Wesley 

IBEX Mission OPS 

CRS/CYGNUS Mission Planning 

Bldg. 2 Room 1337 

Office (703) 406-5641 

Cell (202) 236-0802 







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