[Isocops] IBEX ORbit# 238 ATS (27 Feb 14 - 8 Mar 14) - v001 approval

Mon Feb 17 11:53:16 EST 2014

All, 

I have looked at the orbit 238 ATS, 

IBEX_2014_058_o0238a_v001.scr, 

and I approve. 

There are no constraint violations in 

IBEX_2014_058_o0238a_v001.ccvr. 

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

IBEX_2014_058_o0238a_v003.stf, 

except that the ATS has an SSR_DUMP_NEW command. However, this is expected as APL is being used for a 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_2014_058_o0238a_v001.oef, 

and as verified with ibex_orbit. 

The Hi ABAB command sequences and timing look reasonable. 

There are two star tracker outages. The first starts about 7 1/2 hours before apogee and ends at apogee. The second starts about 2 1/2 hours after apogee and runs for 3+ days. Some despinning may be required due to these outages. 

There is one moon in Lo FOV session in arc B. The ATS start time is about 7 hours after that in the OEF and the ATS end time is the same as that in the OEF. The difference in start times is not unusual. There are two additional moon in Lo FOV sessions in the OEF but, due to different keep out angles, these sessions are too short to appear in the STF/ATS. 

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

IBEX_Orbit238Contacts.txt, 

for the apogee and APL contacts. All other contacts will be blind acquisitions while we are doing Hi ABAB operations. 

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

The inertial maneuver at perigee of orbit 237 left us pointing in safe directions for orbit 238 arc A ascending and descending sequences: 

ibex_rotate -o -u 0.922468,-0.350671,-0.1615 -w ibex-sun -t 2014/02:27:17:35:01 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.922468,-0.350671,-0.161500 
which is R.A. +339.186 Decl. -9.294 
missing R.A. +340.494 Decl. -8.243 (ibex-sun) 
error is R.A. +1.308 Decl. +1.051 
for a total 1.666 deg 

ibex_rotate -o -u 0.922468,-0.350671,-0.1615 -w ibex-sun -t 2014/03:03:14:20:18 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.922468,-0.350671,-0.161500 
which is R.A. +339.186 Decl. -9.294 
missing R.A. +344.132 Decl. -6.796 (ibex-sun) 
error is R.A. +4.946 Decl. +2.498 
for a total 5.497 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 +344.201 -d -6.768 -w ibex-sun -t 2014/03:03:16:08:26 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.955517,-0.270366,-0.117849 
which is R.A. +344.201 Decl. -6.768 
missing R.A. +344.201 Decl. -6.768 (ibex-sun) 
error is R.A. +0.000 Decl. +0.000 
for a total 0.000 deg 

ibex_rotate -o -r +344.201 -d -6.768 -w ibex-sun -t 2014/03:03:17:38:32 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.955517,-0.270366,-0.117849 
which is R.A. +344.201 Decl. -6.768 
missing R.A. +344.258 Decl. -6.744 (ibex-sun) 
error is R.A. +0.057 Decl. +0.024 
for a total 0.061 deg 

ibex_rotate -o -r +344.201 -d -6.768 -w ibex-sun -t 2014/03:07:15:50:40 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.955517,-0.270366,-0.117849 
which is R.A. +344.201 Decl. -6.768 
missing R.A. +347.821 Decl. -5.220 (ibex-sun) 
error is R.A. +3.620 Decl. +1.548 
for a total 3.919 deg 

The inertial maneuver at perigee leaves us pointing in safe directions at the time of the maneuver at at orbit 239 apogee: 

ibex_rotate -o -u 0.96534,-0.235325,-0.112874 -w ibex-sun -t 2014/03:07:17:33:39 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.965340,-0.235325,-0.112874 
which is R.A. +346.300 Decl. -6.481 
missing R.A. +347.888 Decl. -5.191 (ibex-sun) 
error is R.A. +1.588 Decl. +1.290 
for a total 2.040 deg 

ibex_rotate -o -u 0.96534,-0.235325,-0.112874 -w ibex-sun -t 2014-03-12T16:56:12.051Z 
Quaternion +0.000000,+0.000000,+0.000000,+0.000000 
points axis +1.000000,+0.000000,+0.000000 
towards ECI +0.965340,-0.235325,-0.112874 
which is R.A. +346.300 Decl. -6.481 
missing R.A. +352.573 Decl. -3.244 (ibex-sun) 
error is R.A. +6.273 Decl. +3.237 
for a total 7.038 deg 

No Lo O-mode. 

There is no overlap with orbit 237 commands by manual inspection or by checking at 

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

Command Approval Checklists are attached. 

Ken 

----- Original Message -----
From: "Ibex Mission Operations" <ibexops at gmail.com> 
To: joe at boulder.swri.edu, "IBEX-FDG" <IBEX.fdg at applieddefense.com>, "IBEXOPS/ORB" <IBEXops at orbital.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "John Cavallo" <cavallo.john at orbital.com>, "Ken Fairchild" <fair-play at comcast.net>, "Mark Tapley" <mtapley at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Robert Lockwood" <Lockwood.Robert at Orbital.com>, "Roland Vanderspek" <roland at space.mit.edu>, "Ryan Tyler" <tyler.ryan at orbital.com>, "Sheral Wesley" <wesley.sheral at orbital.com>, "Thomas Regiec" <regiec.thomas at orbital.com>, "Tim Perry" <perry.tim at orbital.com> 
Sent: Saturday, February 15, 2014 2:20:52 PM 
Subject: IBEX ORbit# 238 ATS (27 Feb 14 - 8 Mar 14) 

Guys, 
Here are the planning files and ATS for ORbit# 238. 
Please respond to this email thread with all comments and approvals. 
Approvals are required before 18 Feb 14 @1200 UTC 

Note the following: 
1. Orbit# 238 Eclipse (No Action Required) 
# 2014-02-27T21:59:37.976Z,EclipseEntry,moderate:false,long:false,orbit:238 
# 2014-02-27T22:31:38.249Z,EclipseExit,moderate:false,long:false,orbit:238 

2. Orbit# 238 Apogee: Moon in Lo FOV Commands 
# 2014-03-07T04:41:15.915Z,MoonInLoFovStart,orbit:238 
# 2014-03-07T14:33:43.262Z,MoonInLoFovStop,orbit:238 

3. Battery Balancing at Perigee 
ECT_SetLongEclipseFlag TRUE $TIME=2014/03:08:03:00:00 
ECT_SetLongEclipseFlag FALSE $TIME=2014/03:08:04:30:00 

4. Orbit# 238 Perigee: APL-18 SSR_Dump/Tracking Contact (2k-320k) 

5. Special Ops/Post-LUT Changes 
Hi negative collimator voltage set to 1400 
Hi ABAB (CEM comparison) 

6. Apogee Sun Maneuver 
RAZOR# 569 is incorporated which premantly seperates the following commands by 1 second 
ACT_SetThrustEnable DISABLE $TIME=2014/03:03:16:08:26 
ECT_SetHTRCmd CATBED_5N_HTR,OFF $TIME=2014/03:03:16:08:27 

-- 

Sheral R. Wesley 
SPVR., Satellite Operations 
IBEX Mission OPS 
CYGNUS Mission Planning 
(304) 279-6678 
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