[Isocops] IBEX Orbit# 284 ATS (22 Apr 15 - 1 May 15) - v001 approval
Ken Fairchild
fair-play at comcast.net
Fri Apr 10 09:20:18 EDT 2015
All,
Note: Angle at orbit 285 apogee after the perigee sun precession maneuver: 4.814 deg
I have looked at the orbit 284 ATS,
IBEX_2015_112_o0284a_v001.scr,
and I approve.
There are no constraint violations in
IBEX_2015_112_o0284a_v001.ccvr.
The PL commands in the v001 ATS match those in the v002 STF,
IBEX_2015_112_o0284a_v002.stf,
except that 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_2015_112_o0284a_v001.oef,
and as verified with ibex_orbit.
There are two star tracker outages. The first starts about 15 hours before 15 Re descending and ends 9- hours before perigee. The second starts about 4 1/2 hours after the first outage ends and ends 12- hours later. Some despinning may be required due to the first outage.
There is one moon in Lo FOV session in arc A. The ATS start time is about 9 1/2 hours after that in the OEF. The end commands for this session do not appear in the ATS because the end time occurs after we've descended. The OEF has a second session in arc B but this session does not appear in the ATS because it is too short.
The ground station command sequences are correct and the timing and bit rates match those in the contacts file,
IBEX_Orbit284Contacts.txt,
for all contacts (4).
No battery cell balancing this orbit; we'll do it again in the next orbit.
The inertial maneuver at perigee of orbit 283 left us pointing in safe directions for the orbit 284 arc A ascending and descending sequences:
ibex_rotate -o -u 0.869015,0.457792,0.187724 -w ibex-sun -t 2015/04:23:01:41:05
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.869015,+0.457792,+0.187724
which is R.A. +27.780 Decl. +10.820
missing R.A. +30.203 Decl. +12.294 (ibex-sun)
error is R.A. +2.423 Decl. +1.474
for a total 2.794 deg
ibex_rotate -o -u 0.869015,0.457792,0.187724 -w ibex-sun -t 2015/04:26:14:53:24
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.869015,+0.457792,+0.187724
which is R.A. +27.780 Decl. +10.820
missing R.A. +33.660 Decl. +13.474 (ibex-sun)
error is R.A. +5.880 Decl. +2.654
for a total 6.331 deg
The inertial 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 0.828461,0.517801,0.213388 -w ibex-sun -t 2015/04:26:16:36:32
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.828461,+0.517801,+0.213388
which is R.A. +32.006 Decl. +12.321
missing R.A. +33.728 Decl. +13.498 (ibex-sun)
error is R.A. +1.722 Decl. +1.177
for a total 2.050 deg
ibex_rotate -o -u 0.828461,0.517801,0.213388 -w ibex-sun -t 2015/04:26:18:11:38
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.828461,+0.517801,+0.213388
which is R.A. +32.006 Decl. +12.321
missing R.A. +33.790 Decl. +13.519 (ibex-sun)
error is R.A. +1.784 Decl. +1.198
for a total 2.112 deg
ibex_rotate -o -u 0.828461,0.517801,0.213388 -w ibex-sun -t 2015/05:01:03:24:51
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.828461,+0.517801,+0.213388
which is R.A. +32.006 Decl. +12.321
missing R.A. +37.828 Decl. +14.901 (ibex-sun)
error is R.A. +5.822 Decl. +2.580
for a total 6.218 deg
The sun precession maneuver at perigee leaves us pointing in safe directions at the time of the maneuver and at orbit 285 apogee:
ibex_rotate -o -r +37.916 -d +14.930 -w ibex-sun -t 2015/05:01:05:47:31
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.762280,+0.593761,+0.257639
which is R.A. +37.916 Decl. +14.930
missing R.A. +37.916 Decl. +14.930 (ibex-sun)
error is R.A. +0.000 Decl. +0.000
for a total 0.000 deg
ibex_rotate -o -r +37.916 -d +14.930 -w ibex-sun -t 2015-05-06T02:05:41.342Z
Quaternion +0.000000,+0.000000,+0.000000,+0.000000
points axis +1.000000,+0.000000,+0.000000
towards ECI +0.762280,+0.593761,+0.257639
which is R.A. +37.916 Decl. +14.930
missing R.A. +42.694 Decl. +16.348 (ibex-sun)
error is R.A. +4.778 Decl. +1.418
for a total 4.814 deg
No Lo O-mode.
There is no overlap with orbit 283 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: "Ibex Mission Operations" <ibexops at gmail.com>
To: "David Heirtzler" <dheirtzl at atlas.sr.unh.edu>, "IBEX FDG" <ibex at applieddefense.com>, "ISOC at New Hampshire" <isocops at lists.sr.unh.edu>, "Ken Fairchild" <fair-play at comcast.net>, "Marty Quinn" <marty.quinn at unh.edu>, "Michelle Reno" <mreno at swri.edu>, "Nigel Angold" <ngangold at earthlink.net>, "Paul Janzen" <paul.janzen at umontana.edu>, "Robert Lockwood" <robert.lockwood at orbitalatk.com>, "Ryan Tyler" <ryan.tyler at orbitalatk.com>, "Sheral Wesley" <sheral.wesley at orbitalatk.com>, "Tim Perry" <tim.perry at orbitalatk.com>
Sent: Thursday, April 9, 2015 12:50:06 PM
Subject: IBEX Orbit# 284 ATS (22 Apr 15 - 1 May 15)
Guys,
Here are the planning files and ATS for Orbit# 284
Please respond to this email with comments and approvals.
Approvals are required before 13 Apr 15 @ 0700 UTC
Please note the following:
1. No battery balancing this orbit
2. Moon in LO FOV
2015-04-25T05:49:21.510Z,MoonInLoFovStart,orbit:284
2015-04-26T12:34:45.800Z,MoonInLoFovStop,orbit:284
2015-04-26T16:33:35.874Z,MoonInLoFovStart,orbit:284
2015-04-26T21:19:13.399Z,MoonInLoFovStop,orbit:284
# Commenting moon end as next cmd is not descending or moon short session. Original cmd would have been: # Moon (far at 104.0) in FOV session[0] ends:
3. APL-18 SSR_Dump/Tracking Contact
--
Sheral R. Wesley
SPVR., Satellite Operations
IBEX Mission OPS
CYGNUS Mission Planning
(304) 279-6678
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