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Program!Coordinator!Document!
Armstrong!!!
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The!safe!target!offset!procedure!is!used!whenever!a!PI!proposes!to!observe!
targets!subject!to!infrequent!or!unpredictable!outbursts!that!would!exceed!the!
countrate!limits!of!an!HST!instrument,!should!they!occur!during!observation.!!The!
Contact!Scientist!(CS)!for!the!program!should!know!whether!or!not!to!initiate!this!
process!based!on!the!ETC!calculations!submitted!by!the!PI!for!the!target!being!
observed.!!Once!the!CS!opts!for!the!safe!target!offset!procedure!they!must!first!notify!
the!Program!Coordinator!(PC)!who!implements!the!procedure!detailed!in!this!
document!and!formally!resubmits!the!proposal!when!all!the!information!has!been!
entered!and!double!checked.!!The!resubmission!will!include!two!additional!visits!as!
well!as!entering!special!requirements!on!the!science!visit!involved,!and!the!addition!
of!a!safe!offset!target.!!For!the!additional!visits,!one!will!be!used!to!allocate!and!set!
up!the!safe!position!offset!slot!for!the!science!visit!and!is!to!execute!about!3!days!
before!the!science!visit.!!!The!other!is!used!only!for!BOP!checking!the!safe!target!and!
should!not!execute!onboard!HST.!!This!unexecuted!BOP!visit!is!required!because!the!
APT/BOT!will!not!process!visits!with!the!special!commanding!required!to!set!up!this!
procedure.!!A!final!CS!review!is!needed!upon!the!PCs!resubmission,!and!it!is!
recommended!the!CS!comment!on!the!offset!direction!and!magnitude!as!well!as!any!
orient!constraints.!!!
Once!the!CS!submits!a!review!on!the!required!visits,!the!PC!can!set!the!
science!and!S/C!visit!to!“Flight!Ready”!after!Commanding!has!approved!the!S/C!visit.!!
The!BOP,!however!needs!to!have!it’s!visit!status!set!to!“withdrawn”!and!“notQ lrp_candidate.”!!
During!the!week!of!observation,!it!is!highly!recommended!that!the!GO/PI!
maintains!observation!support!for!his!or!her!target.!!Within!24!hours!of!the!
observation!window,!the!GO!is!required!to!submit!the!target’s!magnitude!to!the!CS.!!
Once!the!CS!has!confirmed!that!the!target!is!not!in!outburst!they!give!the!approval!to!
commanding!for!target!execution.!
This!procedure!exists!for!the!health!and!safety!of!HST.!!It!enables!GOs!to!
observe!targets!in!quiescence!that!could!go!into!outburst!with!relatively!low!risk!to!
the!HST.!!Having!this!option!is!advantageous!to!science,!and!it!is!extremely!
important!that!all!parties!involved!do!their!job!accurately!and!thoroughly!for!this!
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procedure!to!be!truly!successful.!!!
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Prep:!determine!intended!day!of!execution!before!beginning!
a.) !ssh!into!a!SOGS!Solaris!machine!(e.g.,!bugs) $ and!execute!the!following!!
command: $
>!
nom_pos$yyyy.ddd$–align$=$ppppp:oo:aa:vv$
!!!!!where!yyyy!=!year!the!visit!is!to!be!executed!

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Program!Coordinator!Document!
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!!!!!!ddd!=!day!of!the!year!the!visit!is!to!be!executed!!
!!!!!!!!!!!!!!ppppp!=!proposal!number!
!!!!!!!!!!!!!!!!!!!!!!oo!=!obset!id!!
$
!!!!!!!!!aa!=!alignment!id!(usually!01)!
!!!!!!!!!vv!=!version!(usually!01)!
b.) !from!nom_pos!data!collect!
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V2V3!X!COORDINATE!
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V2V3!Y!COORDINATE!
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V3PA!@TGT!!!
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Figure$1.$$ !Data!returned!from!nom_pos!command!for!date!2013.151,!for!alignment!12870:07:01:01.!

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Program!Coordinator!Document!
Armstrong!!!
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Figure$2 .!!APT!interface!(left)!with!Aladin!interface!overlaid!(right)!
$ c.) !Open!APT!and!retrieve!corresponding!proposal.!!Highlight!the!relevant!
science!visit.!!
1) !Click!on!“view!in!Aladin.”!Wait!for!Aladin!window!to!pop!up,!and!
then!back!in!the!APT!window,!click!on!“GS!check”!and!wait!for!Aladin!
window!to!load!all!the!processes!in!the!“GS!check”!menu!(60’’x60’’!
DSS!image,!GSC2!catalogue!out!to!60’’,!GS!filters!which!result!in!a!
potential!GS!candidate!having!a!green!square!label!it).!
2) !In!Aladin!window,!rotate!FOV!orient!to!U3PA@TGT!(calculated!by!
subtracting!180!degrees!from!the!V3PA@TGT!found!in!the!nom_pos!
command)!by!placing!cursor!over!the!edge!of!an!FGS!region!until!the!
arrow!becomes!a!rotating!circle.!Carefully!keep!the!placement!of!the!
cursor!over!this!region!and!hold!the!mouse!down!while!rotating!the!
field!of!view!to!the!desired!U3!indicated!at!the!bottom!of!the!Aladin!
window.
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3) !Back!in!APT!window,!click!on!the!gold!star!titled!“BOT”!at!the!top!of!
the!APT!menu!bar.!!In!red,!click!on!“Update!GSC2!Display,”!and!then!
click!on!“Update!GALEX!Display”!without!Proper!Motion!turned!on.!
4) !In!Aladin!window,!zoom!in!to!aperture.!
5) !In!APT!window!under!the!VIEW!IN!ALADIN!menu!click!on!“orient!
ranges.”!!
6)$ Make!~!
9.8’’ !offset!and!note!direction!
(West$=$negative;$South$=$ negative) !
i) In!order!to!make!this!offset,!click!the!3rd!tool!from!the!top!of!
the!menu!on!the!Aladin!screen!labeled!“dist”.!!Click!and!drag!
from!the!center!of!the!aperture,!traveling!outwards!as!close!to!
9!arcsec!as!possible.!!!
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ii) The!offset!should!be!in!a!direction!away!from!other!sources.!
iii) !The!offset!direction!needs!to!be!chosen!so!that!the!nominal!
U3!is!not!excluded!in!the!orient!range!when!avoiding!the!
science!target.!!This!will!have!to!be!combined!with!any!
direction!requested!by!an!instrument!team!in!regards!to!a!
possible!PEAKD!direction.!
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Figure$3.$ !Aladin!image!showing!target!in!primary!aperture!(BOA!blue).!!Secondary!
aperture!(PSA)!is!shown!in!pink.!!The!gold!vector!shows!the!offset!position!from!the!
!!!!!!!!!!!target!(9.82!arcseconds).!!The!tan!areas!are!the!overlapping!annuli!used!for!bright!object!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!checks!on!the!two!apertures..!
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d.) !From!bottom!of!Aladin!screen!collect:!
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1)
2)
3)
4)
!Total!Distance!(arcsec)!
!Distance!in!RA!!(seconds)!
!Distance!in!DEC!(arcsec)
!PA!(degrees!in!U3)!
(West$=$negative;)
$(South$=$negative) !
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Program!Coordinator!Document!
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An!offset!of!9.0Q9.9!arcseconds!is!the!current!acceptable!offset!range!due!to!timing!
restrictions!for!the!telescope!to!slew!within!the!allotted!overhead!time.!!We!
currently!allow!enough!time!for!the!telescope!to!slew!a!maximum!of!10.0!
arcseconds.!!This!equates!to!approximately!27!seconds.!!However,!time!may!be!
compromised!due!to!factors!such!as!nominal!roll!of!the!telescope,!buffer!dumps,!
overhead!time!all!ready!used,!!etc.!!Therefore,!permission!for!an!offset!of!greater!
than!9.8!arcseconds!must!be!granted!by!OED.!!If!a!slew!exceeds!the!allotted!time!for!
whatever!reason,!the!maneuver!will!occur!using!science!exposure!time.!
1.) Confirm!target!being!used!in!the!science!visit.!
2.) Make!a!duplicate!of!that!science!target.!
3.) Rename!the!duplicate!target!TARGET##QSAFEQTARGET!and!renumber!if!
necessary.!
a) CategoryQ!Unidentified!
b) Description:!check!blank!field!
c) Pos!Type!=!Offset!
d) From!Target:!science!target!
e) Offset!RA!=!RA!from!Aladin!(west!is!negative,!east!is!positive)!
f) Offset!DEC!=!DEC!from!Aladin!(north!is!positive,!south!is!negative)!
g) Leave!uncertainties,!Leave!Vmags!
h) Delete!“other!fluxes”!
4.) !Enter!comments,!such!as!“This!target!is!a!blank!piece!of!sky!which!is!the!
bright!object!safe!pointing!and!is!9.031!arcseconds!away!at!a!PA!49.2!degrees!
from!GWQLIB.”!
5.) !SAVE!
1.) Create!new!visit![number,!label,!comment]!!Suggested!comment:!!This!visit!
allocates!and!sets!up!the!safe!position!offset!slot!for!<science!visit>!which!
will!use!that!slot.!!This!S/C!visit!should!go!earlier!in!the!week!while!<science!
visit>!will!be!at!least!3!days!later.!The!S/C!visit!will!contain!only!1!exposure.!!
Note:!weekends!are!to!be!avoided!since!the!CS!must!clear!the!target!within!
24!hours!of!HST!execution.!
2.) At!the!exposure!level:!!
a) config:!S/C!
b) Target:!science!target!
c) !mode:!DATA!
d) !Aperture:!V1!
e) exptime:!5!sec!
3.) In!exposure!special!requirements:!!!
a) Enter!POSTARG!requirement!using!the!X!COORD!!and!Y!COORD!from!
the!nom_pos!command!as!the!(x,y)!values!for!the!POSTARG.!
b) SAVE!OFFSET:!V##SAF!!(ignore!warning)!where!##!=!visit!number!
c) Check!Special!Commanding!and!type!in!“ ECSLOTSET” !to!field!

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d) Enter!QESIPARMS:!!
i.
ANGLE!from!Aladin!(PA)!(same!PA!as!section!I.d.4.)!
ii.
DIST!from!Aladin!(arcsec)!
4.) SAVE!
1.) Duplicate!the!science!visit.!!This!will!become!the!BOP!visit.!
2.) Add!changes!to!science!visit:!
a) !comments!(e.g.,!“This!should!be!scheduled!in!eveningQlocal!time.!!
Flags!need!to!be!cleared!during!the!work!day.”)!
b) Add!exposure!level!special!requirement!to!each!exposure!in!the!
science!visit,!USE!OFFSET!V##SAF!(same!label!as!in!SAVEOFFSET!in!
the!S/C!visit).!!!
3.) !In!the!BOP!visit!change!
a) Visit!Number!
b) Visit!Label:!!SCIENCETARGETQBOPQONLY!
c) Comment!!(eg.,!!“This!visit!is!for!BOP!checking!the!safe!target!only!and!
should!not!execute!onboard!HST.”)!
4.) At!the!exposure!level,!change!all!targets!to!the!offset!target.!
5.) SAVE!
Orient!ranges!are!necessary!to!add!because!the!9.0!–!9.8!arcsecond!offset!will!still!
include!the!science!target!in!the!inactive!macroaperture.!
1.) Click!on!the!BOP!visit!and!“View!in!Aladin”!
2.) When!Aladin!window!appears,!load!the!BOT!tool!as!before!and!note!
that!the!coverage!range!should!have!an!arrow!pointing!north.!
3.) Double!check!that!the!safe!target!is!actually!where!you!intended.!
4.) Zoom!out!and!adjust!the!FOV!to!the!same!U3!you!applied!to!the!science!
visit.!
5.) Zoom!back!in!and!note!that!the!green!arrow!should!now!be!pointing!
towards!U3.!!This!is!the!direction!you!have!to!include!in!the!final!range!
so!as!to!keep!this!visit!schedulable.!
6.) Move!green!arrow!clockwise!and!counterclockwise!noting!the!degrees!
on!the!bottom!of!the!screen.!!Cradle!either!side!of!the!science!target!
and!note!the!degrees.!!Apply!the!min!and!max!degree!to!the!orient!
range!in!the!visit!level!of!the!BOP!in!APT.!!After!doing!so,!you!need!to!
continuously!update!the!BOT!tool!and!apply!the!update!to!both!the!
GSC2!and!GALEX!catalogues!to!see!your!adjustments.!!Repeat!the!
process!until!you’ve!“sliced”!out!the!original!science!target!from!the!
orient!range.!See!Figure!4!for!final!result.!
7.) Apply$Orient$Ranges$to$all$3$linked$visits!
!(Science,!S/C,!BOP)!
8.) SAVE!

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Program!Coordinator!Document!
All!editing!within!APT!is!now!complete.!
Armstrong!!!
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Figure!4.!!The!bright!object!checking!areas!now!do!not!include!the!science!target.!!The!green!arc!shows!!
acceptable!U3!ranges!for!the!visits.!!The!red!arc!shows!the!restricted!U3!ranges.!(The!large!gray!dot!is!the!!
original!COS!lifetime!position!and!will!not!be!displayed!beyond!Aladin!21.2.)!
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PROGRAM$COORDINATOR$ADDITIONAL$NOTES:$
1.) Double!check:!!make!sure!all!3!linked!visits!have!comments!and!no!red!X!
errors.!
2.) During!CheckQin!be!sure!that!EVERYTHING!goes!in!history!file.!
3.) Only!run!OpsToolSet!on!NEW/updated!entities!to!save!time.!
4.) In!Visit!Status,!move!S/C!visit!to!ready!and!move!BOP!to!“not_lrp_candidate”.!!
This!will!keep!the!visit!from!losing!plan!windows!overnight.!
5.) Also!in!Visit!Status,!be!sure!to!put!in!the!scheduling!comments!for!all!3!linked!
visits.!
6.) Check!that!the!plan!window!has!not!changed!in!Spike!after!processing.!!
(sometimes!the!restricted!orient!range!will!change!guideQstar!availability)!
7.) The!CS!review!will!only!be!submitted!for!the!safe!and!science!visit.!!Make!
sure!the!CS!approves!your!orient!ranges!!
8.) Special!commanding!in!S/C!visit!must!be!signed!off!prior!to!moving!to!“Flight!
Ready.”!!The!CS!must!send!approval!to!commanding!engineers,!and!at!this!
point!in!time!(2013)!Alan!Welty!and!Ilana!Dashevsky!do!this!for!this!
procedure.!!!

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9.) After!BOP!visit!CS!review!is!complete,!mark!BOP!visit!as!“withdrawn.”!
10.) Note!that!the!BOP!visit!has!a!MINIMUM!of!3!days!separation!but!no!more!
than!5.!!As!a!Program!Coordinator,!you!may!have!to!coordinate!with!the!LRP!
to!assure!that!these!visits!execute!on!the!same!flight!calendar!so!as!to!avoid!
confusion.!!Also,!inform!the!LRP!Group!as!early!as!possible!that!safeQoffset!
visits!are!in!the!current!cycle’s!LRP.!