This submission changes the settings for the STIS observation from G230LB (with the CCD) to G230L (with MAMA). This was always intended but it has been so long since I submitted a proposal that I got caught by APT. Sorry for the confusion.-348201227Assigned ID: 1012
----- Attempting Submission 1 (Thu Feb 14 03:20:35 GMT 2013) -----
HST Phase I Proposal 1012 (ISON_DD.apt) successfully submitted.
----- Attempting Submission 2 (Thu Feb 14 22:00:41 GMT 2013) -----Initial submission of DD C/ISON spectroscopy proposal821934820----- Attempting Submission 1 (Tue Apr 02 20:52:17 GMT 2013) -----We actually have a total of 5 FP-POS exposures in this orbit, which is more than adequate.Distant Activity of Comet ISONWe propose to obtain spectra of the newly discovered, sun-grazing comet ISON (C/2012 S1) well before it reaches the heliocentric distance at which water-sublimation would dominate the activity, i.e. r>3 AU. The comet is clearly active beyond 5 AU and understanding which volatiles are driving the activity is a key question that must be answered before the physical processes change with the onset of rapid water sublimation.We request 4 orbits using COS/G160M to provide a sensitive search for CO (via the 4PG emissions). If Q is ~10^28, the CO emission can be detected in a single orbit. Observing in 4 different orbits will allow us to determine the temporal variability in the comet's activity if it is roughly 10^28 s^-1. Otherwise we plan to co-add the data from all four orbits to place even stricter constraints, at the level of several 10^27 s-1, on the CO production rate. COS/NUV ACQ/SEARCH and ACQ/IMAGE will be used in each COS orbit to accurately place the nucleus in the aperture (PSA), a technique that worked beautifully during our previous comet observations.
We also request 1 orbit using STIS/G230L with the 2'' slit to search for OH emission, from which we can determine the H2O production rate. Using a vectorial model for the OH spatial distribution (Festou, A&A, v95, p69, 1981) and the sensitivity of STIS/G230L based on our previous cometary observations, we estimate the OH emission could be detected with S/N ~ 5 in a single orbit if QH2O ~ 10^29. Although such a high H2O production rate from the nucleus is not expected, a cloud of icy grains might surround C/ISON, and the sublimation of those grains could dramatically raise the amount of H2O in the coma. Our observations with STIS/G230L could test this hypothesis. The STIS/G230L observations will also cover emissions from CS, S2, and the forbidden Cameron bands of CO (from which the CO2 production rate can be derived; see Weaver et al., ApJ, v422, p374, 1994), although the chances of detecting these emissions are slim. STIS/CCD ACQ will be used in each STIS orbit to accurately center the nucleus in the slit, and this has worked well during previous comet observations. We also plan to take one STIS/CCD F28x50LP full-frame image at the back end of the STIS/G230L orbit to provide context for our spectroscopic program (e.g., to provide information on jets and other coma asymmetries).
Given its large heliocentric and geocentric distances, the comet's apparent motion is relatively slow (~18"/hr) and is easily within HST's tracking capabilities.
We have requested that the STIS orbit be the middle of the five orbits, all of which are optimized if they are sequential. This placement maximizes the chance of seeing variability in the CO outgassing if it is significant and provides our context image at the midpoint of the observationsEphemeris updates will be requiredSOLAR SYSTEMDefaultfalsefalsefalsefalsefalseSUPPORTEDSOLAR SYSTEMV-mags are for the nucleus.
Ephemeris offsets will be uplinked, if necessary, to correct
for any errors in the JPL #20 solution.COMETComet ISON (C/2012 S1)TYPE=COMET,Q=0.01250228833615271,E=1.000004178571949,I=61.86120174134099,O=295.7371915514632,W=345.5093083227027,T=28-NOV-2013:18:42:10,TTimeScale=TDT,EQUINOX=J2000,EPOCH=08-JAN-2013,EpochTimeScale=TDTEARTHCOS/FUVSpectroscopicNoNoG160M1600STIS/NUV-MAMASpectroscopicNoNoG230L2376/private/var/folders/tb/q3zsbl1j6d3gvdw7h3dn3qmj9fwgz5/T/OPVisit4796655810415191533.xmlUsing ephemeris for target 13197-01-ISONephemeris data for target 13197-01-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.092. ephemeris interval: 13.091 to 13.130Timing link suitability includes constraints ([Sequence (01 02 03 04 05) within 0.4 days])The scheduling data was generated by CASM 21.0.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13197
:visit-id "01"
:proposal-version -1
:trans-version "20121031"
:date "02-Apr-2013 16:35:28.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 34960
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13197
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13197
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 366
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10Requires ephemeris updateRequires ephemeris updateRequires ephemeris correction ISONRequires ephemeris correction ISON/private/var/folders/tb/q3zsbl1j6d3gvdw7h3dn3qmj9fwgz5/T/OPVisit8714126483436067370.xmlUsing ephemeris for target 13197-02-ISONephemeris data for target 13197-02-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.092. ephemeris interval: 13.091 to 13.130Timing link suitability includes constraints ([Sequence (01 02 03 04 05) within 0.4 days])The scheduling data was generated by CASM 21.0.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13197
:visit-id "02"
:proposal-version -1
:trans-version "20121031"
:date "02-Apr-2013 16:35:51.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 34960
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13197
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13197
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 366
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10Requires ephemeris correctionRequires ephemeris correctionRequires ephemeris correction/private/var/folders/tb/q3zsbl1j6d3gvdw7h3dn3qmj9fwgz5/T/OPVisit3843768910638959433.xmlUsing ephemeris for target 13197-03-ISONephemeris data for target 13197-03-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.092. ephemeris interval: 13.091 to 13.130Timing link suitability includes constraints ([Sequence (01 02 03 04 05) within 0.4 days])The scheduling data was generated by CASM 21.0.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13197
:visit-id "03"
:proposal-version -1
:trans-version "20121031"
:date "02-Apr-2013 16:40:46.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 124208
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13197
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13197
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2683
:al-overhead-at-end 0
:internal-dur-at-end 434
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10requires ephemeris correctionrequires ephemeris correctionreequires ephemeris correction/private/var/folders/tb/q3zsbl1j6d3gvdw7h3dn3qmj9fwgz5/T/OPVisit7598878570275266172.xmlUsing ephemeris for target 13197-04-ISONephemeris data for target 13197-04-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.092. ephemeris interval: 13.091 to 13.130Timing link suitability includes constraints ([Sequence (01 02 03 04 05) within 0.4 days])The scheduling data was generated by CASM 21.0.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13197
:visit-id "04"
:proposal-version -1
:trans-version "20121031"
:date "02-Apr-2013 16:42:27.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 34960
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13197
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13197
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 366
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10requires ephemeris correctionrequires ephemeris updaterequires ephemeris update/private/var/folders/tb/q3zsbl1j6d3gvdw7h3dn3qmj9fwgz5/T/OPVisit4440723691797956919.xmlUsing ephemeris for target 13197-05-ISONephemeris data for target 13197-05-ISON does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.092. ephemeris interval: 13.091 to 13.130Timing link suitability includes constraints ([Sequence (01 02 03 04 05) within 0.4 days])The scheduling data was generated by CASM 21.0.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13197
:visit-id "05"
:proposal-version -1
:trans-version "20121031"
:date "02-Apr-2013 16:42:50.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 34960
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13197
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13197
:visit-id "05"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 366
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10requires ephemeris correctionrequires ephemeris correctionrequires ephemeris correction