0Assigned ID: 915
----- Attempting Submission 1 (Fri Apr 11 22:00:59 GMT 2014) -----Sensitive exposures should have an ETC run number provided.
Sensitive exposures should have an ETC run number provided.
A target acquisition should probably be performed before doing
spectroscopy or coronography with STIS or COS.
Sensitive exposures should have an ETC run number provided.
A target acquisition should probably be performed before doing
spectroscopy or coronography with STIS or COS.
Sensitive exposures should have an ETC run number provided.
Sensitive exposures should have an ETC run number provided.
Sensitive exposures should have an ETC run number provided.Exposure times based on prior observations. No acquisition required for
extended target and lax pointing requirements.
This version updated after telecon 19 Sept 2014 with other HST users.-1942770153----- Attempting Submission 1 (Wed Jul 16 13:58:03 GMT 2014) -----
----- Attempting Submission 2 (Thu Sep 18 21:54:44 GMT 2014) -----Exposure times based on prior observations. No acquisition required for
extended target and lax pointing requirements.HST Observations of Comet-Induced Aurora on Mars during the Siding Spring EncounterThe martian upper atmosphere is likely to be strongly perturbed by the near collision with Comet C/2013 A1 (Siding Spring) on 19 Oct. 2014. This is a unique event in the history of space science, it will be the first time that we have a chance to study the close encounter of an active comet with a terrestrial planet. Significant mass and energy will be deposited in the upper atmosphere of Mars if the comet coma is sufficiently dense. Present estimates have Comet Siding Spring at a moderate production rate when it passes by Mars, which is expected to result in the strong perturbations of the martian atmosphere. This proposal is to make HST observations of the atmosphere of Mars before and during the comet encounter to measure the energy input to the upper atmosphere through the auroral emissions that will be produced by the deposition of energy of incoming water-group molecules. The observation of auroral emissions will permit a direct estimate of the total energy input to the martian upper atmosphere, and it will provide us a unique chance to determine the response of the martian atmosphere to strong auroral processes. This will likely be the only opportunity to make this measurement in the lifetime of HST, and it will provide support for the NASA MAVEN mission, which will have recently arrived in orbit about Mars.The proposed HST observations will consist of far-UV images to be obtained with the ACS/SBC, and far and near UV spectra to be obtained with the STIS/MAMA and STIS/CCD modes. The images will provide high resolution maps of the auroral emissions and corresponding energy input, and the highest sensitivity will be obtained in the dark nightside atmosphere. The spectra will be obtained with a long narrow aperture (52 x 0.5) in both far-UV and near-UV wavelengths ranges to cover all the emissions indicated in the SPICAM data. For the spectra the aperture will be placed E/W across the disc of Mars, which will be ~ 10 arc sec in diameter on 19 Oct. 2014, and thus cover both day and nightside atmospheres with the field of view extending to high altitudes above the martian limb. If the martian exosphere expands on a short time scale in response to the comet energy input, we be able to measure this in individual species. We request one visit of 2 orbits (one for ACS, one for STIS) about a week before the encounter to establish the "normal" emissions close in time to the impact, and another visit of two orbits scheduled at the time of the encounter:
12 x 100 sec ACS/SBC FUV images, with F115 and F125 filters
a 1000 sec STIS G140L long slit spectrum, aperture E/W across the disc of Mars
two 500 sec STIS/CCD near-UV long slit spectra, aperture E/W across the disc
One key element of this program is that it must be scheduled as close as possible to the 1-2 hour time of the passage of the comet coma past Mars. If the closest HST visibility window is during an SAA passage, it will not be possible to conduct the far-UV observations with the MAMA's, and we would just schedule the STIS/CCD near-UV spectra.SOLAR SYSTEMDefaultfalsefalsefalsefalsefalseSUPPORTEDSOLAR SYSTEMOffset Mars disc to corner of ACS/SBC field of view to image extended H Lyman alpha coronal emissionPLANETPlanet MarsSTD=MARSTYPE=POS_ANGLE,RAD=13,ANG=320,REF=NORTHUV emission line fluxes are given in the text.EARTHSOLAR SYSTEMPLANETPlanet MarsSTD=MARSEARTHACS/SBCImagingNoNoF115LPACS/SBCImagingNoNoF125LPSTIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/CCDSpectroscopicNoNoG230LB2375Using ephemeris for target 13795-01-MARS-STISephemeris data for target 13795-01-MARS-STIS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 14.243 to 16.245Using ephemeris for target 13795-01-MARS-ACSephemeris data for target 13795-01-MARS-ACS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 14.243 to 16.245The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13795
:visit-id "01"
:proposal-version -1
:trans-version "20140605"
:date "18-Sep-2014 15:42:17.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "28"
:si-bright-earth-limb-angle 20.0
:data-volume 351760
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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:obset-id "01"
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(Tic-Orbit
:proposal-id 13795
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 2738
:al-overhead-at-end 0
:internal-dur-at-end 360
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)false10(Tic-Visit
:proposal-id 13795
:visit-id "02"
:proposal-version -1
:trans-version "20140605"
:date "18-Sep-2014 15:42:20.0"
: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 322272
:tdrss-contact-duration 0
:coron NIL
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(Tic-Obset
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:visit-id "02"
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(Tic-Orbit
:proposal-id 13795
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:orbit-number 1
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)true10Using ephemeris for target 13795-02-MARS-STISephemeris data for target 13795-02-MARS-STIS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 14.243 to 16.245Using ephemeris for target 13795-02-MARS-ACSephemeris data for target 13795-02-MARS-ACS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 14.243 to 16.245The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13795
:visit-id "03"
:proposal-version -1
:trans-version "20140605"
:date "18-Sep-2014 15:42:22.0"
: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 322272
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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:visit-id "03"
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(Tic-Orbit
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:pcs-time 333
:si-vis-utilization 2627
:al-overhead-at-end 0
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)false10Using ephemeris for target 13795-04-MARS-ACSephemeris data for target 13795-04-MARS-ACS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.213 to 16.090. ephemeris interval: 14.243 to 16.245The scheduling data was generated by CASM 22.2.CASM was run in Phase II mode./solaris/user1/aroman/work/OP-cache/13795-v04.xml(Tic-Visit
:proposal-id 13795
:visit-id "04"
:proposal-version -1
:trans-version "20140605"
:date "23-Sep-2014 00:29:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "28"
:si-bright-earth-limb-angle 20.0
:data-volume 333248
:tdrss-contact-duration 0
:coron NIL
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(Tic-Obset
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(Tic-Orbit
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:dark-offset NIL
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:max-dark-utilization 1920
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