Updated to change to the C20 latex template.
(The C19 template was used for the last submission.)
Also made a minor revision to the abstract.737812599Assigned ID: 54
----- Attempting Submission 1 (Tue Feb 21 00:42:12 GMT 2012) -----
HST Phase I Proposal 54 (HST_MBC_TOO_phase1_apt.apt) successfully submitted.
----- Attempting Submission 2 (Tue Feb 21 19:23:00 GMT 2012) -----All exposures now use the UVIS2 aperture.
Added time back into exposure 6 of visit 1.977094120----- Attempting Submission 1 (Fri Jun 29 21:04:02 GMT 2012) -----
----- Attempting Submission 2 (Thu Jul 05 16:42:03 GMT 2012) -----
----- Attempting Submission 3 (Mon Jun 24 20:38:17 GMT 2013) -----
HST Phase II Proposal 13005 (13005_elst-pizarro.apt) successfully submitted.
----- Attempting Submission 4 (Tue Jun 25 12:54:11 GMT 2013) -----
HST Phase II Proposal 13005 (13005_elst-pizarro_v2.apt) successfully submitted.
----- Attempting Submission 5 (Tue Jun 25 14:39:30 GMT 2013) -----
----- Attempting Submission 6 (Tue Jun 25 17:35:25 GMT 2013) -----Hubble Imaging of a Newly Discovered Main Belt CometMain-belt comets (MBCs, or 'active asteroids') have the orbital characteristics of asteroids but also show transient, comet-like activity. Examples of mass-loss likely caused by ice sublimation and by impact have been established, while numerous additional processes are capable of launching material from asteroids. We propose two orbits of non-disruptive, target-of-opportunity observations of the next MBC discovered in order to help determine the process driving mass-loss.The Main Belt Comet 133P/Elst-Pizarro has recently (mid-June 2013) erupted in activity, displaying
a long, thin dust tail. Hubble observations in July or early August 2013 should help determine
why this object has become active again.
We plan to take WFC3/UVIS observations with the F350LP filter in two consecutive orbits
to make sensitive measurements of the near-nucleus coma. Each orbit will have identical
activities: images at one CCD location for the first half of the orbit and images at a dithered
CCD location for the second half of the orbit.The trigger for these observations is the discovery of an object in the main-belt having a Tisserand parameter TJ > 3.1 and showing a coma or tail. Comets have TJ < 3, asteroids have TJ > 3. The parameter is useful only in the context of the circular, restricted three-body approximation. As a result, objects with TJ very close to 3 can be either cometary or asteroidal in nature. In practice, we take TJ > 3.1 as the dividing line, since objects with larger TJ cannot be dynamically linked to the classical comets. The Tisserand constraint is quite stringent, and avoids any possibility of confusion with classical comets. 133P/Elst-Pizarro is the prototypical MBC and its recent activation is the trigger for this cycle 20 program.SOLAR SYSTEM12falsefalse0.00.0falsefalsefalseSUPPORTEDSOLAR SYSTEMThe nucleus will be brightest in late-August 2013 (closest approach to Earth) and early September (opposition),
at which time the long exposures used here may saturate in the peak pixel.
However, we prefer observing ASAP, in July or early August, in which case all the exposure times should be fine.COMETMain Belt CometTYPE=COMET,Q=2.649915931081285,E=0.1614201402748764,I=1.386923482939521,O=160.1479051307290,W=132.1299288431555,T=08-FEB-2013:20:06:43,TTimeScale=TDT,EQUINOX=J2000,EPOCH=01-AUG-2013,EpochTimeScale=TDTEARTHWFC3/UVISImagingNoNoF606W/private/var/folders/dv/kllm6qvx1m3bq_0v7lp6wwtc000702/T/OPVisit2530212809797699801.xmlUsing ephemeris for target 13005-01-133P-ELST-PIZARROephemeris data for target 13005-01-133P-ELST-PIZARRO does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.152. ephemeris interval: 13.151 to 15.152Timing link suitability includes constraints ([02 After 01 by 0.1 to 0.1 days])The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13005
:visit-id "01"
:proposal-version -1
:trans-version "20130502"
:date "25-Jun-2013 13:34:47.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1732496
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13005
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13005
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2836
:al-overhead-at-end 0
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10/private/var/folders/dv/kllm6qvx1m3bq_0v7lp6wwtc000702/T/OPVisit8022817701648814285.xmlUsing ephemeris for target 13005-02-133P-ELST-PIZARROephemeris data for target 13005-02-133P-ELST-PIZARRO does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 12.212 to 14.152. ephemeris interval: 13.151 to 15.152Timing link suitability includes constraints ([02 After 01 by 0.1 to 0.1 days])The scheduling data was generated by CASM 21.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 13005
:visit-id "02"
:proposal-version -1
:trans-version "20130502"
:date "25-Jun-2013 13:34:18.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1732496
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13005
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13005
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2836
:al-overhead-at-end 0
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true10