Unique Hubble Investigation of a Newly Discovered Main Belt Comet

DD proposal for follow-up observations for the Main Belt Comet P/2014 S4 (Gibbs). This is a non-disruptive ToO. -1423916322 Assigned ID: 2549 ----- Attempting Submission 1 (Wed Nov 05 02:12:57 GMT 2014) ----- The number of orbits used exceeds the number allocated added Hal and Max as contact Co-Is. -1369445089 ----- Attempting Submission 1 (Wed Nov 12 02:15:38 GMT 2014) ----- ----- Attempting Submission 2 (Mon Jan 19 18:09:38 GMT 2015) ----- ----- Attempting Submission 3 (Tue Jan 20 14:27:53 GMT 2015) ----- We have been granted a 1-orbit HOPR repeat, which is visit 11. Unique Hubble Investigation of a Newly Discovered Main Belt Comet We triggered our Target of Opportunity program (GO-13864: Hubble Imaging of a Newly-Discovered Main-Belt Comet) in October, on the new active asteroid P/2014 S4 (Gibbs). The results are exciting, and are consistent with an asteroid ice-sublimator caught in an early stage of development and showing rapid morphological changes. We request 6 orbits of Hubble DD time (1 orbit every ~3 weeks until the object enters Hubble's solar exclusion zone) to capitalize on this early detection. We will examine the evolution of this body so as to better understand the activity mechanism. P/2014 S4 is particularly interesting because it orbits in a region of the asteroid belt of likely importance for the origin of water on the Earth. We repeat our strategy of obtaining five long F350LP exposures in each epoch (orbit), to maximize S/N and the rejection of artifacts (cosmic rays and star trails). Our visits sample the period leading up to solar avoidance in March 2015. Visit 01 suffered a loss of lock on 1 Dec 2014, so visit 11 is a HOPR repeat of it. Of course we can't recover the intended temporal sampling lost wth visit 01, so at this point it makes sense to schedule visit 11 after solar avoidance in Sep or Oct 2015. SOLAR SYSTEM 0 false false false false false SUPPORTED SOLAR SYSTEM ASTEROID Main Belt Comet TYPE=COMET,Q=2.39143777546228,E=0.2422061817783991 ,I=10.96626376761609,O=106.4940930053456,W=253.5249908690453,T=28-AUG-2014:12:11:14,TTimeScale=TDB,EQUINOX=J2000,EPOCH=19-JUN-2013:00:00:00,EpochTimeScale=TDB EARTH WFC3/UVIS Imaging No No F350LP 1415758368097 1417407655000 72.62471499358861 (Tic-Visit :proposal-id 14040 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "11-Nov-2014 21:12:47.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0 1415758368871 1418628468000 59.66201345772049 (Tic-Visit :proposal-id 14040 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "11-Nov-2014 21:12:48.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0 1415758369516 1420647074000 65.97410065426831 (Tic-Visit :proposal-id 14040 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "11-Nov-2014 21:12:49.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0 1415758370076 1421809156000 69.89896110599659 (Tic-Visit :proposal-id 14040 :visit-id "04" :proposal-version -1 :trans-version "20140605" :date "11-Nov-2014 21:12:49.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0 1415758370729 (Tic-Visit :proposal-id 14040 :visit-id "05" :proposal-version -1 :trans-version "20140605" :date "11-Nov-2014 21:12:50.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0 1415758371340 (Tic-Visit :proposal-id 14040 :visit-id "06" :proposal-version -1 :trans-version "20140605" :date "11-Nov-2014 21:12:51.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0 1421690659786 Using ephemeris for target 14040-11-2014S4-GIBBS ephemeris data for target 14040-11-2014S4-GIBBS does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 14.305 to 16.090. ephemeris interval: 14.365 to 17.001 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14040 :visit-id "11" :proposal-version -1 :trans-version "20140605" :date "19-Jan-2015 13:04:19.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14040 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14040 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2766 :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 3222 :pcs-gap 0 ) true 1 0