DD request for newly discovered main belt comet. -816349335 Assigned ID: 3810 ----- Attempting Submission 1 (Wed Sep 28 03:15:23 GMT 2022) ----- This pattern is not used in this proposal. Fourth submission for Phase 2 of this program. Revised Orbit 2, added BETWEEN restrictions to avoid bleeding from a bright near by star and avoid when moving target passed in front of a background star. Also updated the Moving Object elements for Orbit 2. The object has now been officially designated:Comet P/2022 R5 = P21xDaC (Oct. 6.33 UT) [see MPEC 2022-T88] remove 1 hour from the end of each between 2028163077 ----- Attempting Submission 1 (Tue Oct 04 19:17:25 GMT 2022) ----- ----- Attempting Submission 2 (Tue Oct 04 20:18:40 GMT 2022) ----- ----- Attempting Submission 3 (Wed Oct 05 01:34:25 GMT 2022) ----- ----- Attempting Submission 4 (Wed Oct 19 04:07:15 GMT 2022) ----- ----- Attempting Submission 5 (Wed Oct 19 13:46:00 GMT 2022) ----- The warning relate to (1) a ditter pattern we decided not to use but are keeping in case it is needed. Determining the Driver of Activity in a Newly Discovered Main Belt Comet On 2022 September 8, Pan-STARRS detected a dust tail / trail associated with a new main-belt asteroid candidate. Confirming follow-up observations with the 3.6m Canada-France-Hawaii Telescope on September 22 show a tail corresponding to at least 25,000 km length in space. A search of the Pan-STARRS image archive shows no matching object in pre-discovery images, nor could the recent astrometry be linked to any existing asteroid, or isolated tracklets, implying that this is a new discovery that was not previously visible. Something happened recently to trigger significant activity, resulting in an increase in brightness by at least 2 orders of magnitude. We propose a DD programme of WFC3 imaging over two orbits. Only HST will allow us to study the changing morphology of the dust structures and thus differentiate between continuous mass-loss and an impulsive event. Optical imaging observations to explore the dust surrounding an active asteroid. We request a total time baseline for observations of approximately two months, with visits spaced roughly equally, to enable robust measurements of the evolution of the dust structure and of the velocity of any detected fragments. While we would like to observe the asteroid as soon as possible, disruptive scheduling is not warranted. Our basic observing strategy is to take multiple long exposures using WFC3 and the F350LP wide bandpass filter. Jacqueline Keane - Expert in interpreting comet activity data, familiar with HST. She will help collect the associated ground based observations and process the data so we can develop the best estimate of when to initiate the observations. Karen Meech - Expert on interstellar object observations and coordinating international teams. Expert on comet observations and interpretation, including rotation analysis. Robert Weryk - Pan-STARRS NEOWISE survey program teman member. He is instrumental in getting additional astrometric data as needed when other telescopes do not have imagers on. This will be important for orbit refinement early in the program. Richard Wainscoat - Lead for the Pan-STARRS NEOWISE survey program. He is instrumental in getting additional astrometric data as needed when other telescopes do not have imagers on. This will be important for orbit refinement early in the program. Jan Kleyna - Comet expert and expertise with innovative programming for data reduction. He will be a key team member for the analysis of the data to determine the driver of the activity. Solar System Astronomy 0 false SUPPORTED SOLAR SYSTEM NO ASTEROID Active asteroid in the main asteroid belt. TYPE=ASTEROID,A=3.0705665,E= 0.1956716,I=15.29185,O=115.06373,W=240.71338,M=23.81960201,EQUINOX=J2000,EPOCH=05-OCT-2022:00:00:00,EpochTimeScale=UTC EARTH SOLAR SYSTEM ASTEROID asteroid TYPE=ASTEROID,A=3.070266776415772,E=0.1955671799352209,I=15.29187909037629 ,O=115.062336313636,W=240.7237704225099,M=21.80331790047074,EQUINOX=J2000,EPOCH=24-SEP-2022:00:00:00,EpochTimeScale=TDB EARTH WFC3/UVIS Imaging No No F350LP POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 1 false POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 2 false Using ephemeris for target 17254-01-P21XDAC ephemeris data for target 17254-01-P21XDAC does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.265 to 24.182. ephemeris interval: 22.273 to 24.275 Timing link suitability includes constraints ([02 After 01 by 21.0 to 45.0 days]) The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. 1666456303000 290.6538263360284 (Tic-Visit :proposal-id 17254 :visit-id "01" :proposal-version -1 :trans-version "20220630" :date "18-Oct-2022 17:41:57.0" :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 422320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17254 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17254 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2608 :al-overhead-at-end 0 :internal-dur-at-end 498 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 Using ephemeris for target 17254-02-P21XDAC2 ephemeris data for target 17254-02-P21XDAC2 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 22.265 to 24.182. ephemeris interval: 22.273 to 24.275 Timing link suitability includes constraints ([02 After 01 by 21.0 to 45.0 days]) The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17254 :visit-id "02" :proposal-version -1 :trans-version "20220630" :date "18-Oct-2022 17:41:58.0" :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 422320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17254 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17254 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2608 :al-overhead-at-end 0 :internal-dur-at-end 498 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0