0 Assigned ID: 463 ----- Attempting Submission 1 (Fri Feb 24 16:23:05 GMT 2012) ----- Revised values for FLASH parameters and restringed values for ORIENT according to the support scientist. -1098042552 ----- Attempting Submission 1 (Tue Jul 10 22:44:56 GMT 2012) ----- ----- Attempting Submission 2 (Wed Sep 26 11:25:49 GMT 2012) ----- Abell 30 and Abell 78 are ``born-again'' planetary nebulae whose central stars have experienced a very late thermal pulse. This event led to the ejection of hydrogen-poor material some 1000 yr ago. This ejecta is being photo-evaporated and swept up and accelerated by a newly developed fast stellar wind. We have used archival HST F502N ([O III]) and F555W images to detect the expansion of the ejecta knots in Abell 30. We request new WFC3/UVIS [O III] images of Abell 30 and Abell 78 to be compared with WFPC2 [O III] images taken in the mid 90's. The comparison will allow us to determine the expansion rate and geometry of the hydrogen-poor ejecta, estimate the time since the born-again event, and study the interaction of fast stellar winds with material photo-evaporated from the hydrogen-poor knots. We propose to acquire HST WFC3/UVIS F502N images of the planetary nebula Abell 30 and Abell 78. Previous HST WFPC2-PC F502N images of Abell 30 and Abell 78 were obtained on 1994 March 6 and 1995 July 11, so the new images will be used to study the nebular expansion of the innermost regions of these planetary nebulae. Given the target declinations, their visibilities are at least 54 minutes. Accounting for guide-star acquisition and WFC3/UVIS overheads, four exposures of 600 seconds each can be acquired in one orbit per object. ISM AND CIRCUMSTELLAR MATTER 12 false 0.0 0.0 false false false false SUPPORTED ISM BIPOLAR OUTFLOW EJECTA KNOT PLANETARY NEBULA This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ISM BIPOLAR OUTFLOW EJECTA KNOT PLANETARY NEBULA This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F502N WFC3/UVIS Imaging No No F502N POS-TARG MOSAIC DITHER 2 2.414 WFC3-UVIS-DITHER-LINE false false 0.145 2 85.759 POS-TARG WFC3-UVIS-GAP-LINE 46.84 1 true 1348658696848 /private/var/folders/OH/OHyojp99EIOVuC2EebFzvU+++TI/-Tmp-/OPVisit8246737586639400771.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12935 :visit-id "01" :proposal-version -1 :trans-version "20120802" :date "26-Sep-2012 13:24:56.0" :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12935 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12935 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2910 :al-overhead-at-end 122 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3244 :pcs-gap 0 ) true 1 0 1348658706706 /private/var/folders/OH/OHyojp99EIOVuC2EebFzvU+++TI/-Tmp-/OPVisit8650282406354648330.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12935 :visit-id "02" :proposal-version -1 :trans-version "20120802" :date "26-Sep-2012 13:25:06.0" :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12935 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12935 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2934 :al-overhead-at-end 122 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3267 :pcs-gap 0 ) true 1 0