shortened exposures, changed orient to allow scheduling Feb 17-18 ----- Attempting Submission 2 (Tue Jan 27 17:05:33 GMT 2009) ----- The Integral Sign Galaxy We will observe the unusual warped disk galaxy known as the Integral Sign Galaxy, UGC 3697, with a small two-position WFPC2 mosaic. Observations will be obtained in three broad band filters and the resulting image will be released on the 19th anniversary of the launch of the Hubble Space Telescope on ~April 24, 2009. Multidrizzled mosaics will be made available through the archive.
We will utilize a well-tested extragalactic observing sequence for our observations that is designed for maximum efficiency. The main goal of this sequence is to go as deep as possible by using wide filters available in WFPC2. We will use the F450W, F606W and F814W filters to achieve this goal. The redshift of this object precludes the use of a separate H-alpha filter. At each pointing we will observe a 2-orbit sequence in the F450W, F606W, and F814W filters. Each filter will be dithered in a four-position sub-pixel dither pattern with two dither positions per orbit. We can obtain a total of 5600s exposure per filter at each of the two mosaic positions. In the heavily shaded region of Fig.2 the total integration time per pixel will be doubled. The proposed sequence requires a total of 12 orbits. The full galaxy will be observed with a 2-position mosaic (Fig.2). The mosaic is constructed by stepping one WF chip width (with allowance for overlap) between each pointing. During February we are able to observe this galaxy at an orient that produces a slightly diagonal layout (Fig.2) that is the preferred orientation for creating a sense of motion and dynamism in an image. Observations are possible in March as well, if necessary, but we need to have the data in hand by the third week of March at the latest to allow sufficient time for data processing and the standard news approval process. We request the use of sched 30 which allows 2800s of integration per orbit for this high dec target. We have checked in APT and there is no change in available windows in Jan-Feb 2009 when going from sched 70 to sched 30. This change allows us to avoid needlessly wasting observing time and S/N with no impact to schedulability. The observations must be made by ~March 21, 2009 to allow sufficient time to process the images before the April launch anniversary. We prefer observations in late January or February if possible. We will divide the observing into at least three independent visits to minimize scheduling complications, though we will require all observations to be made at (nearly) the same orient. UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE 0 false 0.0 0.0 false false false false false SUPPORTED GALAXY DUST LANE BULGE INTERACTING GALAXY This object was generated by the targetselector and retrieved from the NED database. J2000 07 11 22.5000 +71 50 11.00 J2000 WFPC2 Imaging No F450W WFPC2 Imaging No F606W WFPC2 Imaging No F814W POS-TARG MOSAIC DITHER 4 74 WFPC2-BOX false 143.130102 false 0.559017 0.559017 2 0 POS-TARG LINE 26.56505 1 true Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit61493.xml (Tic-Visit :proposal-id 11989 :visit-id "01" :proposal-version -1 :trans-version "20080807" :date "27-Jan-2009 12:03:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 358528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11989 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11989 :visit-id "01" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2660 :al-overhead-at-end 100 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "01" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2694 :al-overhead-at-end 66 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "01" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2660 :al-overhead-at-end 100 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "01" :orbit-number 4 :pcs-time 355 :si-vis-utilization 2640 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) true 4 0 Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit61494.xml (Tic-Visit :proposal-id 11989 :visit-id "02" :proposal-version -1 :trans-version "20080807" :date "27-Jan-2009 12:03:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 358528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11989 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11989 :visit-id "02" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2660 :al-overhead-at-end 100 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "02" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2694 :al-overhead-at-end 66 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "02" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2660 :al-overhead-at-end 100 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "02" :orbit-number 4 :pcs-time 355 :si-vis-utilization 2640 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) true 4 0 Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. /private/tmp/OPVisit61495.xml (Tic-Visit :proposal-id 11989 :visit-id "03" :proposal-version -1 :trans-version "20080807" :date "27-Jan-2009 12:03:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "26" :si-bright-earth-limb-angle 20.0 :data-volume 358528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11989 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11989 :visit-id "03" :orbit-number 1 :pcs-time 355 :si-vis-utilization 2660 :al-overhead-at-end 100 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "03" :orbit-number 2 :pcs-time 355 :si-vis-utilization 2694 :al-overhead-at-end 66 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "03" :orbit-number 3 :pcs-time 355 :si-vis-utilization 2660 :al-overhead-at-end 100 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11989 :visit-id "03" :orbit-number 4 :pcs-time 355 :si-vis-utilization 2640 :al-overhead-at-end 120 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3097 :pcs-gap 0 ) true 4 0