0 Assigned ID: 62 ----- Attempting Submission 1 (Mon Apr 06 20:07:50 GMT 2015) ----- FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. Set Visit 2 schedulability to 100. Reduced FQ727N and FQ937N exposures sligthly, as well setting FQ889N CR-SPLIT=NO. Schedules fine now. 1035463693 ----- Attempting Submission 1 (Fri Jul 17 15:26:14 GMT 2015) ----- HST Phase II Proposal 14113 (STIS_WFC3_C23_phsII.apt) successfully submitted. Receipt: # 14113-1 ----- Attempting Submission 2 (Fri Jul 17 17:40:26 GMT 2015) ----- Missing FLASH due to bright extended target with scattering so CTI should not be a problem. POS TARGS for quad filters are offset closer to center of chip pair to reduce move when switching between quads. Target is out of vignetted region, and these position have been used in the past. We propose three STIS orbits to obtain spatially resolved 300-1000 nm spectra of the ice giant Uranus and one WFC3 orbit in support of complex STIS calibration corrections. Similar observations made in 2012 revealed an equatorial rise in methane since 2002 and a high-latitude depletion in the north comparable to that seen in the south in 2002, in defiance of expectations. Both low-latitude and polar regions displayed small scale latitudinal variations that are potential indicators of vertical motions. A brightening of the polar region in 2014 suggests either aerosol increases or further decreases in methane or a combination of these effects. The improved view of the north polar region in late 2015 will allow extension of our analysis to higher latitudes and measurement of temporal changes at most latitudes accessible in 2012. We will use differences in methane and hydrogen absorption near 825 nm to constrain the methane distribution over the latitude range from 25 S to 90 N. During its orbits the STIS slit will be aligned parallel to Uranus' polar axis and stepped from the edge to the center of the disk, taking advantage of the zonal symmetry of Uranus to reduce total observing time by half. These results will be relevant to extra-solar science, as Uranus represents a size class that is abundant among Kepler extra-solar planet candidates. HST provides wavelength coverage with spectral and spatial resolution not available from any other facility due to Uranus' small angular size, and this capability may not be available in the near future due both to limited HST lifetime and the expected eventual formation of an obscuring north polar haze on Uranus. Re-observe Uranus with STIS, as was done in 2002 (Program 9035); 3 orbits. One orbit of WFC3 imaging. Original description from Program 9035 (updated slightly): During the first orbit, we will use STIS with grating G430L and a 0.1" slit for wavelengths 290-570 nm and 70 second exposure time each. The slit orientation with be parallel to the central meridian. Considering overhead times, 13 positions will be possible distributed between the central meridian and the evening limb equally spaced by 0.15". At wavelengths below 540 nm, Uranus does not display much latitudinal contrasts. Thus, the significant center-to- limb variations are expected to be well recorded by those slit positions. For the next two orbits, we propose to use STIS with grating G750L and 0.1" slit for wavelengths 524- 1027 nm and 86 second exposure time each. Sampling the 1.85" radius of Uranus at 0.056" sampling from central meridian to evening limb with an additional exposure on each side to account for impecfect centering in the acquisition requires 36 exposures (18 per orbit). We plan to read out only 7" around Uranus to reduce overhead times. For both gratings, we expect about 5, 000 electrons per pixel at the brightest part of Uranus at the brightest wavelength, which typically gives signal-to-noise ratios of 50 per pixel. The gain 1 setting will be used. Wavecals and G750L fringe flats will be scheduled between orbits. Overhead for data management will not be required since we will read out only 140 rows. The target acquisition will be a diffuse acquisition on Uranus with flux-centered checkbox of 33 pixels with aperture F28X50LP and 5 sec exposure time. The target acquisition exposure will help in the navigation of the exposures with the G750L grating. The overlapping spectral region will facilitate navigation of the remaining exposures. We tested our target acquisition method with WFPC2 images in 21 different filters. The root-mean-square deviation in east-west centering between our acquisition method and a limb fitting method was 0.03". The deviation was only 0.02" for an average image of many red and near-infrared WFPC2 images which approximates the throughput of the F28X50LP aperture. Thus, we are confindent that centering on Uranus will be more accurate than required. -------- Realtime Justification -------- Time-critical observations: In order to take advantage of the almost perfect east-west symmetry of Uranus (to a lesser degree of Neptune), the slit needs to be aligned along the central meridians. This restricts scheduling of the observations within a few days of opposition for Uranus. ------ Calibration Justification ------- The STIS wavecals and G750L fringe flats have been specified to occur at the end of the orbits so that they may occur during occultation. --------- Additional Comments ---------- All WFC3 exposures have CR-SPLIT=NO to reduce overhead. POS-TARG offsets for quad filter WFC3 exposures have been specified to place target approximately 20 arcseconds closer to center of array relative to "optimal" aperture locations. This places the planet approximately 10 arcseconds towards the center of the array relative to the "QUAD-FIX" fiducial points. This has been done to reduce telescope move magnitudes (between different quads), while still leaving a 512 x 512 pixel area around the target outside of the quad filter vignetted regions. The proposal uses "available" (WAVECAL=NO) and "pc use only" (wavecal exposure NEW ALIGNMENT) features to allow suppression of WAVECALS from beginning of orbits (they have been specified at the end of the orbits) and to allow WAVECALS to run into occultation, respectively (from program 12894 PC instructions). We have added postflash to the narrowband long-wavelength exposures, as they are the only ones that show CTI trails from CR hits (see program 12894 WFC3 exposures). Uranus is bright enough that it and scattering from it make postflash unnecessary in the remaining exposures. SOLAR SYSTEM 12 false false false false AVAILABLE SOLAR SYSTEM PLANET Uranus target for WFC3 STD=URANUS B-V = 0.56 EARTH SOLAR SYSTEM Note Uranus' pole PA is 256.25 deg (E from N) at opposition on 12 OCT 2015, so offset angle is PA+90 deg. PLANET OFFSET TO LIMB FROM URANUS CENTER STD=URANUS TYPE=POS_ANGLE,RAD=1.8252,ANG=346.25,REF=NORTH B-V=0.56 EARTH SOLAR SYSTEM Note Uranus' pole PA is 256.25 deg (E from N) at opposition on 12 OCT 2015, so offset angle is PA+90 deg. PLANET OFFSET TO LIMB FROM URANUS CENTER STD=URANUS TYPE=POS_ANGLE,RAD=1.91224,ANG=346.25,REF=NORTH B-V=0.56 EARTH SOLAR SYSTEM Note Uranus' pole PA is 256.25 deg (E from N) at opposition on 12 OCT 2015, so offset angle is PA+90 deg. PLANET OFFSET HALFWAY TO LIMB FROM URANUS CENTER STD=URANUS TYPE=POS_ANGLE,RAD=0.89984,ANG=346.25,REF=NORTH B-V=0.56 EARTH STIS/CCD Spectroscopic No No G430L 4300 STIS/CCD Spectroscopic No No G750L 7751 STIS/CCD Imaging No No F28X50LP WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F467M WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F631N WFC3/UVIS Imaging No No FQ727N WFC3/UVIS Imaging No No F763M WFC3/UVIS Imaging No No F845M WFC3/UVIS Imaging No No FQ889N WFC3/UVIS Imaging No No FQ937N WFC3/UVIS Imaging No No F665N WFC3/UVIS Imaging No No F953N CELESTIAL MOSAIC 0.1521 Note Uranus' pole PA is 256.25 deg (E from N) at opposition on 12 OCT 2015, so pattern orient is PA-90 deg, as the starting offset is PA+90 deg. Step size is three STIS pixels, and stepping from limb to planet central meridian requires 13 steps. LINE false false 13 166.25 LINE 1 false CELESTIAL MOSAIC .05624 Note Uranus' pole PA is 256.25 deg (E from N) at opposition on 12 OCT 2015, so pattern orient is PA-90 deg, as the starting offset is PA+90 deg. Step size is R/(2N-1-2), where R is target's angular radius (1.8563") and N is number of exposures in one orbit (2N is total exposures for this grating). LINE false false 18 166.25 LINE 2 false 1437391916737 /solaris/user1/williamj/work/OP-cache/14113-v01.xml Timing link suitability includes constraints ([02 After 01 by at most 7.0 days]) The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14113 :visit-id "01" :proposal-version -1 :trans-version "20150609" :date "20-Jul-2015 07:31:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 251056 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14113 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 14113 :visit-id "01" :obset-id "A1" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 14113 :visit-id "01" :obset-id "B1" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 14113 :visit-id "01" :obset-id "C1" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14113 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2659 :al-overhead-at-end 0 :internal-dur-at-end 430 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2992 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14113 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2757 :al-overhead-at-end 0 :internal-dur-at-end 704 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2992 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14113 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2752 :al-overhead-at-end 0 :internal-dur-at-end 720 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2992 :pcs-gap 0 ) false 3 0 Observer-specified WAVECAL inserted at end of orbit to run into occultation. Observer-specified WAVECAL inserted at end of orbit to run into occultation. Observer-specified Fringe Flat to correct near-IR fringing. To be run in occultation. Observer-specified WAVECAL inserted at end of orbit to run into occultation. Observer-specified Fringe Flat to correct near-IR fringing. To be run in occultation 1437154378593 Timing link suitability includes constraints ([02 After 01 by at most 7.0 days]) The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. WFC3 Uranus images for I/F calibration of STIS observations. (Tic-Visit :proposal-id 14113 :visit-id "02" :proposal-version -1 :trans-version "20150609" :date "17-Jul-2015 12:32:58.0" :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 246112 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14113 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14113 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2654 :al-overhead-at-end 0 :internal-dur-at-end 305 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2992 :pcs-gap 0 ) true 1 0