Assigned ID: 78 ----- Attempting Submission 1 (Wed Feb 22 00:17:55 GMT 2012) ----- HST Phase I Proposal 78 (maffei20a.apt) successfully submitted. ----- Attempting Submission 2 (Thu Feb 23 19:21:54 GMT 2012) ----- ----- Attempting Submission 1 (Thu Jul 05 15:40:03 GMT 2012) ----- Exposing the Maffei Group Accurate distances can be determined for nearby galaxies from the luminosities of stars at the Tip of the Red Giant Branch (TRGB). There is now detailed information on the distribution of galaxies within 4 Mpc at high Galactic latitudes. Radial velocities are known to a few km/s from HI observations and distance measurement with 6% accuracy permit the parsing of peculiar velocities from the cosmic expansion at the level of 15 km/s. Dynamic models of the region within 4 Mpc are becoming increasingly sophisticated with the result that our understanding of the distribution of matter is increasingly detailed. However there is a problem. The greatest tidal influence on the Local Group comes from the Maffei - IC342 complex at low Galactic latitudes and its members are heavily obscured. We need to know the distances and masses of the members of this complex in order to accurately reconstruct the orbital history and map the mass distribution of the Local Group. There has been limited success studying the Maffei region with observations shortward of 1 micron but accurate distances can be obtained with observations in the infrared. The TRGB is extremely bright in the infared and obscuration is not such a problem. Three important and heavily obscured objects requiring two orbits each will be observed with WFC3/IR through the F110W and F160W filters. Parallel observations with ACS through the F814W and F606W filters will contribute to an accurate measurement of line-of-sight extinction. Three principal and highly obscured galaxies in the nearest group: Maffei 1, Maffei 2, and IC 342 will be observed simultaneously with WFC3/IR as primary and ACS/WFC in parallel with two orbits each. The exposures times will be divided between F110W and F160W filters with account for obscuration. We are guided by the exposure times used in the course of program SNAP 11719 (PI Dalcanton) with galaxies at similar distances, though less obscured. All three the galaxies are large, having extinction corrected Holmberg diameters within 12 - 30 arcminutes. We point the WFC3/IR camera about 5-6 arcmin away from the galaxy center in each case. Position of the ACS on the galaxy body may be chosen more or less arbitrary, simply avoiding crowded HII-regions in the galaxy as well as bright foreground stars. We follow dithering procedures demonstrated to be optimal for psf reconstruction. The photometry is carried out with the software DOLPHOT, the successor to HSTPHOT (Dolphin 2000), enhanced to be used with WFC3 data. Calibration of the TRGB in the F110W filter is carried out using archival data from SNAP 11719 observations, using the same F110W and F160W filters. Parallel observations of adjacent fields will be made with ACS through the F814W and F606W filters. The color displacement of the Zero Age Main Sequence will be used to determine the reddening in the line-of-sight. RESOLVED STELLAR POPULATIONS 12 false 0.0 0.0 false false false false SUPPORTED GALAXY ELLIPTICAL This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY AMORPHOUS IRREGULAR SPIRAL This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY SPIRAL This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W POS-TARG DITHER 0.636 LINE false false 4 41.788 WFC3-IR-DITHER-LINE 3 false The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /home/roman/apt_Maffei/OP-cache/MaffeiGrAPT-12877-v01.xml (Tic-Visit :proposal-id 12877 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 17:30:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1693968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12877 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12877 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 1037 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3039 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /home/roman/apt_Maffei/OP-cache/MaffeiGrAPT-12877-v02.xml (Tic-Visit :proposal-id 12877 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 17:20:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1693968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12877 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12877 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 1037 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3039 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /home/roman/apt_Maffei/OP-cache/MaffeiGrAPT-12877-v03.xml (Tic-Visit :proposal-id 12877 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 17:30:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1693968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12877 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12877 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 1037 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3039 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /home/roman/apt_Maffei/OP-cache/MaffeiGrAPT-12877-v04.xml (Tic-Visit :proposal-id 12877 :visit-id "04" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 17:30:04.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1693968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12877 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12877 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 1037 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3039 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /home/roman/apt_Maffei/OP-cache/MaffeiGrAPT-12877-v05.xml (Tic-Visit :proposal-id 12877 :visit-id "05" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 17:30:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1693968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12877 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12877 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 1037 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3057 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /home/roman/apt_Maffei/OP-cache/MaffeiGrAPT-12877-v06.xml (Tic-Visit :proposal-id 12877 :visit-id "06" :proposal-version -1 :trans-version "20120604" :date "05-Jul-2012 17:30:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1693968 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12877 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12877 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 1037 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3057 :pcs-gap 0 ) true 1 0