POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTURE
POS TARG OUTSIDE OF APERTUREI just realized I had not yet "committed" the new IR target coordinates (to start away from the galaxy cores) and I'm not sure if they are automaitically saved upon submission. -- Max Mutchler2095032071----- Attempting Submission 1 (Fri Dec 09 20:06:34 GMT 2016) -----
----- Attempting Submission 2 (Tue Dec 27 21:22:58 GMT 2016) -----
HST Phase II Proposal 14913 (14913_IRsequence.apt) successfully submitted.
Receipt: # 14913-2
----- Attempting Submission 3 (Tue Dec 27 21:27:01 GMT 2016) -----The "POS TARG out of aperture" warnings are expected when using the DASH (gyro) pointing strategy -- Max MutchlerWFC3 imaging of galaxy pair NGC 4298 and NGC 4302NGC 4298 is a face-on spiral galaxy and NGC 4302 is an edge-on galaxy. They are a close galaxy pair in the Virgo Cluster which may be lightly interacting. We will perform optical imaging with WFC3/UVIS in a 2x2 mosaic, plus ACS parallel exposures. We will perform infrared imaging with WFC3/IR in a 2x3 mosaic. Our IR mosaic will be executed with maximum efficiency using the drift-and-shift (DASH) gyro-mode pointing strategy.For the optical imaging we will execute a 2x2 mosaic with WFC3/UVIS in three broadband filters (g, V, and r). We will also obtain broad V imaging of the parallel ACS field. For the infrared imaging we will execute a 2x3 mosaic with WFC3/IR in two filters (J and H). For maximum efficiency we will utilize the gyro-mode pointing strategy known as DASH (and no ACS parallel exposures, due to buffer limitations). The following is adapted from the WFC3 STAN article issued 23 June 2016 by Ivelina Momcheva, Pieter van Dokkum, Gabriel Brammer, and John MacKenty:
The drift-and-shift (DASH) method of observations, introduced in Cycle 24 (Momcheva et al. 2016), allows users to carry out wide-shallow observations with the WFC3/IR camera on the Hubble Space Telescope (HST) by guiding on gyros alone. The DASH observing strategy must balance between the amount of data that can be stored in memory during the exposure, the drift rate, and the sampling frequency. It also depends on the target position in the sky, as that determines the orbital visibility period. We selected a read-out mode that matched the drift rate. With SPARS25 mode (25-second reads), the drift is only about one quarter of a WFC3/IR pixel between consecutive non-destructive reads. The maximum number of pointings that fit within an orbit with this readout mode is eight, four with NSAMP=11 and four with NSAMP=12, with total exposure times of 253 and 278 seconds, respectively. No modifications to APT are needed to plan these observations. To implement DASH observations in APT, on the Proposal Information page, select the Program Coordinator Use Only box. This option allows users to manually specify the Pointing Control System (PCS) mode. Each tile of the mosaic is defined as an exposure within a visit. The first target within a visit is a Fixed Target. Subsequent targets can be specified either as Fixed Target or as POS TARG offsets relative to the first target (when the observations are carried out, the telescope will step from one pointing to the next, without returning to the starting position). The two methods of specifying the positions of the exposures are equivalent. The POS TARG warning that the offset is larger than the instrument field of view can be ignored. The guiding mode is set by Exp PCS Mode. This option is in the Form Editor Exposure section Implementation Requirements (only visible if PC Use Only is checked). Set this option to Fine for the first exposure and Gyro for subsequent exposures. The same can be done in the lowest table panel (Exp PCS Mode is the ninth field from the right). A guide-star acquisition is required at the beginning of each orbit. Observers should carefully consider the offset pattern to minimize the length of moves. Offsets up to 1.0 degree are possible with a small angle maneuver (SAM); however, the repositioning overheads increase with the offset size.Galaxies0AVAILABLECLUSTER OF GALAXIESGALAXY PAIRINTERACTING GALAXYYESThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000CLUSTER OF GALAXIESGALAXY PAIRINTERACTING GALAXYYESThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000POS-TARGDITHER2.0LINEfalsefalse386LINE1falseHst Same orient constraint links visits (01 11 12 13 14 15)The scheduling data was generated by CASM 24.2.CASM was run in Phase II mode./private/var/folders/tj/27ygn_756lz3w1z19s6wtgtm0006vh/T/OPVisit5603734171017219636.xml(Tic-Visit
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