0 Assigned ID: 5931 ----- Attempting Submission 1 (Thu Sep 19 19:48:31 GMT 2024) ----- This is the initial submission. We use a standard 3-point gap dither, but use POS TARGs so we can get fewer dithers for the short broadband exposures. We include a desired orient, but a wider range exists over then next several months so this could be relaxed for schedulability. -- Max Mutchler -787881639 ----- Attempting Submission 1 (Tue Sep 24 21:01:31 GMT 2024) ----- We propose to take deep narrowband imaging of the H II region Caldwell 49. Deep H-alpha, [N II], and [OIII] images in F656N, F658N, and F502N will sample different density and temperature regions within the nebula. We will obtain high signal-to-noise imaging of a portion of the Rosette Nebula in narrow and broadband filters F502N, F656N, F658N, F438W, F555W, and F814W. We propose a single WFC3 pointing which will adequately cover the features shown. In the event of needing to retake a failed visit, we will attempt to match the Position Angle; in the event that this is not possible to schedule in Reduced Gyro Mode, we will crop the image background as necessary so that no part of the publicized image is missing one or more colors. We expect that some visits may need to be repeated because of guide star failures, and will allow for the possibility that some make-up observations may themselves suffer guide-star failures. Dither strategy will be arranged to minimize the impact of variation of the PA. at an orient of 90-120 degrees to maximize the schedulability of make-up observations in the event of guide star failures while balancing the ease of scheduling. This orient is schedulable in multiple windows. We will also employ a dither pattern which fills the chip gaps and enables cosmic ray rejection. The brightest parts of the nebula are up to an order of magnitude brighter than the average surface brightness. Using spectra typical of H-II regions as a guide to emission line ratios, we use the WFC3 ETC to estimate exposure times and find that we can create high signal-to-noise images with 7200s for [N II], 2400s for [O III], and 2400s for H-alpha, with broadband images to color-balance stars in the bookends of each orbit. We therefore request 6 orbits for this target. The team has a wealth of experience in making outreach images for the Hubble Space Telescope and is responsible for creating Hubble images viewed by billions of people world-wide, includingthe 31st, 32nd, 33rd, and 34th anniversary images which together were viewed over 3 billion times. The team includes decades of experience in writing Hubble news releases, designing informal educational and outreach products based on Hubble data, as well as instrument expertise specializing in treatment of WFC3 data. Stellar Populations and the Interstellar Medium 0 false SUPPORTED ISM HII REGION This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. CALDWELL-49 J2000 WFC3/UVIS Imaging No No F502N WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F656N WFC3/UVIS Imaging No No F658N 1727211296603 /private/var/folders/tj/27ygn_756lz3w1z19s6wtgtm0006vh/T/OPVisit5696862072951079150.xml The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. 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