Due to the small schedulability window of these observations, we would sincerely appreciate a scheduling feedback ASAP, so we can change the observation structure as needed. Note that the exposure times for each of the filters are also just an initial guess, and will be updated later pending more accurate ETC calculations, so we are more concerned of how feasible the overall scheduling is. If conditions are too tight, we can likely use the less optimal 90 degree roll offset available in early 2024, though the current orient is preferred.
Update 09/19: 2 6 orbit visits broken up into 6 2 orbit visits to aid in scheduling. Exposure times refined to give better SNR balance between filters.
Update 09/21: The updated mosaic's position did not successfully commit in previous submission (though it appeared that way in Aladin), and so the mosaic was not properly centered. This is the sole update with this submission, apologies.
Update 12/07: Recreated mosaic strategy to work with available orients in January, shortened orbits slightly to widen schedulability.
Update 12/08: Removed the spurious repeated orient constraint, widened mosaic-564928911----- Attempting Submission 1 (Tue Aug 15 17:37:53 GMT 2023) -----
----- Attempting Submission 3 (Tue Sep 19 20:43:14 GMT 2023) -----
----- Attempting Submission 4 (Thu Sep 21 17:13:14 GMT 2023) -----
Your proposal could not be saved.
Submission aborted.
----- Attempting Submission 5 (Thu Dec 07 20:17:46 GMT 2023) -----
HST Phase II Proposal 17398 successfully submitted.
Receipt: # 17398-5
----- Attempting Submission 6 (Fri Dec 08 17:51:15 GMT 2023) -----Narrowband Imaging of M76We propose to take deep narrowband imaging of the Little Dumbbell Nebula, M76. Deep H-alpha, [NII], 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 planetary nebula M76. We propose a 1x2 mosaic of WFC3 pointings at an orient of 145 degrees. We employ a 3-point stretched gap dither pattern which fills the chip gaps, expands the field a bit, and also mitigates scattered light concerns from the somewhat crowded star field. With 6 orbits per pointing and 2 mosaic tiles, we request 12 orbits. We include deep narrowband imaging with filters that isolate key emission bands for planetary nebulae: F502N for [O III], F656N for H/alpha, and F658N for [N II] which is quite strong in M76. We also include short exposures with broadband B and I filters (F475W, F814W) for star colors, continuum subtraction, and overall archival value. For each of the two tiles we employ a three point stretch dither, with each dither point also utilizing a two point chip gap dither, to ensure evenness of coverage over the imaged area. M76 extends over a 2.7 x 1.8 arcmin area, with the brightest region being a central stripe with two fainter lobes extending to the side. For our chosen dither pattern, and using the WFC3/UVIS Exposure Time Calculator with the planetary nebula spectrum from Kwitter & Henry, 1996, we can achieve a signal-to-noise ratio of > 50 for each resolution element in 2 orbits per tile for the filters F656N, F658N, and F502N for even the fainter lobes of the nebula. We can obtain 2-color short broadband imaging in F475W and F814W at the beginning and end of orbits. These short exposures can be added to the beginning and end of the visits for longer exposures. This target is schedulable in late November 2023 at the desired orient. In the event of any failed observation the target remains schedulable for repeat observations through late February 2024, although at somewhat less-desirable orientations. Scheduling as early as possible is ideal, so we have submitted the orient that is available earliest. We stress that 90 deg orientations are possible and more widely schedulable at later times.The team has a wealth of experience in planning Hubble imaging for a variety of targets and scientific objectives. Specifically, the team has expertise in proposal planning for complex mosaics, as well as obtaining high SNR images of emission lines with optimal observation strategies, and planning for contingencies such as observation failures.0falseSUPPORTEDEXT-STAREMISSION LINE NEBULAPLANETARY NEBULA CENTRAL STARYESThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000POS-TARGMOSAICDITHER42.414WFC3-UVIS-DITHER-BOXfalse81.785false0.1120.173285.759POS-TARGWFC3-UVIS-GAP-LINE23.8845falseHst Same orient constraint links visits (07 08 09 10 11 12)The scheduling data was generated by CASM 31.1.CASM was run in Phase II mode.(Tic-Visit
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