Scientific Category is a required field. Science Keywords: Select from 2 to 5 items. 0 Assigned ID: 4957 ----- Attempting Submission 1 (Wed Feb 07 11:50:28 GMT 2024) ----- Joint NRAO/HST PATTERN POSITION OUTSIDE APERTURE Update (Nov 12, 2024): To avoid glint (in addition to ghosts and dragon's breath) I have moved the target to the lower left of the ACS/WFC FoV and tightened the orient constraints to keep the two brightest nearby stars away from the chip. This does impact scheduleability, but it is still viable for about a week in March 2025. I attempted to place the target in other corners of the detector, but this led to orient constrains with no schedule windows. Old comments (Nov 12, 2024): I think it's likely that ghosting might be an issue and these ghost could potentially fall on our target, deepening on the orientation. I decided to offset the target from the center of the FoV more to avoid placeing the bright stars in the lower right of the FoV, and I've slightly squeezed the orient constrains to help prevent potential dragon's breath from stars being near the edge of the chip with the new positioning. This makes almost no difference to the scheduleability, but let me know if it's an issue and I can tweak it again. Old comments: There is a bright (M_V ~ 12) star about 1 arcmin to the NE of our target. This star will likely cause dragon's breath, bleed trails, and/or diffraction spikes in the CCD. We have decided to place this star on the chip (requiring a POS TARG offset), but have placed mild ORIENT constraints on the observation to attempt to prevent the diffraction spikes/bleed trails from going through our target. This has almost no impact scheduleability. There are other similarly bright stars in the field, but these are further from our target and less of a concern. We have have removed the parallel pointing in WFC3 as the buffer dumps have become prohibitive given the shorter exposures times resulting from one gyro mode. This will reduce the background field size that we will have available. We will now have assess the background in from the other ACS/WFC chip. 453270723 ----- Attempting Submission 1 (Wed Feb 07 19:48:05 GMT 2024) ----- ----- Attempting Submission 2 (Sun Feb 11 05:57:36 GMT 2024) ----- ----- Attempting Submission 3 (Wed Jul 10 18:31:15 GMT 2024) ----- Your proposal could not be saved. Submission aborted. ----- Attempting Submission 4 (Tue Nov 12 19:09:40 GMT 2024) ----- ----- Attempting Submission 5 (Tue Nov 12 23:30:25 GMT 2024) ----- We have included FLASHes for the WFC3 exposures to attempt to ensure the counts will be above 20. The WFC3 exposures have been removed. We request 3.5h of VLA C-configuration time in order to confirm that a recent HI detection at 500km/s (from GBT) in the direction of a newly identified dwarf galaxy, is localized to that object. In addition, we request 1 orbit of HST in order to measure an accurate tip-of-the-red-giant-branch distance to this galaxy, laying the foundation for a robust study of its nature. This object was detected in public DECaLS images using a combination of an automated search algorithm, a convolutional neural network classifier, and finally, human inspection. Its appearance is reminiscent of Leo P and low-mass dwarfs in the SHIELD sample. It is also semi-resolved in the DECaLS images, suggesting that it is within several Mpc. The nearest large galaxy is NGC5253 (407km/s) and we suspect that this object may be a Leo P analog in another nearby (3.55 Mpc) Milky Way-like system. This object is one of the first we are following up from our novel search and we hope this will act as a proof of concept, demonstrating the viability of this approach for identifying undiscovered Local Volume dwarfs, and will result in further follow-up of additional candidates. These observations target a newly identified candidate extremely low mass, star-forming galaxy. Our primary goal is to resolve its stellar population, to understand its recent star formation history and measure a tip of the red giant branch distance estimate. We follow a standard strategy of approximately 1000 s integrations in F606W and F814W with ACS/WFC and parallel observations in the same filters in WFC3/UVIS. The target is less than 30 arcsec across and has therefore been centered in a single ACS chip and we use only a 2-point line dither and do not fill the chip gap. We have attempted to pack the orbit, making the exposures as long as possible, while permitting all the required buffer dumps. We do not require any orient constraints. na 6 false false false false false false false false SUPPORTED GALAXY AMORPHOUS IRREGULAR J2000 J2000 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.364 LINE false false 2 47.23 ACS-WFC-DITHER-LINE 1 false 1731453984028 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. /tmp/OPVisit11164409938775848002.xml (Tic-Visit :proposal-id 17607 :visit-id "01" :proposal-version -1 :trans-version "20240604" :date "12-Nov-2024 16:26:23.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17607 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17607 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2651 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3034 :pcs-gap 0 ) true 1 0