0 Assigned ID: 5786 ----- Attempting Submission 1 (Tue Mar 26 22:56:35 GMT 2024) ----- HST Phase I Proposal 5786 successfully submitted. Receipt: # 5786-1 FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser FLASH level may be too low for this exposure or a short subexposure. See extended explanation in the diagnostic browser 0 Your proposal could not be saved. Submission aborted. ----- Attempting Submission 1 (Mon Aug 12 10:08:51 GMT 2024) ----- Weywot's rotational light-curve: searching for hints about the origin of small satellites in the trans-Neptunian region This is a proposal to obtain the rotational light-curve of Weywot, the satellite of the TNO dwarf planet (50000) Quaoar. The study of trans-Neptunian binary and multiple systems provides valuable information about the formation and evolution of the icy bodies found beyond the orbit of Neptune. This, in turn, reveals the dynamical history of the outer solar system and the formation of planetary building blocks. The Quaoar-Weywot system is especially interesting because recent stellar occultation data shows a much larger satellite than expected and a significant difference in albedos between the primary and the secondary. The goal of this proposal is to obtain the rotational light-curve of Weywot. This will allow us to determine Weywot's rotation period and constrain the three-dimensional shape of the object by providing its rotational phase during two predicted stellar occultations by Weywot in July 2025. This is a unique opportunity not presented in the foreseeable future for any other TNO dwarf planet satellite. The combination of these data will provide important constraints for the formation scenario of Weywot and will inform about the formation mechanisms of similar systems. We are using the WFC3 instrument with the UVIS2 detector (full array), and the F606W filter for a total of 7 orbits. These orbits are roughly evenly spaced between 1.5 and 1.9 days. Each orbit in APT uses a 4-point box dither with the WFC3-UVIS-DITHER-BOX pattern and 352 seconds per exposure. This time exceeds the 348-second threshold to avoid overheads from a serial buffer dump. Each orbit is sequence after the previous one within the above indicated time spam. PI Dr. Estela Fernandez-Valenzuela has extensive experience using photometric techniques to construct rotational light-curves and obtain rotation periods of TNOs. She is also an expert in the analysis of stellar occultations and the study of physical properties of TNOs Co-I Dr. Bryan Holler has previous experience using HST to observe TNOs and their satellites (PI of program 15171 to observe the dwarf planet Eris and its satellite, Dysnomia, with WFC3/UVIS; Co-I on snapshot program 15821 to evaluate Centaurs for binarity). He also has prior experience using PSF fitting to analyze WFC3 and ACS images. Co-I Mr. Cameron Collyer is a graduate student under the supervision of PI Fernandez-Valenzuela and Co-I Holler. His PhD thesis is focused on the study of physical properties of TNOs and Centaurs using photometric techniques to obtain their rotational properties, shapes, sizes and albedos. Co-I Collyer is being trained to perform photometry in ground and space-based observations. Co-I Dr. Benjamin Proudfoot is an expert on orbit fitting of TNO binaries. He is responsible for predicting occultations of Weywot. He is the PI of HST program 17417 studying Quaoar and Weywot. Co-I Dr. Juan L. Rizos has been an official member of the Image Processing Working Group of the NASA OSIRIS-REx mission, and is currently a member of the DART mission for analyzing albedo of DRACO camera images. He has extensive expertise in analyzing space mission images. Additionally, he is an early career postdoc at the Instituto the Astrofisica de Andalucia where he is developing techniques to analyze stellar occultations of TNOs and Centaurs. Co-I Dr. Flavia L. Rommel is the lead of the study that characterized a huge topographic feature on the surface of a dwarf planet candidate it the trans-Neptunian region - 2002MS4 - by using the data from the most successful stellar occultation campaign for a TNO registered so far. She is a specialist in predicting, observing, and analyzing stellar occultation events by Centaurs and trans-Neptunian Objects. She is also a member of the team that developed the Stellar Occultation Reduction and Analysis (SORA) Python library. Currently, she is working as a postdoc at the Florida Space Insitute (FSI) - University of Central Florida (UCF), Orlando, USA. The entire team was part of the lead group in charge of the analysis of the stellar occultation produced by Weywot in June 2023. 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