17827( 2) - 12-Aug-2024 12:47:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17827 Version: 2 Check-in Time: 12-Aug-2024 12:47:34 STScI Edit Number: 0 Title Weywot's rotational light-curve: searching for hints about the origin of small satellites in the trans-Neptunian region ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dra. Estela Fernandez-Valenzuela University of Central Florida Board of Y Trustees CoI: Dr. Bryan Jason Holler Space Telescope Science Institute N CoI: Dr. Benjamin Proudfoot University of Central Florida Board of N Trustees CoI: Mr. Cameron Philip Collyer University of Central Florida Board of N Trustees CoI: Dr. Juan Luis Rizos Instituto de Astrofisica de Andalucia N (IAA) CoI: Dra. Flavia Luane Rommel University of Central Florida Board of N Trustees ------------------------------------------------------------------------------------ Abstract 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. ------------------------------------------------------------------------------------ Observations Description ------------------------ 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. 17827( 2) - 12-Aug-2024 12:47:34 - [ 2] ------------------------------------------------------------------------------------ 17827( 2) - 12-Aug-2024 12:47:34 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: QUAOAR ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: DWARF-PLANET Quaoar ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=43.20373074161458, E=0.03753824088264753, I=7.995050907129574 , O=189.0123433459229, W=162.2104842103545, M=276.2958152838288, EQUINOX=J2000, EPOCH=06-JUL-2012:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 18.9 Ephemeris Center: EARTH Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 17827( 2) - 12-Aug-2024 12:47:34 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17827( 2) - 12-Aug-2024 12:47:34 - [ 5] Visit: 01 Visit Requirements: BETWEEN 30-JUN-2025:00:00:00 AND 13-JUL-2025:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 6] Visit: 02 Visit Requirements: AFTER 01 BY 1.5 D TO 1.9 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 7] Visit: 03 Visit Requirements: AFTER 02 BY 1.5 D TO 1.9 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 8] Visit: 04 Visit Requirements: AFTER 03 BY 1.5 D TO 1.8 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 9] Visit: 05 Visit Requirements: AFTER 04 BY 1.5 D TO 1.9 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 10] Visit: 06 Visit Requirements: AFTER 05 BY 1.5 D TO 1.9 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 11] Visit: 07 Visit Requirements: AFTER 06 BY 1.5 D TO 1.9 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 QUAOAR WFC3/UVI ACCUM UVIS2-2K2 F606W 1 352 S PATTERN 1 1 S C-SUB (1408 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 1 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 2 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 3 none none none 1 N/A S 2C-SUB QUAOAR 1 WFC3/UVI ACCUM UVIS2-2K F606W 4 none none none 1 N/A S 2C-SUB 17827( 2) - 12-Aug-2024 12:47:34 - [ 12] Summary Form for Proposal 17827 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-2K2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 1.5 D TO 1.9 D, AFTER 02 BY 1.5 D TO 1.9 D, AFTER 03 BY 1.5 D TO 1.8 D, AFTER 04 BY 1.5 D TO 1.9 D, AFTER 05 BY 1.5 D TO 1.9 D, AFTER 06 BY 1.5 D TO 1.9 D, BETWEEN 30-JUN-2025:00:00:00 AND 13-JUL-2025:00:00:00, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names QUAOAR ------------------------------------------------------------------------------------------------------------------------------------