18430( 11) - 26-Aug-2026 12:40:52 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18430 Version: 11 Check-in Time: 26-Aug-2026 12:40:52 STScI Edit Number: 7 Title Planetary Nebulae in Globular Clusters: Are They All Ejected by Binary Stars? ------------------------------------------------------------------------------------ Type Cycle GO 34 ------------------------------------------------------------------------------------ Investigators Contact? PI: Howard Bond Eureka Scientific Inc. Y CoI: Dr. Andrea Bellini Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Stars now evolving in globular clusters (GCs) have initial masses of ~0.8 Msun. Theory predicts that single stars in such ancient populations likely cannot produce planetary nebulae (PNe)--because their post-AGB evolutionary timescales are so long that by the time the star is hot enough to ionise the ejecta, the PN has already dissipated. Nevertheless, there are 3 PNe known in Milky Way GCs. The existence of these PNe likely requires an origin from binary stars, which either merged early in their evolution, or recently underwent a common-envelope (CE) interaction. In the latter case, the central star of the PN would now be a close binary. We propose an acid test of this hypothesis by obtaining photometry of the central star of the PN JaFu 2 in the Milky Way GC NGC 6441. An HST study shows it to have a relatively low mass, strongly suggesting that it has undergone a CE event. In such a binary containing the hot central star and a main-sequence companion, with an orbital period of a few hours to several days, there will be heating effects that produce periodic photometric variations. These would be detectable with high-S/N WFC3 imaging and an optimal scheduling sequence. Thus a stringent test of the prediction that it is a close binary is possible. Failure to demonstrate binarity would call into question theoretical timescales for post-AGB evolution. Success would strengthen the paradigm that binary interactions are a major formation channel for PNe, and the ONLY channel in the old populations of GCs. More broadly, CE interactions are important in a wide variety of astrophysical settings--e.g., SN Ia, CVs, and even LIGO events--so it is crucial to understand them. ------------------------------------------------------------------------------------ Observations Description ------------------------ Photometric monitoring of the nucleus of the planetary nebula JaFu 2 in the Galactic globular cluster NGC 6441. Since its expected variations are due to a heated hemisphere on a cool, close companion of the hot nucleus, the photometric amplitude should be largest at longer wavelengths. The WFC3/UVIS channel I band (F814W) is ideal. A few broad-band observations will be taken at shorter optical wavelengths and in the NUV, to monitor colour variations as well as search for the anticipated two components in the SED of the central star. Exposure times are of order 125 sec; thus several dithered exposures in each filter can be obtained during each HST orbit, by using an appropriate small subarray. 18430( 11) - 26-Aug-2026 12:40:52 - [ 2] Cadence. We will use an optimal spacing of the epochs that samples as many different binary periods as possible in the minimum number of HST orbits. Figure 3 plots the largest orbital phase gap, as a function of assumed binary orbital period, for an observing sequence that covers HST orbits 0, 1, 2, 4, 7, 12, 20, 31, and 47, counting from an arbitrary starting point. Thus our total request is 9 orbits, over an interval of about 3.1 days. ------------------------------------------------------------------------------------ 18430( 11) - 26-Aug-2026 12:40:52 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 JAFU-2 STAR, INTERACTING RA=17H50M10.9280S +/- 0.1", J2000 V = 19.91 +/- 0.02 BINARY, PLANETARY DEC=-37D03'27.52" +/- 0.1" NEBULA CENTRAL STAR, POST-AGB STAR, SDO Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -3.284756905173278E-4 -0.004045 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 18430( 11) - 26-Aug-2026 12:40:52 - [ 4] Visit: 01 Visit Requirements: 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F218W FLASH=40 1 800 S SAME POS AS 1 S C-SUB see below (834 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F555W FLASH=25 1 120 S (120 SAME POS AS 3 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 7 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=40 1 240 S (240 SAME POS AS 6 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 8 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 9 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F390W FLASH=30 1 160 S (160 SAME POS AS 8 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 10 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 11 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 9.51, 12.85 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 12 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 13 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F555W FLASH=40 1 120 S (120 SAME POS AS 12 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 14 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) 18430( 11) - 26-Aug-2026 12:40:52 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 15 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F218W FLASH=40 1 800 S (800 SAME POS AS 14 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 16 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F218W none none none none 1 834.0 S S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F555W none none none none 1 N/A S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 6 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 2 N/A S 2C-SUB JAFU-2 7 WFC3/UVI ACCUM UVIS2-2K F336W none none none none 2 N/A S 2C-SUB JAFU-2 8 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 2 N/A S 2C-SUB JAFU-2 9 WFC3/UVI ACCUM UVIS2-2K F390W none none none none 2 N/A S 2C-SUB JAFU-2 10 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 2 N/A S 2C-SUB JAFU-2 11 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 2 N/A S 2C-SUB JAFU-2 12 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 3 N/A S 2C-SUB JAFU-2 13 WFC3/UVI ACCUM UVIS2-2K F555W none none none none 3 N/A S 2C-SUB JAFU-2 14 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 3 N/A S 2C-SUB JAFU-2 15 WFC3/UVI ACCUM UVIS2-2K F218W none none none none 3 N/A S 2C-SUB JAFU-2 16 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 3 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 6] Visit: 04 Visit Requirements: AFTER 01 BY 3.9 Orbits TO 4.1 Orbits 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F555W FLASH=25 1 120 S SAME POS AS 1 S C-SUB see below (175 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=40 1 240 S SAME POS AS 3 S C-SUB see below (295 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 9.51, 12.85 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F555W none none none none 1 175.0 S S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F336W none none none none 1 295.0 S S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 6 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 7] Visit: 05 Visit Requirements: AFTER 01 BY 6.9 Orbits TO 7.1 Orbits 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F390W FLASH=30 1 160 S (160 SAME POS AS 1 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F275W FLASH=40 1 250 S SAME POS AS 3 S C-SUB see below (287 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 9.51, 12.85 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F390W none none none none 1 N/A S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F275W none none none none 1 287.0 S S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 6 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 8] Visit: 06 Visit Requirements: AFTER 01 BY 11.9 Orbits TO 12.1 Orbits 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F218W FLASH=40 1 800 S SAME POS AS 1 S C-SUB see below (834 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F555W FLASH=25 1 120 S (120 SAME POS AS 3 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F218W none none none none 1 834.0 S S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F555W none none none none 1 N/A S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 9] Visit: 07 Visit Requirements: AFTER 01 BY 19.9 Orbits TO 20.1 Orbits 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=40 1 240 S SAME POS AS 1 S C-SUB see below (263 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F390W FLASH=30 1 160 S SAME POS AS 3 S C-SUB see below (183 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 9.51, 12.85 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F336W none none none none 1 263.0 S S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F390W none none none none 1 183.0 S S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 6 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 10] Visit: 08 Visit Requirements: AFTER 01 BY 30.9 Orbits TO 31.1 Orbits 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F275W FLASH=40 1 250 S (250 SAME POS AS 1 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=30 1 240 S SAME POS AS 3 S C-SUB see below (201 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 9.51, 12.85 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F275W none none none none 1 N/A S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F336W none none none none 1 201.0 S S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 6 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 11] Visit: 09 Visit Requirements: AFTER 01 BY 46.8 Orbits TO 47.2 Orbits 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 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 10.4, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F390W FLASH=30 1 160 S SAME POS AS 1 S C-SUB see below (181 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 14.35, 9.0 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F275W FLASH=25 1 250 S SAME POS AS 3 S C-SUB see below (271 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 12.86, 12.09 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 JAFU-2 WFC3/UVI ACCUM UVIS2-2K2 F814W FLASH=10 1 300 S (300 POS TARG 9.51, 12.85 S C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ JAFU-2 1 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 2 WFC3/UVI ACCUM UVIS2-2K F390W none none none none 1 181.0 S S 2C-SUB JAFU-2 3 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 4 WFC3/UVI ACCUM UVIS2-2K F275W none none none none 1 271.0 S S 2C-SUB JAFU-2 5 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB JAFU-2 6 WFC3/UVI ACCUM UVIS2-2K F814W none none none none 1 N/A S 2C-SUB 18430( 11) - 26-Aug-2026 12:40:52 - [ 12] Summary Form for Proposal 18430 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-2K2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=25, FLASH=30, FLASH=40 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 11.9 Orbits TO 12.1 Orbits, AFTER 01 BY 19.9 Orbits TO 20.1 Orbits, AFTER 01 BY 3.9 Orbits TO 4.1 Orbits, AFTER 01 BY 30.9 Orbits TO 31.1 Orbits, AFTER 01 BY 46.8 Orbits TO 47.2 Orbits, AFTER 01 BY 6.9 Orbits TO 7.1 Orbits, POS TARG 10.4, 9.0, POS TARG 12.86, 12.09, POS TARG 14.35, 9.0, POS TARG 9.51, 12.85, SAME POS AS 1, SAME POS AS 12, SAME POS AS 14, SAME POS AS 3, SAME POS AS 6, SAME POS AS 8 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F218W, F275W, F336W, F390W, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names JAFU-2 ------------------------------------------------------------------------------------------------------------------------------------