17598( 5) - 24-Mar-2025 10:50:12 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17598 Version: 5 Check-in Time: 24-Mar-2025 10:50:12 STScI Edit Number: 2 Title The globular clusters of Dragonfly 44 ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Pieter van Dokkum Yale University Y CoI: Prof. Roberto G. Abraham University of Toronto N CoI: Prof. Aaron Romanowsky San Jose State Univ. Research Foundation N CoI: Dr. Shany Danieli Tel Aviv University N ------------------------------------------------------------------------------------ Abstract Ultra diffuse galaxies (UDGs) are large, low surface brightness objects that were first identified in significant numbers in the Coma cluster. One of the most striking aspects of the UDGs in Coma is that they appear to host many globular clusters, up to 7x the number that is expected from their luminosities. The record holder is Dragonfly 44, one of the largest and best-studied UDGs, with 74 clusters found in 3 orbit-depth HST data. The high globular cluster counts have been interpreted as evidence for overly massive dark matter halos, and also as an important clue to understand their formation. However, recently these results have been thrown in doubt, as a re-analysis of the same HST data found only 18 clusters in Dragonfly 44 and similar downward revisions for other UDGs. A special session at a UDG conference this summer indicated that these large differences can be traced to different assumptions and methodologies that are applied to relatively shallow data. Here we propose to obtain a definitive measurement of the globular cluster luminosity function in Dragonfly 44, making use of the superb long pass filters of WFC3/UVIS. A 13-orbit white light UVIS image reaches the equivalent point source depth of a 30-orbit ACS/F606W image, and we show with simulated data that we can securely identify clusters down to ~2 magnitudes below the peak of the luminosity function. This program will resolve an ongoing dispute that is hampering progress in the study of UDGs. It came to the fore in the summer of 2023, after the most recent regular proposal deadline. ------------------------------------------------------------------------------------ Observations Description ------------------------ In visits 1-6 the galaxy will be observed with 4 dithered exposures in 2 orbits per visit. Visit 7 is a single orbit, with 2 exposures. In the reduction all 13 orbits, and 26 exposures, will be combined, so having 1 visit with only 2 exposures should not impact the quality of the reduction. (The alternative was to have 5 visits with 2 orbits and 1 visit with 3 orbits, but that could impact scheduling flexibility.) Visits 1-3 use F200LP, and visits 4-7 use F350LP. The size of the object is 10'', and the dither box size is 25''. This makes it possible to construct and subtract the local background. The sampling of the PSF will be fine, as each of the 7 visits will have a random subpixel offset 17598( 5) - 24-Mar-2025 10:50:12 - [ 2] with respect to the others. No post-flash is needed as the F200LP and F350LP filters provide more than enough counts per exposure. UPDATE for visits 51-55: Visits 1-7 all suffered from the same anomaly, loss of lock after the first exposure. The probability of this failure may have been increased due to the large 25'' dithers between exposures. Therefore, for repeat visits 51-55, the dither pattern was changed to the standard small offsets of WFC3-UVIS-DITHER-BOX. We are only using F350LP in these repeat observations, to ensure that we have a sufficient number of exposures in the same filter, should the anomaly re-occur. (F200LP and F350LP have to be drizzled separately, as they have slightly different sensitivity curves beyond 350 nm). ------------------------------------------------------------------------------------ 17598( 5) - 24-Mar-2025 10:50:12 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 DRAGONFLY-44 GALAXY, DWARF RA=13H00M58.0000S, J2000 V = 25 SPHEROIDAL DEC=+26D58'35.00" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 17598( 5) - 24-Mar-2025 10:50:12 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose BACKGROUND Number_Of_Points 4 Point_Spacing 25 Line_Spacing 25 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose BACKGROUND Number_Of_Points 2 Point_Spacing 35 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 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 ------------------------------------------------------------------------------------------------------------------------------------ 17598( 5) - 24-Mar-2025 10:50:12 - [ 5] 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F200LP 1 1000 S PATTERN 1 1 4 S see below (4994 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 3 none none none 2 1239.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 4 none none none 2 1239.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 6] Visit: 02 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F200LP 1 1000 S PATTERN 1 1 4 S see below (4994 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 3 none none none 2 1239.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 4 none none none 2 1239.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 7] Visit: 03 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F200LP 1 1000 S PATTERN 1 1 4 S see below (4994 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 3 none none none 2 1239.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F200LP 4 none none none 2 1239.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 8] Visit: 04 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 1 1 4 S see below (4994 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1239.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1239.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 9] Visit: 05 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 1 1 4 S see below (4994 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1239.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1239.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 10] Visit: 06 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 1 1 4 S see below (4994 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1239.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1239.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 11] Visit: 07 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 2 1 4 S see below (2516 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 12] Visit: 51 Visit Requirements: On Hold Comments: Additional Comments: HOPR repeat of visit 01. 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 3 1 4 S see below (5012 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1248.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1248.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 13] Visit: 52 Visit Requirements: On Hold Comments: Additional Comments: HOPR repeat of visit 02. 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 3 1 4 S see below (5012 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1248.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1248.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 14] Visit: 53 Visit Requirements: On Hold Comments: Additional Comments: HOPR repeat of visit 03 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 3 1 4 S see below (5012 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1248.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1248.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 15] Visit: 54 Visit Requirements: On Hold Comments: Additional Comments: HOPR repeat of visit 04. 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 3 1 4 S see below (5012 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1248.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1248.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 16] Visit: 55 Visit Requirements: On Hold Comments: Additional Comments: HOPR repeat of visit 05. 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 DRAGONFLY-4 WFC3/UVI ACCUM UVIS2 F350LP 1 1000 S PATTERN 3 1 4 S see below (5012 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 | ------------------------------------------------------------------------------------------------------------------------------------ DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 1258.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 2 1248.0 S S DRAGONFLY-44 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 2 1248.0 S S 17598( 5) - 24-Mar-2025 10:50:12 - [ 17] Summary Form for Proposal 17598 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 1, PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F200LP, F350LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names DRAGONFLY-44 ------------------------------------------------------------------------------------------------------------------------------------