17855( 4) - 11-Dec-2024 21:40:35 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17855 Version: 4 Check-in Time: 11-Dec-2024 21:40:35 STScI Edit Number: 1 Title Narrowband Imaging of NGC 2899 ------------------------------------------------------------------------------------ Type Cycle GO/DD 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Christopher Britt Space Telescope Science Institute Y CoI: Ryan Kunzer Space Telescope Science Institute N CoI: Max Mutchler Space Telescope Science Institute Y CoI: John Maple Space Telescope Science Institute N CoI: Varun Bajaj Space Telescope Science Institute Y CoI: Joseph DePasquale Space Telescope Science Institute Y CoI: Alyssa Pagan Space Telescope Science Institute Y CoI: Christine Pulliam Space Telescope Science Institute N CoI: Ray Villard Space Telescope Science Institute N CoI: Dr. Emma Marcucci Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We propose to take deep narrowband imaging of the planetary nebula NGC 2899. Deep H-alpha, [NII], and [OIII] images in F656N, F658N, and F502N will sample different density and temperature regions within the nebula. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain high signal-to-noise imaging of NGC 2899 in narrowband filters F502N, F656N, and F658N as well as broadband filters F436W, F555W and F814W to highlight the atomic emission lines in the nebula and enable color-balancing the stars, respectively. We propose a single WFC3 pointing which will adequately cover the entire object. We expect to be able to complete observations in a single visit, such that matching position angles in the event of any guide star failures is not a concern. NGC 2899 nearly fills the WFC3 field-of-view and can be observed at any available position angle. We will also employ a dither pattern which fills the chip gaps and enables cosmic ray rejection. The dither pattern will ensure that even the outlying parts of the nebula on the long axis are covered. The nebula has a bright limb in an hourglass shape with a fainter cavity in the middle. We calculate exposure times via the WFC ETC and find that we will acquire high signal-to-noise images suitable for public outreach with a minimum of 800 s in F656N, 300 s in F658N, and 400s of [O III] spread across 3 dithers. However, in order to accommodate buffer dumps, the individual exposures for each dither position must be above 370s, except for bookend exposures. We will place the broadband filters on the bookends since they can be much shallower, and cycling through each narrowband dither position will occupy 1 orbit for each dither, such that we require 3 orbits of HST time for this target. Most of the color in the composite image will derive from the contrasting ionization thresholds and density sensitivities for [O III]. [N II], and H-alpha in the F502, F656N, and F658N filters. The broadband filters are included to get a natural color balance on 17855( 4) - 11-Dec-2024 21:40:35 - [ 2] stars in the image. ------------------------------------------------------------------------------------ 17855( 4) - 11-Dec-2024 21:40:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2899 EXT-STAR, PLANETARY RA=09H27M4.2287S, J2000 V = 12.4 NEBULA CENTRAL STAR DEC=-56D06'20.26" Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17855( 4) - 11-Dec-2024 21:40:35 - [ 4] Visit: 01 Visit Requirements: ORIENT 273D TO 319 D; BEFORE 01-FEB-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 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=15 1 60 S (60 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F502N FLASH=15 1 600 S (600 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F656N FLASH=15 1 900 S (900 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F658N FLASH=18 1 400 S (400 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F438W FLASH=18 1 60 S (60 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F438W FLASH=18 1 60 S (60 POS TARG .932, 2.5 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F502N FLASH=15 1 600 S (600 POS TARG .932, 2.5 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F656N FLASH=15 1 900 S (900 POS TARG .932, 2.5 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F658N FLASH=18 1 400 S (400 POS TARG .932, 2.5 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F555W FLASH=15 1 60 S (60 POS TARG .932, 2.5 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F555W FLASH=15 1 60 S (60 POS TARG .1864, 5.01 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F502N FLASH=15 1 600 S (600 POS TARG .1864, 5.01 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F656N FLASH=15 1 900 S (900 POS TARG .1864, 5.01 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 14 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F658N FLASH=18 1 400 S (400 POS TARG .1864, 5.01 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 17855( 4) - 11-Dec-2024 21:40:35 - [ 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 NGC-2899 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=15 1 60 S (60 POS TARG .1864, 5.01 S ER 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-2899 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-2899 2 WFC3/UVI ACCUM UVIS-CEN F502N none none none none 1 N/A S TER NGC-2899 3 WFC3/UVI ACCUM UVIS-CEN F656N none none none none 1 N/A S TER NGC-2899 4 WFC3/UVI ACCUM UVIS-CEN F658N none none none none 1 N/A S TER NGC-2899 5 WFC3/UVI ACCUM UVIS-CEN F438W none none none none 1 N/A S TER NGC-2899 6 WFC3/UVI ACCUM UVIS-CEN F438W none none none none 2 N/A S TER NGC-2899 7 WFC3/UVI ACCUM UVIS-CEN F502N none none none none 2 N/A S TER NGC-2899 8 WFC3/UVI ACCUM UVIS-CEN F656N none none none none 2 N/A S TER NGC-2899 9 WFC3/UVI ACCUM UVIS-CEN F658N none none none none 2 N/A S TER NGC-2899 10 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 2 N/A S TER NGC-2899 11 WFC3/UVI ACCUM UVIS-CEN F555W none none none none 3 N/A S TER NGC-2899 12 WFC3/UVI ACCUM UVIS-CEN F502N none none none none 3 N/A S TER NGC-2899 13 WFC3/UVI ACCUM UVIS-CEN F656N none none none none 3 N/A S TER NGC-2899 14 WFC3/UVI ACCUM UVIS-CEN F658N none none none none 3 N/A S TER NGC-2899 15 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 3 N/A S TER 17855( 4) - 11-Dec-2024 21:40:35 - [ 6] Summary Form for Proposal 17855 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=15, FLASH=18 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 01-FEB-2025:00:00:00, ORIENT 273D TO 319 D, POS TARG .1864, 5.01, POS TARG .932, 2.5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F438W, F502N, F555W, F656N, F658N, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-2899 ------------------------------------------------------------------------------------------------------------------------------------