18425( 2) - 17-Aug-2026 17:27:45 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18425 Version: 2 Check-in Time: 17-Aug-2026 17:27:45 STScI Edit Number: 1 Title Jets, Mergers, and Feedback at Cosmic Dawn: HST-JWST Imaging of z > 4.4 Radio Galaxies ------------------------------------------------------------------------------------ Type Cycle GO 34 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Marco Chiaberge Space Telescope Science Institute - ESA - Y JWST CoI: Dr. Roberto Gilli INAF - Osservatorio di Astrofisica e N Scienza dello Spazio CoI: Dr. Massimo Stiavelli Space Telescope Science Institute N CoI: Dr. Colin A. Norman The Johns Hopkins University N CoI: Dr. George K. Miley Universiteit Leiden N CoI: Dr. Barbara Balmaverde Osservatorio Astronomico di Torino N CoI: Dr. Paolo Tozzi INAF - Osservatorio Astrofisico di Arcetri N ------------------------------------------------------------------------------------ Abstract We propose a joint HST-JWST imaging program targeting the four highest-redshift (z > 4.4) classical radio galaxies known (i.e. the complete accessible population) observed when the Universe was < 1.4 Gyr old. HzRGs pinpoint the most massive galaxies in the early Universe, are associated with protoclusters, and their powerful jets indicate rapidly spinning SMBHs. They provide unique laboratories for studying massive galaxy formation, SMBH growth, and jet-driven feedback at early epochs. Our program addresses four key questions: (1) How do jets drive feedback? HST maps rest-UV continuum and Ly alpha emission relative to the radio structure; JWST provides Balmer-break colors to distinguish jet-induced star formation from the older stellar body. (2) What triggers the jets? JWST rest-frame optical morphologies will reveal whether the merger-jet connection established at z=1-2.5 persists to z > 4.4, or whether coherent accretion dominates SMBH spin-up. (3) What is the AGN geometry? Anomalously high blazar counts at z > 4 suggest near-4pi obscuration; HST narrow-band Ly alpha imaging will test this by constraining ionization cone opening angles. (4) What is the large-scale environment? HST wide-field imaging covers 1 sqMpc, enabling a proto-cluster census. We compare radio-loud targets against matched radio-quiet Type 2 QSOs to isolate the effects of jets on their hosts and test whether mergers preferentially trigger radio-loud activity. This program provides the first rest-frame optical and UV morphologies of z > 4.4 steep-spectrum radio galaxies, constraining how jets, mergers, and feedback shaped the most massive galaxies in the early Universe. ------------------------------------------------------------------------------------ Observations Description ------------------------ Each of the four targets will be observed with two HST broad-band filters (one optical, one near-IR) and one ACS narrow-band ramp filter centered on redshifted Lyalpha (Tabs. 2 and 3, Fig 3 in the proposal). ACS/WFC F775W (1 orbit each) will be obtained for 6C0140+326, RCJ0311+0507, and J1639+4052, sampling rest-frame ~1300-1400 A redward of Lyalpha. For TN J0924-2201 (z = 5.197), deep archival ACS F850LP imaging (5 orbits) provides 18425( 2) - 17-Aug-2026 17:27:45 - [ 2] equivalent coverage. WFC3/IR F140W (1 orbit each) will be obtained for 6C0140+326, RCJ0311+0507, and J1639+4052; TN J0924-2201 requires 2 orbits (F160W) to reach equivalent S/N. Lyalpha will be imaged with ACS ramp filters: FR656N at 6577A (6C0140+326, z = 4.41), FR656N at 6703A (RCJ0311+0507, z = 4.51), FR716N at 7148A (J1639+4052, z = 4.88), and FR782N at 7530A (TN J0924-2201, z = 5.197)", 3 orbit per source. The targets have total Lyalpha fluxes of the order of 10^-17 erg cm^-2 s^-1; the faintest is TN J0924-2201 at 2.1 x 10^-17 erg cm^-2 s^-1 (Venemans et al. 2004), which our 3-orbit ramp images will detect at S/N ~ 8-9 in total. At HST resolution this emission will be resolved into discrete knots and filaments, providing morphological information on the ionization structure unattainable from the ground. ETC simulations with 5x5 pixel rebinning confirm S/N ~ 3 at 8 x 10^-18 erg cm^-2 s^-1 for sources compact on scales <= 0.25" (<= 1.6 kpc at z ~ 4.5), sufficient to detect compact companion Lyalpha emitters comparable to those spectroscopically confirmed in the field of TN J0924-2201 by Venemans et al. (2004). The ETC for the broad-band filters confirm S/N > 5 for K(Vega) = 23.3 mag arcsec^-2 (~2 mag fainter than the targets) and K(Vega) = 24.3 for point sources. ACS observations use a 4-point dither pattern with exposure times set to ensure adequate sky background for pixel-based CTE correction. Post-flash will be used for the ramp filter. ------------------------------------------------------------------------------------ 18425( 2) - 17-Aug-2026 17:27:45 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 6C-0140+326 GALAXY, RADIO GALAXY RA=01H43M43.8528S +/- 0.1", J2000 K=19.9 DEC=+32D53'49.70" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 RC-J0311+050 GALAXY, RADIO GALAXY RA=03H11M48.0044S +/- 0.1", J2000 V = 24.8 K=21.1 7 DEC=+05D08'2.54" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 TN-J0924-220 GALAXY, RADIO GALAXY RA=09H24M19.9200S +/- 0.1", J2000 K=21.7 1 DEC=-22D01'41.48" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 4 NVSS-J163912 GALAXY, RADIO GALAXY RA=16H39M12.1287S, J2000 F775W = 25.8 AB +405237 DEC=+40D52'36.59" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 18425( 2) - 17-Aug-2026 17:27:45 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type SPIRAL Pattern_Purpose DITHER Number_Of_Points 6 Point_Spacing 0.2637 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 20.7 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 18425( 2) - 17-Aug-2026 17:27:45 - [ 5] Visit: 01 (6C-ACS-F775W) 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 6C-0140+326 ACS/WFC ACCUM WFC-FIX F775W 1 490 S PATTERN 4 1 (1960 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 | ------------------------------------------------------------------------------------------------------------------------------------ 6C-0140+326 1 ACS/WFC ACCUM WFC-FIX F775W 1 none none none 1 N/A 6C-0140+326 1 ACS/WFC ACCUM WFC-FIX F775W 2 none none none 1 N/A 6C-0140+326 1 ACS/WFC ACCUM WFC-FIX F775W 3 none none none 1 N/A 6C-0140+326 1 ACS/WFC ACCUM WFC-FIX F775W 4 none none none 1 N/A 18425( 2) - 17-Aug-2026 17:27:45 - [ 6] Visit: 02 (6C-ACS-ramp) 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 6C-0140+326 ACS/WFC ACCUM WFC1-MRAM FR656N 6577 1 1100 S PATTERN 2 1 P (6600 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 | ------------------------------------------------------------------------------------------------------------------------------------ 6C-0140+326 1 ACS/WFC ACCUM WFC1-MRA FR656N 6577 1 none none none 1 N/A MP 6C-0140+326 1 ACS/WFC ACCUM WFC1-MRA FR656N 6577 2 none none none 1 N/A MP 6C-0140+326 1 ACS/WFC ACCUM WFC1-MRA FR656N 6577 3 none none none 2 N/A MP 6C-0140+326 1 ACS/WFC ACCUM WFC1-MRA FR656N 6577 4 none none none 2 N/A MP 6C-0140+326 1 ACS/WFC ACCUM WFC1-MRA FR656N 6577 5 none none none 3 N/A MP 6C-0140+326 1 ACS/WFC ACCUM WFC1-MRA FR656N 6577 6 none none none 3 N/A MP 18425( 2) - 17-Aug-2026 17:27:45 - [ 7] Visit: 03 (6C-WFC3) 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 6C-0140+326 WFC3/IR MULTIAC IR-FIX F140W SAMP-SEQ=STEP100, NSAMP=12 1 DEF PATTERN 3 1 CUM (2396.929 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 | ------------------------------------------------------------------------------------------------------------------------------------ 6C-0140+326 1 WFC3/IR MULTIAC IR-FIX F140W 1 none none none 1 N/A CUM 6C-0140+326 1 WFC3/IR MULTIAC IR-FIX F140W 2 none none none 1 N/A CUM 6C-0140+326 1 WFC3/IR MULTIAC IR-FIX F140W 3 none none none 1 N/A CUM 6C-0140+326 1 WFC3/IR MULTIAC IR-FIX F140W 4 none none none 1 N/A CUM 18425( 2) - 17-Aug-2026 17:27:45 - [ 8] Visit: 04 (RC-ACS-F775W) 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 RC-J0311+05 ACS/WFC ACCUM WFC-FIX F775W 1 490 S PATTERN 4 1 07 (1960 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 | ------------------------------------------------------------------------------------------------------------------------------------ RC-J0311+0507 1 ACS/WFC ACCUM WFC-FIX F775W 1 none none none 1 N/A RC-J0311+0507 1 ACS/WFC ACCUM WFC-FIX F775W 2 none none none 1 N/A RC-J0311+0507 1 ACS/WFC ACCUM WFC-FIX F775W 3 none none none 1 N/A RC-J0311+0507 1 ACS/WFC ACCUM WFC-FIX F775W 4 none none none 1 N/A 18425( 2) - 17-Aug-2026 17:27:45 - [ 9] Visit: 05 (RC-ACS-ramp) 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 RC-J0311+05 ACS/WFC ACCUM WFC1-MRAM FR656N 6703 1 1100 S PATTERN 2 1 07 P (6600 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 | ------------------------------------------------------------------------------------------------------------------------------------ RC-J0311+0507 1 ACS/WFC ACCUM WFC1-MRA FR656N 6703 1 none none none 1 N/A MP RC-J0311+0507 1 ACS/WFC ACCUM WFC1-MRA FR656N 6703 2 none none none 1 N/A MP RC-J0311+0507 1 ACS/WFC ACCUM WFC1-MRA FR656N 6703 3 none none none 2 N/A MP RC-J0311+0507 1 ACS/WFC ACCUM WFC1-MRA FR656N 6703 4 none none none 2 N/A MP RC-J0311+0507 1 ACS/WFC ACCUM WFC1-MRA FR656N 6703 5 none none none 3 N/A MP RC-J0311+0507 1 ACS/WFC ACCUM WFC1-MRA FR656N 6703 6 none none none 3 N/A MP 18425( 2) - 17-Aug-2026 17:27:45 - [ 10] Visit: 06 (RC-WFC3) 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 RC-J0311+05 WFC3/IR MULTIAC IR-FIX F140W SAMP-SEQ=STEP100, NSAMP=12 1 DEF PATTERN 3 1 07 CUM (2396.929 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 | ------------------------------------------------------------------------------------------------------------------------------------ RC-J0311+0507 1 WFC3/IR MULTIAC IR-FIX F140W 1 none none none 1 N/A CUM RC-J0311+0507 1 WFC3/IR MULTIAC IR-FIX F140W 2 none none none 1 N/A CUM RC-J0311+0507 1 WFC3/IR MULTIAC IR-FIX F140W 3 none none none 1 N/A CUM RC-J0311+0507 1 WFC3/IR MULTIAC IR-FIX F140W 4 none none none 1 N/A CUM 18425( 2) - 17-Aug-2026 17:27:45 - [ 11] Visit: 07 (J1639-ACS-F775W) 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 NVSS-J16391 ACS/WFC ACCUM WFC-FIX F775W 1 490 S PATTERN 4 1 2+405237 (1960 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 | ------------------------------------------------------------------------------------------------------------------------------------ NVSS-J163912+405237 1 ACS/WFC ACCUM WFC-FIX F775W 1 none none none 1 N/A NVSS-J163912+405237 1 ACS/WFC ACCUM WFC-FIX F775W 2 none none none 1 N/A NVSS-J163912+405237 1 ACS/WFC ACCUM WFC-FIX F775W 3 none none none 1 N/A NVSS-J163912+405237 1 ACS/WFC ACCUM WFC-FIX F775W 4 none none none 1 N/A 18425( 2) - 17-Aug-2026 17:27:45 - [ 12] Visit: 08 (J1639-ACS-ramp) 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 NVSS-J16391 ACS/WFC ACCUM WFC1-IRAM FR716N 7148 1 1100 S PATTERN 2 1 2+405237 P (6600 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 | ------------------------------------------------------------------------------------------------------------------------------------ NVSS-J163912+405237 1 ACS/WFC ACCUM WFC1-IRA FR716N 7148 1 none none none 1 N/A MP NVSS-J163912+405237 1 ACS/WFC ACCUM WFC1-IRA FR716N 7148 2 none none none 1 N/A MP NVSS-J163912+405237 1 ACS/WFC ACCUM WFC1-IRA FR716N 7148 3 none none none 2 N/A MP NVSS-J163912+405237 1 ACS/WFC ACCUM WFC1-IRA FR716N 7148 4 none none none 2 N/A MP NVSS-J163912+405237 1 ACS/WFC ACCUM WFC1-IRA FR716N 7148 5 none none none 3 N/A MP NVSS-J163912+405237 1 ACS/WFC ACCUM WFC1-IRA FR716N 7148 6 none none none 3 N/A MP 18425( 2) - 17-Aug-2026 17:27:45 - [ 13] Visit: 09 (J1639-WFC3) 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 NVSS-J16391 WFC3/IR MULTIAC IR-FIX F140W SAMP-SEQ=STEP100, NSAMP=12 1 DEF PATTERN 3 1 2+405237 CUM (2396.929 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 | ------------------------------------------------------------------------------------------------------------------------------------ NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F140W 1 none none none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F140W 2 none none none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F140W 3 none none none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F140W 4 none none none 1 N/A CUM 18425( 2) - 17-Aug-2026 17:27:45 - [ 14] Visit: 10 (TN0924-ACS-ramp) 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 TN-J0924-22 ACS/WFC ACCUM WFC2-ORAM FR782N 7530 1 1100 S PATTERN 2 1 01 P (6600 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 | ------------------------------------------------------------------------------------------------------------------------------------ TN-J0924-2201 1 ACS/WFC ACCUM WFC2-ORA FR782N 7530 1 none none none 1 N/A MP TN-J0924-2201 1 ACS/WFC ACCUM WFC2-ORA FR782N 7530 2 none none none 1 N/A MP TN-J0924-2201 1 ACS/WFC ACCUM WFC2-ORA FR782N 7530 3 none none none 2 N/A MP TN-J0924-2201 1 ACS/WFC ACCUM WFC2-ORA FR782N 7530 4 none none none 2 N/A MP TN-J0924-2201 1 ACS/WFC ACCUM WFC2-ORA FR782N 7530 5 none none none 3 N/A MP TN-J0924-2201 1 ACS/WFC ACCUM WFC2-ORA FR782N 7530 6 none none none 3 N/A MP 18425( 2) - 17-Aug-2026 17:27:45 - [ 15] Visit: 11 (TN0924-WFC3) 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 NVSS-J16391 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=STEP100, NSAMP=12 2 DEF PATTERN 3 1 2+405237 CUM (4793.858 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 | ------------------------------------------------------------------------------------------------------------------------------------ NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 1 none 1 none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 1 none 2 none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 2 none 1 none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 2 none 2 none 1 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 3 none 1 none 2 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 3 none 2 none 2 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 4 none 1 none 2 N/A CUM NVSS-J163912+405237 1 WFC3/IR MULTIAC IR-FIX F160W 4 none 2 none 2 N/A CUM 18425( 2) - 17-Aug-2026 17:27:45 - [ 16] Summary Form for Proposal 18425 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFC-FIX, WFC1-IRAMP, WFC1-MRAMP, WFC2-ORAMP ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, SAMP-SEQ=STEP100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 2 1, PATTERN 3 1, PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140W, F160W, F775W, FR656N, FR716N, FR782N ------------------------------------------------------------------------------------------------------------------------------------ Target Names 6C-0140+326, NVSS-J163912+405237, RC-J0311+0507, TN-J0924-2201 ------------------------------------------------------------------------------------------------------------------------------------