11902( 7) - 23-Oct-2008 14:31:11 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11902 Version: 7 Check-in Time: 23-Oct-2008 14:31:11 STScI Edit Number: 3 Title Different responses in interacting galaxies ------------------------------------------------------------------------------------ Type Cycle GO/DD 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Mario Livio Space Telescope Science Institute CoI: Dr. Keith S. Noll Space Telescope Science Institute N CoI: Mr. Max Mutchler Space Telescope Science Institute Y CoI: Ms. Lisa Frattare Space Telescope Science Institute N CoI: Mr. Zolt Levay Space Telescope Science Institute N CoI: Mr. William Januszewski Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We propose WFPC2 observations of the interacting spiral galaxies Arp 273 or Arp 147. Arp 273 is our first choice, and is a fascinating object in its own right, in that the two interacting galaxies exhibit different behaviors due to the interaction. The disk of the larger galaxy is extremely disturbed, but its nucleus shows few signs of activity (it is a LINER). In the smaller (nearly edge-on) galaxy on the other hand, the disk appears to be almost intact, but its nucleus experiences a starburst. The proposed observations are also intended to demonstrate that WFPC2 can produce outstanding science (and images) after the transition to Side B. ------------------------------------------------------------------------------------ Observations Description ------------------------ For Arp 273, we perform a large mosaic shift since the galaxy pair does not fit within one WFPC2 pointing. At each mosaic pointing, we perform a small dither too. For the broadband B, V, I filters we do a 3-step dither which will primarily help to reject cosmic rays and CCD artifacts. For the longer F673N exposures (where we expect to detect redshifted H-alpha emission), a subsampling 4-point dither box pattern is used. The 4 exposures will ensure good cleaning of these long narrowband exposures, and also allow for the resolution of the H-alpha image to be enhanced via drizzling. For Arp 147, we use the subsampling dither box pattern for all filters. There is no good narrowband filter to isolate redshifted H-alpha at the distance of this target. The proposal is split into multiple visits to avoid SAA impacts, but we'd like the visits scheduled as close together as possible, and as soon as possible. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments 11902( 7) - 23-Oct-2008 14:31:11 - [ 2] ------------------- Please use the same guide stars for all visits, and schedule a TDRSS dump as soon as possible following the completion of this program. Visits 01 and 02 were scheduled but never executed due to the unexpected anomalies arising during the side B switch. The repeat visits 51 and 52 are identical, but ON HOLD since Arp 147 now becomes a more feasible target. If the side B switch experiences any further delay, we might revert back to Arp 273, which becomes feasible again on 20 Nov 2008. ------------------------------------------------------------------------------------ 11902( 7) - 23-Oct-2008 14:31:11 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-273 CLUSTER OF GALAXIES, RA=02H21M33.5792S +/- 0.1", J2000 V = 13.7 INTERACTING GALAXY DEC=+39D21'48.01" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 ARP-147 GALAXY, INTERACTING RA=03H11M18.9000S +/- 0.1", J2000 V = 14 +/- 2 B=15.1, E(B-V) = 0.095 GALAXY DEC=+01D18'53.00" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. It is a replacement target, since Arp 273 became infeasible due to the delay in the side B switch. ------------------------------------------------------------------------------------------------------------------------------------ 11902( 7) - 23-Oct-2008 14:31:11 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type LINE LINE Pattern_Purpose MOSAIC DITHER Number_Of_Points 2 3 Point_Spacing 74 0.4 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 0 45 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-BOX LINE Pattern_Purpose DITHER MOSAIC Number_Of_Points 4 2 Point_Spacing 0.559017 74 Line_Spacing 0.559017 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 26.56505 0 Angle_Between_Sides 143.130102 Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.559017 Line_Spacing 0.559017 Coordinate_Frame POS-TARG Pattern_Orient 26.56505 Angle_Between_Sides 143.130102 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.3535 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 45.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11902( 7) - 23-Oct-2008 14:31:11 - [ 5] Visit: 01 Visit Requirements: ORIENT 190D TO 200 D; SEQ 01, 02 WITHIN 1 D On Hold Comments: Additional Comments: Please get the data from these observations to the ground as quickly has possible. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-273 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 500 S PATTERN 2 1-3 ------------------------------------------------------------------------------------------------------------------------------------ 2 ARP-273 WFPC2 IMAGE WF3-FIX F439W CR-SPLIT=NO 1 1000 S ------------------------------------------------------------------------------------------------------------------------------------ 3 ARP-273 WFPC2 IMAGE WF3-FIX F606W CR-SPLIT=NO 1 400 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 1 1 none none 1 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 1 2 none none 2 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 1 3 none none 3 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 2 1 none none 4 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 2 2 none none 5 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 2 3 none none 6 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F439W 1 1 none none 1 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F439W 1 2 none none 2 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F439W 1 3 none none 3 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F439W 2 1 none none 4 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F439W 2 2 none none 5 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F439W 2 3 none none 6 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 1 1 none none 1 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 1 2 none none 2 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 1 3 none none 3 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 2 1 none none 4 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 2 2 none none 5 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 2 3 none none 6 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 6] Visit: 02 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Using the same guide stars for visits 01 and 02 would make assembling the mosaic easier, but is not a requirement. Please get the data from these observations to the ground as quickly has possible. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-273 WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=NO 1 1100 S PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 1 1 none none 1 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 1 2 none none 1 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 2 1 none none 2 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 2 2 none none 2 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 3 1 none none 3 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 3 2 none none 3 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 4 1 none none 4 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 4 2 none none 4 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 7] Visit: 51 Visit Requirements: ORIENT 190D TO 200 D; SEQ 51, 52 WITHIN 1 D; ON HOLD On Hold Comments: This target was our first choice, but it became infeasible due to the delay in the side B switch. We leave it ON HOLD because it becomes feasible again on Nov 20, and we may revert to it if the side B switch is delayed further. Additional Comments: Please get the data from these observations to the ground as quickly has possible. This is a copy 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-273 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 500 S PATTERN 2 1-3 ------------------------------------------------------------------------------------------------------------------------------------ 2 ARP-273 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO 1 1000 S ------------------------------------------------------------------------------------------------------------------------------------ 3 ARP-273 WFPC2 IMAGE WF3-FIX F606W CR-SPLIT=NO 1 400 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 1 1 none none 1 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 1 2 none none 2 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 1 3 none none 3 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 2 1 none none 4 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 2 2 none none 5 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F814W 2 3 none none 6 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F450W 1 1 none none 1 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F450W 1 2 none none 2 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F450W 1 3 none none 3 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F450W 2 1 none none 4 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F450W 2 2 none none 5 N/A ARP-273 2 WFPC2 IMAGE WF3-FIX F450W 2 3 none none 6 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 1 1 none none 1 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 1 2 none none 2 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 1 3 none none 3 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 2 1 none none 4 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 2 2 none none 5 N/A ARP-273 3 WFPC2 IMAGE WF3-FIX F606W 2 3 none none 6 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 8] Visit: 52 Visit Requirements: SAME ORIENT AS 51; ON HOLD On Hold Comments: This target was our first choice, but it became infeasible due to the delay in the side B switch. We leave it ON HOLD because it becomes feasible again on Nov 20, and we may revert to it if the side B switch is delayed further. Additional Comments: Using the same guide stars for visits 51 and 52 would make assembling the mosaic easier, but is not a requirement. Please get the data from these observations to the ground as quickly has possible. This is a copy 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-273 WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=NO 1 1100 S PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 1 1 none none 1 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 1 2 none none 1 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 2 1 none none 2 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 2 2 none none 2 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 3 1 none none 3 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 3 2 none none 3 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 4 1 none none 4 N/A ARP-273 1 WFPC2 IMAGE WF3-FIX F673N 4 2 none none 4 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 9] Visit: 71 Visit Requirements: SEQ 71, 72, 73, 74 WITHIN 7 D On Hold Comments: Additional Comments: All of the Arp 147 exposures have the same POS TARG offset (in addition to the dither pattern) to move this smallish target a bit closer to the WFPC2 apex for better positioning in the overall field-of-view, and also to minimize CTE degradation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-147 WFPC2 IMAGE WF3-FIX F450W CR-SPLIT=NO 2 1100 S POS TARG 10, 10; PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 1 none 1 none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 1 none 2 none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 2 none 1 none 2 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 2 none 2 none 2 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 3 none 1 none 3 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 3 none 2 none 3 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 4 none 1 none 4 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F450W 4 none 2 none 4 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 10] Visit: 72 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-147 WFPC2 IMAGE WF3-FIX F606W CR-SPLIT=NO 1 1100 S POS TARG 10, 10; PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-147 1 WFPC2 IMAGE WF3-FIX F606W 1 none none none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F606W 2 none none none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F606W 3 none none none 2 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F606W 4 none none none 2 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 11] Visit: 73 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-147 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1100 S POS TARG 10, 10; PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-147 1 WFPC2 IMAGE WF3-FIX F814W 1 none none none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F814W 2 none none none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F814W 3 none none none 2 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F814W 4 none none none 2 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 12] Visit: 74 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ARP-147 WFPC2 IMAGE WF3-FIX F606W CR-SPLIT=NO 1 1100 S POS TARG 10, 10; PATTERN 5 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 ARP-147 WFPC2 IMAGE WF3-FIX F814W CR-SPLIT=NO 1 1100 S POS TARG 10, 10 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ARP-147 1 WFPC2 IMAGE WF3-FIX F606W 1 none none none 1 N/A ARP-147 1 WFPC2 IMAGE WF3-FIX F606W 2 none none none 2 N/A ARP-147 2 WFPC2 IMAGE WF3-FIX F814W 1 none none none 1 N/A ARP-147 2 WFPC2 IMAGE WF3-FIX F814W 2 none none none 2 N/A 11902( 7) - 23-Oct-2008 14:31:11 - [ 13] Summary Form for Proposal 11902 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF3-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD , ORIENT 190D TO 200 D, PATTERN 2 1-3, PATTERN 3 1, PATTERN 4 1, PATTERN 5 1-2, POS TARG 10, 10, SAME ORIENT AS 01, SAME ORIENT AS 51, SEQ 01, 02 WITHIN 1 D, SEQ 51, 52 WITHIN 1 D, SEQ 71, 72, 73, 74 WITHIN 7 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F439W, F450W, F606W, F673N, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ARP-147, ARP-273 ------------------------------------------------------------------------------------------------------------------------------------