11827( 3) - 15-Aug-2008 14:45:54 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11827 Version: 3 Check-in Time: 15-Aug-2008 14:45:54 STScI Edit Number: 1 Title Observations of NGC2438 ------------------------------------------------------------------------------------ Type Cycle GO/DD 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Keith S. Noll Space Telescope Science Institute ------------------------------------------------------------------------------------ Abstract The planetary nebula NGC2438 has a series of faint shells surrounding the bright inner portion of the PN. We are testing the feasibility of observing these shells in Ha and OIII. Ground-based images suggest that these shells may have small-scale features that will be resolved with HST. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal takes short and long dithered exposures in H-alpha and OIII to image the faint outer shells of NGC 2438. Shorter exposures in NII and SII will also be taken. The exposures are to test the viability of observing these faint structures as part of the SM4 ERO observations. Extrapolation from ground-based images suggests it might be feasible if there is structure that is unresolved in the ground-based images. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11827( 3) - 15-Aug-2008 14:45:54 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2438 ISM, SHELL, PLANETARY RA=07H41M50.5900S +/- 0.1", J2000 V = 15 +/- 1 NEBULA DEC=-14D44'7.10" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Modified to agree with coordinates published by Brian Skiff, Lowell observatory. Small changes. ------------------------------------------------------------------------------------------------------------------------------------ 11827( 3) - 15-Aug-2008 14:45:54 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 ------------------------------------------------------------------------------------------------------------------------------------ 11827( 3) - 15-Aug-2008 14:45:54 - [ 4] Visit: 01 Visit Requirements: SCHED 70% 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 NGC-2438 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 40 S PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2438 WFPC2 IMAGE PC1 F656N CR-SPLIT=NO 1 1000 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2438 WFPC2 IMAGE PC1 F502N CR-SPLIT=NO 1 40 S PATTERN 1 3-4 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2438 WFPC2 IMAGE PC1 F502N CR-SPLIT=NO 1 1000 S ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-2438 WFPC2 IMAGE PC1 F658N CR-SPLIT=NO 1 500 S PATTERN 1 5-6 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-2438 WFPC2 IMAGE PC1 F673N CR-SPLIT=NO 1 450 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-2438 1 WFPC2 IMAGE PC1 F656N 1 none none none 1 N/A NGC-2438 1 WFPC2 IMAGE PC1 F656N 2 none none none 1 N/A NGC-2438 2 WFPC2 IMAGE PC1 F656N 1 none none none 1 N/A NGC-2438 2 WFPC2 IMAGE PC1 F656N 2 none none none 1 N/A NGC-2438 3 WFPC2 IMAGE PC1 F502N 1 none none none 2 N/A NGC-2438 3 WFPC2 IMAGE PC1 F502N 2 none none none 2 N/A NGC-2438 4 WFPC2 IMAGE PC1 F502N 1 none none none 2 N/A NGC-2438 4 WFPC2 IMAGE PC1 F502N 2 none none none 2 N/A NGC-2438 5 WFPC2 IMAGE PC1 F658N 1 none none none 3 N/A NGC-2438 5 WFPC2 IMAGE PC1 F658N 2 none none none 3 N/A NGC-2438 6 WFPC2 IMAGE PC1 F673N 1 none none none 3 N/A NGC-2438 6 WFPC2 IMAGE PC1 F673N 2 none none none 3 N/A 11827( 3) - 15-Aug-2008 14:45:54 - [ 5] Summary Form for Proposal 11827 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-2, PATTERN 1 3-4, PATTERN 1 5-6, SCHED 70% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F502N, F656N, F658N, F673N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-2438 ------------------------------------------------------------------------------------------------------------------------------------