11807( 2) - 03-Jul-2008 23:28:40 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11807 Version: 2 Check-in Time: 03-Jul-2008 23:28:40 STScI Edit Number: 0 Title Hubble WFPC2 imaging of NGC 2074 in the Large Magellanic Cloud ------------------------------------------------------------------------------------ Type Cycle GO/DD 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Mario Livio Space Telescope Science Institute CoI: Mr. Zolt Levay Space Telescope Science Institute N CoI: Mr. Max Mutchler Space Telescope Science Institute Y CoI: Ms. Lisa Frattare Space Telescope Science Institute N CoI: Ms. Denise Taylor Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We propose HST WFPC2 observations of the diffuse nebula NGC 2074 (which is possibly a SNR) in the LMC. We will exploit the spatial resolution provided by HST to image circumstellar ejecta of hot stars , where ground- based imaging is difficult, and cannot provide meaningful spatial information. The distribution of the ionized gas and dust will allow us to determine the morphology of the circumstellar nebulae. In addition, the image promises to be quite spectacular, endowing it with great outreach potential. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will image this nebula with narrowband emission-line filters [O III], H-alpha, and [S II] (F502N, F656N, and F673N). We also include short V-band (F606W) exposures to get good signal for the stars in the field. A small 3-point line dither pattern will allow us to reject detector artifacts and cosmic rays from the images. The ORIENT was carefully chosen for a particular part of the nebula, so we do not allow much of a range, but it is scheduleable in the desired timeframe. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- We now know that the Hubble Space Telescope will start its 100, 000th orbit on 11-Aug-2008, at 07:42:05 EDT (2008.224:11:42:05 UT). This historic event provides us with a unique outreach opportunity prior to SM4. Since it is impossible to execute and immediately release an image of observations taken precisely on the 100, 000th orbit, and since observations on 11807( 2) - 03-Jul-2008 23:28:40 - [ 2] this single orbit would preclude us from having a 3-color image, we propose a plan that will allow us to celebrate this important milestone. The idea is to take a 3-orbit observation of a particularly attractive target (that has not been previously observed). We plan to take the observation about twelve hours earlier than the 100, 000th orbit (around 19:42 EDT on August 10), and to have the image processed and ready for the TV morning shows. OPO will alert the TV networks that this will be coming. OPO will release the image in the form of a "news nugget", and this will be accompanied by a series of activities that will be designed for the web (e.g. a countdown on HubbleSite), and by a special Kids News piece, by OPO's formal education group. The materials created for this release will also be used in the context of our International Year of Astronomy activities. After an extensive search for an appropriate target, we have chosen NGC 2074 in the LMC, the brightest patch near the superbubble and OB association N158. It shows obvious bright emission with interesting dark columns at a scale that is very appropriate for the size of the WFPC2 field of view. There is every reason to believe that this observation will provide us with a spectacular image. Due to the need for a quick turnaround in processing and preparing these images for a high-profile press release, we request that TDRSS dumps be scheduled as soon as possible after this visit, so that the data will arrive in the archive as soon as possible. ------------------------------------------------------------------------------------ 11807( 2) - 03-Jul-2008 23:28:40 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 28 NGC-2074 ISM, HII REGION, RA=05H39M2.4408S +/- 0.1", J2000 V = 10.0 EMISSION LINE NEBULA DEC=-69D29'38.01" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 11807( 2) - 03-Jul-2008 23:28:40 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFPC2-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.3535 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 45.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11807( 2) - 03-Jul-2008 23:28:40 - [ 5] Visit: 01 Visit Requirements: GYRO MODE 2G; ORIENT 233D TO 237 D 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-2074 WFPC2 IMAGE WF2-FIX F606W CR-SPLIT=NO 1 60 S PATTERN 1 1-4 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2074 WFPC2 IMAGE WF2-FIX F673N CR-SPLIT=NO 1 800 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2074 WFPC2 IMAGE WF2-FIX F502N CR-SPLIT=NO 1 600 S ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2074 WFPC2 IMAGE WF2-FIX F656N CR-SPLIT=NO 1 500 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-2074 1 WFPC2 IMAGE WF2-FIX F606W 1 none none none 1 N/A NGC-2074 1 WFPC2 IMAGE WF2-FIX F606W 2 none none none 2 N/A NGC-2074 1 WFPC2 IMAGE WF2-FIX F606W 3 none none none 3 N/A NGC-2074 2 WFPC2 IMAGE WF2-FIX F673N 1 none none none 1 N/A NGC-2074 2 WFPC2 IMAGE WF2-FIX F673N 2 none none none 2 N/A NGC-2074 2 WFPC2 IMAGE WF2-FIX F673N 3 none none none 3 N/A NGC-2074 3 WFPC2 IMAGE WF2-FIX F502N 1 none none none 1 N/A NGC-2074 3 WFPC2 IMAGE WF2-FIX F502N 2 none none none 2 N/A NGC-2074 3 WFPC2 IMAGE WF2-FIX F502N 3 none none none 3 N/A NGC-2074 4 WFPC2 IMAGE WF2-FIX F656N 1 none none none 1 N/A NGC-2074 4 WFPC2 IMAGE WF2-FIX F656N 2 none none none 2 N/A NGC-2074 4 WFPC2 IMAGE WF2-FIX F656N 3 none none none 3 N/A 11807( 2) - 03-Jul-2008 23:28:40 - [ 6] Summary Form for Proposal 11807 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GYRO MODE 2G, ORIENT 233D TO 237 D, PATTERN 1 1-4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F502N, F606W, F656N, F673N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-2074 ------------------------------------------------------------------------------------------------------------------------------------