11518( 5) - 30-Apr-2008 13:04:04 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11518 Version: 5 Check-in Time: 30-Apr-2008 13:04:04 STScI Edit Number: 3 Title Mutual eclipses of a Kuiper belt-satellite system ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO/DD 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Michael E. Brown California Institute of Technology CoI: Mr. Darin Ragozzine California Institute of Technology N CoI: Dr. Daniel Fabrycky Harvard University N CoI: Dr. Matthew Holman Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract Ground-based observations two weeks ago strongly suggest that the orbit of the small inner satellite of 2003 EL61, the 5th largest known dwarf planet, is possibly precisely edge-on and thus somewhere in the middle of a ~3 year long cycle of mutual eclipses, occultations, and transits. We anticipate that with another year of ground-based observation we may have sufficient data to accurately predict the times and durations of these events, but by then the events may well be over. If events are indeed occuring, measurement of the timing and depths of such events provides a wealth of precise geometric information for constraining sizes, shapes, orbits, and dynamics of the system. We propose to obtain 5 quick WFPC2 visits to 2003 EL61 over the ~19 day orbital period of the inner satellite to determine a precise orbit and predict mutual event times. We will instantly (within ~1 day of the end of the observations) make these predictions public to allow the maximum number of attempts to collect the data as possible. ------------------------------------------------------------------------------------ Observations Description ------------------------ A simple 2 color 4 image sequence with a dither in the middle of each orbit. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11518( 5) - 30-Apr-2008 13:04:04 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: 2003EL61 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID large Kuiper belt object ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=43.18953285029598 , E=.1935368665567537 , I=28.22278478945061, O=122.090440581686, W=239.0521341253993, M=202.1241278203591, EQUINOX=J2000, EPOCH=14-MAY-2008:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 17.3 +/- .25 #136108 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 11518( 5) - 30-Apr-2008 13:04:04 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 11518( 5) - 30-Apr-2008 13:04:04 - [ 4] Visit: 01 Visit Priority: Visit Requirements: BETWEEN 12-MAY-2008:01:00:00 AND 12-MAY-2008:03:00:00 On Hold Comments: Additional Comments: 2003 EL61, 1st observation This visit should be scheduled as early as possible within the next scheduling period, which starts on May 12th. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2003EL61 WFPC2 IMAGE PC1 F606W 1 400.0 S POS TARG -7.0, -8.0; GS ACQ SCENARIO SINGLE; PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2003EL61 WFPC2 IMAGE PC1 F814W 1 500.0 S POS TARG -7.0, -8.0 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2003EL61 1 WFPC2 IMAGE PC1 F606W 1 none none none 1 N/A 2003EL61 1 WFPC2 IMAGE PC1 F606W 2 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 1 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 2 none none none 1 N/A 11518( 5) - 30-Apr-2008 13:04:04 - [ 5] Visit: 02 Visit Priority: Visit Requirements: BETWEEN 13-MAY-2008:16:00:00 AND 14-MAY-2008:02:00:00 On Hold Comments: Additional Comments: 2003 EL61, 2nd observation Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2003EL61 WFPC2 IMAGE PC1 F606W 1 400.0 S POS TARG -7.0, -8.0; GS ACQ SCENARIO SINGLE; PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2003EL61 WFPC2 IMAGE PC1 F814W 1 500.0 S POS TARG -7.0, -8.0 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2003EL61 1 WFPC2 IMAGE PC1 F606W 1 none none none 1 N/A 2003EL61 1 WFPC2 IMAGE PC1 F606W 2 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 1 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 2 none none none 1 N/A 11518( 5) - 30-Apr-2008 13:04:04 - [ 6] Visit: 03 Visit Priority: Visit Requirements: BETWEEN 15-MAY-2008:11:00:00 AND 15-MAY-2008:21:00:00 On Hold Comments: Additional Comments: 2003 EL61, 3rd observation Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2003EL61 WFPC2 IMAGE PC1 F606W 1 400.0 S POS TARG -7.0, -8.0; GS ACQ SCENARIO SINGLE; PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2003EL61 WFPC2 IMAGE PC1 F814W 1 500.0 S POS TARG -7.0, -8.0 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2003EL61 1 WFPC2 IMAGE PC1 F606W 1 none none none 1 N/A 2003EL61 1 WFPC2 IMAGE PC1 F606W 2 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 1 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 2 none none none 1 N/A 11518( 5) - 30-Apr-2008 13:04:04 - [ 7] Visit: 04 Visit Priority: Visit Requirements: BETWEEN 17-MAY-2008:06:00:00 AND 17-MAY-2008:16:00:00 On Hold Comments: Additional Comments: 2003 EL61, 4th observation Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2003EL61 WFPC2 IMAGE PC1 F606W 1 400.0 S POS TARG -7.0, -8.0; GS ACQ SCENARIO SINGLE; PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2003EL61 WFPC2 IMAGE PC1 F814W 1 500.0 S POS TARG -7.0, -8.0 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2003EL61 1 WFPC2 IMAGE PC1 F606W 1 none none none 1 N/A 2003EL61 1 WFPC2 IMAGE PC1 F606W 2 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 1 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 2 none none none 1 N/A 11518( 5) - 30-Apr-2008 13:04:04 - [ 8] Visit: 05 Visit Priority: Visit Requirements: BETWEEN 19-MAY-2008:06:00:00 AND 19-MAY-2008:07:00:00 On Hold Comments: Additional Comments: 2003 EL61, last observation This visit should be scheduled as late as possible within the 2003 EL61 visibility window. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2003EL61 WFPC2 IMAGE PC1 F606W 1 400.0 S POS TARG -7.0, -8.0; GS ACQ SCENARIO SINGLE; PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2003EL61 WFPC2 IMAGE PC1 F814W 1 500.0 S POS TARG -7.0, -8.0 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2003EL61 1 WFPC2 IMAGE PC1 F606W 1 none none none 1 N/A 2003EL61 1 WFPC2 IMAGE PC1 F606W 2 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 1 none none none 1 N/A 2003EL61 2 WFPC2 IMAGE PC1 F814W 2 none none none 1 N/A 11518( 5) - 30-Apr-2008 13:04:04 - [ 9] Summary Form for Proposal 11518 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 12-MAY-2008:01:00:00 AND 12-MAY-2008:03:00:00, BETWEEN 13-MAY-2008:16:00:00 AND 14-MAY-2008:02:00:00, BETWEEN 15-MAY-2008:11:00:00 AND 15-MAY-2008:21:00:00, BETWEEN 17-MAY-2008:06:00:00 AND 17-MAY-2008:16:00:00, BETWEEN 19-MAY-2008:06:00:00 AND 19-MAY-2008:07:00:00, GS ACQ SCENARIO SINGLE, PATTERN 1 1-2, POS TARG -7.0, -8.0 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2003EL61 ------------------------------------------------------------------------------------------------------------------------------------