11971( 11) - 23-Jan-2009 13:40:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11971 Version: 11 Check-in Time: 23-Jan-2009 13:40:43 STScI Edit Number: 9 Title A Rare Mutual Event between Satellites of the Dwarf Planet Haumea ------------------------------------------------------------------------------------ Type Cycle GO/DD 16 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Darin Ragozzine California Institute of Technology CoI: Dr. Michael E. Brown California Institute of Technology N ------------------------------------------------------------------------------------ Abstract The dwarf planet Haumea has a fascinating history, including the formation of two large satellites by an ancient mantle-shattering collision. Haumea also has an exciting future with many observable mutual events between Haumea and the smaller inner moon Namaka predicted for the next several years. The Haumea-Namaka mutual events will provide a wealth of information that is otherwise unattainable: the size, shape, and spin pole of Haumea; the size, albedo, and density of Namaka; and precise orbital constraints. The orbital orientation is not as favorable for the outer, larger satellite Hi'iaka, but the last two possible mutual events between Hi'iaka and Namaka occur in 2009 and will not occur again for decades. We propose a short (5-orbit) WFPC2 resolved photometry program to observe the first of these events, which will occur with an estimated ~75% probability. Even catching a partial event will measure the density of Hi'iaka to within ~15% and provide unique insight in the formation and evolution of this exciting system. ------------------------------------------------------------------------------------ Observations Description ------------------------ Observations of a satellite-satellite mutual event of the dwarf planet Haumea. The goal is to obtain precise photometry of a (resolved) faint satellite to a moving object. The observations are designed to maximize overall signal-to-noise (by maximizing total exposure time), while taking multiple observations to produce a high-cadence light curve. All 5 orbits must be taken as close as possible to (04-FEB-2009 21:20:00). Five consecutive orbits must be taken, with the first exposure occurring between 04-FEB-2009:16:20:00 and 04-FEB-2009:18:20:00. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- 11971( 11) - 23-Jan-2009 13:40:43 - [ 2] ------------------------------------------------------------------------------------ 11971( 11) - 23-Jan-2009 13:40:43 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: HAUMEA ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID (136108) Dwarf Planet Haumea and its Two Satellites ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=43.1359862, E=0.1949506, I=28.22440, O=122.10320, W=239.18665, M=202.66919, EQUINOX=J2000, EPOCH=30-NOV-2008:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 17.4 +/- 0.0 At the time of the observations, the approximate RA and Dec are 13:43:09.10 +18:53:40.3 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 11971( 11) - 23-Jan-2009 13:40:43 - [ 4] Visit: 01 Visit Requirements: BETWEEN 04-FEB-2009:16:20:00 AND 04-FEB-2009:18:20:00 On Hold Comments: Additional Comments: Observation of the Haumea Satellite-Satellite Mutual Event. The 5 consecutive orbits should be centered as closely as possible to 04-FEB-2009:21:20:00, the best estimate of the event time. The observations are designed to maximize overall signal-to-noise (by maximizing total exposure time), while taking multiple observations to produce a high-cadence light curve. To decrease overhead and maintain photometric stability, we chose not to dither the observations, though the satellites will move between observations and orbits (overall motion of ~1 pixel). Observations should consist of the maximum number of 100-second exposures possible over the course of 5 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HAUMEA WFPC2 IMAGE PC1 F606W 14 100 S POS TARG -7, -8; GS ACQ SCENARIO BASE1T3; SEQ 1 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HAUMEA WFPC2 IMAGE PC1 F606W 14 100 S POS TARG -7, -8; SEQ 2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 3 HAUMEA WFPC2 IMAGE PC1 F606W 14 100 S POS TARG -7, -8; SEQ 3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 HAUMEA WFPC2 IMAGE PC1 F606W 14 100 S POS TARG -7, -8; SEQ 4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 HAUMEA WFPC2 IMAGE PC1 F606W 12 100 S POS TARG -7, -8; SEQ 5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 1 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 2 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 3 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 4 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 5 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 6 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 7 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 8 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 9 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 10 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 11 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 12 none 1 N/A HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 13 none 1 N/A 11971( 11) - 23-Jan-2009 13:40:43 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HAUMEA 1 WFPC2 IMAGE PC1 F606W none none 14 none 1 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 1 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 2 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 3 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 4 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 5 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 6 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 7 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 8 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 9 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 10 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 11 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 12 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 13 none 2 N/A HAUMEA 2 WFPC2 IMAGE PC1 F606W none none 14 none 2 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 1 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 2 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 3 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 4 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 5 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 6 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 7 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 8 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 9 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 10 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 11 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 12 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 13 none 3 N/A HAUMEA 3 WFPC2 IMAGE PC1 F606W none none 14 none 3 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 1 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 2 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 3 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 4 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 5 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 6 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 7 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 8 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 9 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 10 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 11 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 12 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 13 none 4 N/A HAUMEA 4 WFPC2 IMAGE PC1 F606W none none 14 none 4 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 1 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 2 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 3 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 4 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 5 none 5 N/A 11971( 11) - 23-Jan-2009 13:40:43 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 6 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 7 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 8 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 9 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 10 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 11 none 5 N/A HAUMEA 5 WFPC2 IMAGE PC1 F606W none none 12 none 5 N/A 11971( 11) - 23-Jan-2009 13:40:43 - [ 7] Summary Form for Proposal 11971 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 04-FEB-2009:16:20:00 AND 04-FEB-2009:18:20:00, GS ACQ SCENARIO BASE1T3, POS TARG -7, -8, SEQ 1 NON-INT, SEQ 2 NON-INT, SEQ 3 NON-INT, SEQ 4 NON-INT, SEQ 5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HAUMEA ------------------------------------------------------------------------------------------------------------------------------------