15447( 6) - 18-Dec-2017 17:44:20 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15447 Version: 6 Check-in Time: 18-Dec-2017 17:44:20 STScI Edit Number: 0 Title Which way home? Finding the origin of our Solar System's first interstellar visitor (Part II)cd ------------------------------------------------------------------------------------ Type Cycle GO/DD 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Karen J. Meech University of Hawaii Y CoI: Dr. Harold A. Weaver The Johns Hopkins University Applied N Physics Laboratory CoI: Dr. Marc W. Buie Southwest Research Institute Y CoI: Marco Micheli ESA SSA-NEO Coordination Centre N CoI: Dr. Jacqueline Keane University of Hawaii N CoI: Dr. Jan Kleyna University of Hawaii N CoI: Olivier Raoul Hainaut European Southern Observatory - Germany N CoI: Dr. Kenneth Chambers University of Hawaii N CoI: Dr. Harald Ebeling University of Hawaii N CoI: Dr. Davide Farnocchia Jet Propulsion Laboratory N CoI: Dr. Richard Wainscoat University of Hawaii N ------------------------------------------------------------------------------------ Abstract We request four additional HST/WFC3/UVIS orbits of 1I/217 U1 ('Oumuamua), our Solar System's first interstellar visitor, in order to complete our DD program 15405. Our science goal is to obtain precise astrometry along an extended arc length in order to identify the region from which this object originated. Since the rotational light curve of 'Oumuamua shows variations of as much as 2.5 mag in brightness, a secure detection in the HST single exposures needed to maximize astrometric precision can only be assured in observations conducted at light curve maximum. However, we and other teams have recently determined that `Oumuamua is in a state of excited rotation and that, contrary to our intial expectations, we cannot predict the rotational phase in early January from existing data. We thus request four additional HST orbits that will allow us to sample `Oumuamua's light curve at multiple rotation phases, thereby ensuring that program 15405 will obtain a secure, final detection of our target that is crucial for this program to achieve its scientific objective. ------------------------------------------------------------------------------------ Observations Description ------------------------ Four different visits to 1I/Oumuamua. All visits are identical: 5 long exposures of the target, with each image taken at a different dither location. ------------------------------------------------------------------------------------ 15447( 6) - 18-Dec-2017 17:44:20 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: OUMUAMUA ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Interstellar Asteroid OUMUAMUA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=0.2558123336343649, E=1.200914723821507, I=122.7325277932375, O=24.59699783461255, W=241.7946554840634, T=09-SEP-2017:12:12:09, TTimeScale=TDB, EQUINOX=J2000, EPOCH=01-JAN-2018:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 27.5 +/- 2.5 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 15447( 6) - 18-Dec-2017 17:44:20 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose OTHER Number_Of_Points 5 Point_Spacing 0.03 Line_Spacing Coordinate_Frame CELESTIAL Pattern_Orient 0 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 15447( 6) - 18-Dec-2017 17:44:20 - [ 4] Visit: 06 (visit 2 of 5) Visit Requirements: BETWEEN 01-JAN-2018:00:00:00 AND 03-JAN-2018:00:00:00 On Hold Comments: Additional Comments: This is the first of 5 visits spaced to catch the maximum of the target's light curve. The first visit of the set (05) is in program 15405. This visit is the first of this set. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OUMUAMUA WFC3/UVI ACCUM UVIS2 F350LP 1 380 S POS TARG 0, -18.0; SEQ 1 S (1900 S) NON-INT; PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 15447( 6) - 18-Dec-2017 17:44:20 - [ 5] Visit: 07 (visit 3 of 5) Visit Requirements: AFTER 06 BY 0 H TO 2 H On Hold Comments: Additional Comments: This is the third of 5 visits spaced to catch the maximum of the target's light curve. The first visit of the set (05) is in program 15405. This is the second visit in this program. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OUMUAMUA WFC3/UVI ACCUM UVIS2 F350LP 1 380 S POS TARG -8.0, 24.0; SEQ S (1900 S) 1 NON-INT; PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 15447( 6) - 18-Dec-2017 17:44:20 - [ 6] Visit: 08 (visit 4 of 5) Visit Requirements: AFTER 07 BY 0 H TO 2 H On Hold Comments: Additional Comments: This is the fourth of 5 visits spaced to catch the maximum of the target's light curve. The first visit of the set (05) is in program 15405. This is the third visit in this program. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OUMUAMUA WFC3/UVI ACCUM UVIS2 F350LP 1 380 S POS TARG -36.0, -2.0; S (1900 S) SEQ 1 NON-INT; PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 15447( 6) - 18-Dec-2017 17:44:20 - [ 7] Visit: 09 (visit 5 of 5) Visit Requirements: AFTER 08 BY 0 H TO 2 H On Hold Comments: Additional Comments: This is the last of 5 visits spaced to catch the maximum of the target's light curve. The first visit of the set (05) is in program 15405. This is the fourth visit in this program. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OUMUAMUA WFC3/UVI ACCUM UVIS2 F350LP 1 380 S POS TARG -8.0, 24.0; SEQ S (1900 S) 1 NON-INT; PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S OUMUAMUA 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 15447( 6) - 18-Dec-2017 17:44:20 - [ 8] Summary Form for Proposal 15447 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 06 BY 0 H TO 2 H, AFTER 07 BY 0 H TO 2 H, AFTER 08 BY 0 H TO 2 H, BETWEEN 01-JAN-2018:00:00:00 AND 03-JAN-2018:00:00:00, PATTERN 1 1, POS TARG -36.0, -2.0, POS TARG -8.0, 24.0, POS TARG 0, -18.0, SEQ 1 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F350LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names OUMUAMUA ------------------------------------------------------------------------------------------------------------------------------------