15450( 5) - 25-Oct-2018 19:22:47 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15450 Version: 5 Check-in Time: 25-Oct-2018 19:22:47 STScI Edit Number: 2 Title New Horizons support observations for 2014MU69 encounterWFC3WFCa ------------------------------------------------------------------------------------ Type Cycle GO/DD 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Marc W. Buie Southwest Research Institute Y CoI: Alan Stern Southwest Research Institute N CoI: Dr. John R. Spencer Southwest Research Institute N CoI: Dr. Simon Porter Southwest Research Institute N ------------------------------------------------------------------------------------ Abstract We propose observations in support of the upcoming New Horizons encounter for 2014MU69. One visit is for support observations of a star to be occulted by 2014MU69 on 2018 August 4 from which ultra-precise astrometry and shape information about the target can be derived. The second visit is for a backup epoch of astrometry on 2014MU69 itself at the end of the 2018 observing window at a time when New Horizons will also be observing the target. ------------------------------------------------------------------------------------ Observations Description ------------------------ The two visits in this program are very different. One visit is a routine observation of 2014MU69 for astrometry and uses the same observing methods we have been using since 2014. Five long exposures, full field with WFC3, tracking 2014MU69. This visit needs to be coordinated with the last visit of the multi-cycle proposal started with proposal id 14629. The two visits will need to be scheduled about three days apart in October 2018. These will be the last HST data prior to the New Horizons encounter with 2014MU69. The second visit is of a star that will be occulted by 2014MU69 on 2018 August 4. These observations are primarly intended to check for stellar duplicity that, if found, would provide a crucial update to the occultation prediction. These images also are used to get near-epoch observatoins of the occultation star for an improved position over what we have from the Gaia DR2 catalog. The observations consist of short sub-array exposures with dithering to reconstruct a diffraction limited image and a smaller number of full-field images for astrometry of the target star. ------------------------------------------------------------------------------------ 15450( 5) - 25-Oct-2018 19:22:47 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 MU20180804 STAR, UNDESIGNATED RA=19H04M21.4790S +/- 0.2", J2000 V = 13.38 +/- 0.02 DEC=-20D35'36.55" +/- 0.2" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2018.589 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15450( 5) - 25-Oct-2018 19:22:47 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: 486958-E ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Kuiper-Belt Object ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=44.522607562638, E=0.040269637522, I=2.452265958242, O=158.963182412558, W=174.926199040395, M=315.140003030700, EQUINOX=J2000, EPOCH=15-AUG-2018:00:00:00, EpochTimeScale=UTC ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 27 +/- .3 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 15450( 5) - 25-Oct-2018 19:22:47 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose OTHER Number_Of_Points 5 Point_Spacing .030 Line_Spacing Coordinate_Frame CELESTIAL Pattern_Orient 0 Angle_Between_Sides Center_Pattern YES Pattern_Comments: Objects will naturally dither themselves in a predominantly east-west direction. This dither pattern uses offsets perpendicular to the mean motion of the objects with a two-level pattern so that the dither cannot lead to a false detection with coherent motion. The overall pattern is six positions with 0.75 pixel spacing. ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15450( 5) - 25-Oct-2018 19:22:47 - [ 5] Visit: 13 Visit Requirements: SCHED 90%; BETWEEN 25-OCT-2018:00:00:00 AND 11-NOV-2018:00:00:00 On Hold Comments: Additional Comments: The scheduling for this visit must be coordinated with visit 12 from (14629/15158/?????). These two visits are to be sheduled three days apart within the same one week window. We will need to verify the scheduling window for each visit to ensure there are no field star contamination problems. 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 486958-E WFC3/UVI ACCUM UVIS2 F350LP 1 367.0 S GS ACQ SCENARIO BASE1B3; S (1835 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 | ------------------------------------------------------------------------------------------------------------------------------------ 486958-E 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S 486958-E 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S 486958-E 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S 486958-E 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S 486958-E 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 15450( 5) - 25-Oct-2018 19:22:47 - [ 6] Visit: 15 (MU20180804 OCCULTATION STAR) Visit Requirements: BETWEEN 30-APR-2018:00:00:00 AND 20-MAY-2018:00:00:00 On Hold Comments: Additional Comments: Observations consist of a set of exposures that just avoid saturation on the target star using a 1k sub-array and then a longer exposure set with a spatial scan to get nearby fainter field stars. All observations should be done within a single visiblility window. The scheduling window is based on needing to get advance information for the occultation prediction while being close in time to the occultation. These observations should be done in mid-May, preferably somewhat before visit 09 of HST-GO-15158. 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 MU20180804 WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12, CR-SPLIT=NO 1 15 S (60 PATTERN 2 1 S 1C-SUB S) Comments: Similar observations with HST-GO-14926 used BLADE=A but this was flagged as an error with APT. ------------------------------------------------------------------------------------------------------------------------------------ 2 MU20180804 WFC3/UVI ACCUM UVIS2 F438W CR-SPLIT=NO, FLASH=10 1 430 S (430 POS TARG 0, 0; SPATIAL S S) SCAN 0.0046, 45.0 Degrees, Forward, null, 1 Comments: This is being done as a spatial scan to increase the dynamic range of the images. The rate is chosen to be 1.5 pixels per 16 seconds. 16 seconds is the time for the target star to reach ~80% of saturation. The exposure time is set to put four full-frame exposures in the visibility window with a little bit left over to make sure this will schedule anywhere in the entire scheduling window requested. The angles are all different to mitigate against systematic field star overlap. ------------------------------------------------------------------------------------------------------------------------------------ 3 MU20180804 WFC3/UVI ACCUM UVIS2 F438W CR-SPLIT=NO, FLASH=10 1 430 S (430 POS TARG 0.090, 0.02; S S) SPATIAL SCAN 0.0046, 135.0 Degrees, Forward, null, 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 MU20180804 WFC3/UVI ACCUM UVIS2 F438W CR-SPLIT=NO, FLASH=10 1 430 S (430 POS TARG 0.18, 0.04; S S) SPATIAL SCAN 0.0046, 235.0 Degrees, Forward, null, 1 ------------------------------------------------------------------------------------------------------------------------------------ 15450( 5) - 25-Oct-2018 19:22:47 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 5 MU20180804 WFC3/UVI ACCUM UVIS2 F438W CR-SPLIT=NO, FLASH=10 1 430 S (430 POS TARG 0.270, 0.06; S S) SPATIAL SCAN 0.0046, 325.0 Degrees, Forward, null, 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20180804 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 N/A S K1C-SUB MU20180804 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 N/A S K1C-SUB MU20180804 1 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 N/A S K1C-SUB MU20180804 1 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none none 1 N/A S K1C-SUB MU20180804 2 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 N/A S MU20180804 3 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 N/A S MU20180804 4 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 N/A S MU20180804 5 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 N/A S 15450( 5) - 25-Oct-2018 19:22:47 - [ 8] Summary Form for Proposal 15450 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, FLASH=10, FLASH=12 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 25-OCT-2018:00:00:00 AND 11-NOV-2018:00:00:00, BETWEEN 30-APR-2018:00:00:00 AND 20-MAY-2018:00:00:00, GS ACQ SCENARIO BASE1B3, PATTERN 1 1, PATTERN 2 1, POS TARG 0, 0, POS TARG 0.090, 0.02, POS TARG 0.18, 0.04, POS TARG 0.270, 0.06, SCHED 90%, SEQ 1 NON-INT, SPATIAL SCAN 0.0046, 135.0 Degrees, Forward, null, 1, SPATIAL SCAN 0.0046, 235.0 Degrees, Forward, null, 1, SPATIAL SCAN 0.0046, 325.0 Degrees, Forward, null, 1, SPATIAL SCAN 0.0046, 45.0 Degrees, Forward, null, 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F350LP, F438W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 486958-E, MU20180804 ------------------------------------------------------------------------------------------------------------------------------------