14485( 3) - 01-Mar-2016 11:32:50 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14485 Version: 3 Check-in Time: 01-Mar-2016 11:32:50 STScI Edit Number: 0 Title Astrometry of 2014MU69 ------------------------------------------------------------------------------------ Type Cycle GO/DD 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Marc W. Buie Southwest Research Institute Y CoI: Dr. John R. Spencer Southwest Research Institute N CoI: Dr. S. Alan Stern Southwest Research Institute N CoI: Dr. Simon Porter Southwest Research Institute N CoI: Dr. J. J. Kavelaars National Research Council of Canada N CoI: Dr. Harold A. Weaver The Johns Hopkins University Applied N Physics Laboratory CoI: Dr. Alex Parker Southwest Research Institute N CoI: Dr. Anne J. Verbiscer The University of Virginia N CoI: Dr. Amanda M. Zangari Southwest Research Institute N CoI: Dr. Susan D. Benecchi Planetary Science Institute N CoI: Dr. David Tholen University of Hawaii N ------------------------------------------------------------------------------------ Abstract We propose two orbits of time to make high-precision astrometric measurments of the New Horizons extended mission target, 2014MU69. These observations are in direct support of the navigation of New Horizons leading up to its encounter in Jan 2019. These two visits are specifically in support of a trajectory correction maneuver planned for July 2016. This astrometry is a key element leading up to a close investigation of a Cold-Classical Kuiper Belt Object, one of the most primitive members of our solar system. ------------------------------------------------------------------------------------ Observations Description ------------------------ These observations will use the full field of WFC3/UVIS due to its improved broadband PSF and detector sensitivity compared to ACS. This was the HST instrument used to successfully to detect 2014MU69 and our other potential KBO targets in our 2014 search campaign. We are using the F350LP filter for its sensitivity and image quality as well as consistency with the prior observations. Our observing strategy is based on the successful strategy developed for our 2014 and 2015 HST KBO search and followup campaigns. For each HST orbit we will use WFC3 with the F350LP filter to obtain five 370 second exposures. We will track on the known motion of 2014MU69, which results in trailing of stars, but does not prevent their removal to provide robust detections in single orbits as shown. The formal uncertainty of the position on 15 March 2016, based on 2014 and 2015 astrometry, is 15 mas. Thus, the target can easily be placed near the center of WFC3/UVIS2, and very bright stars can be avoided by adjusting the timing of the observations as necessary. Once preliminary observing windows are available we need to examine the background star field for contamination and final scheduling to avoid field stars. We require acquisition of the full WFC3 field for precise astrometric solutions. 14485( 3) - 01-Mar-2016 11:32:50 - [ 2] The first visit needs to schedule in the 7-day window starting on March 15 and the second in a 7-day window startin on May 15. The one week period is chosen to provide ample scheduling flexibility and could be shifted by another day or two if needed. The timing of these weeks is controlled by avoiding the time around quadrature when the sky-plane velocity is below 1 arcsec/hour and the need to get both visit spread out in time and executed in time to support the July trajectory correction maneuver (TCM). The TCM development schedule requires that we complete the second visit by late May. ------------------------------------------------------------------------------------ 14485( 3) - 01-Mar-2016 11:32:50 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: 2014MU69 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Kuiper-Belt Object ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=44.232408255109, E=0.035776003052 , I=2.453085134109 , O=158.938296047929 , W=181.783023901528 , M=305.281257673465 , EQUINOX=J2000, EPOCH=15-MAR-2016:00:00:00, EpochTimeScale=UTC ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 27 +/- .3 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 14485( 3) - 01-Mar-2016 11:32:50 - [ 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. ------------------------------------------------------------------------------------------------------------------------------------ 14485( 3) - 01-Mar-2016 11:32:50 - [ 5] Visit: 01 Visit Requirements: SCHED 100%; BETWEEN 15-MAR-2016:00:00:00 AND 22-MAR-2016:11:00:00 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2014MU69 WFC3/UVI ACCUM UVIS2 F350LP 1 367.0 S SEQ 1 NON-INT; PATTERN 1 S (1835 S) 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 14485( 3) - 01-Mar-2016 11:32:50 - [ 6] Visit: 02 Visit Requirements: SCHED 100%; BETWEEN 15-MAY-2016:00:00:00 AND 22-MAY-2016:11:00:00 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2014MU69 WFC3/UVI ACCUM UVIS2 F350LP 1 367.0 S SEQ 1 NON-INT; PATTERN 1 S (1835 S) 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 1 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 2 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 3 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 4 none none none 1 N/A S 2014MU69 1 WFC3/UVI ACCUM UVIS2 F350LP 5 none none none 1 N/A S 14485( 3) - 01-Mar-2016 11:32:50 - [ 7] Summary Form for Proposal 14485 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 15-MAR-2016:00:00:00 AND 22-MAR-2016:11:00:00, BETWEEN 15-MAY-2016:00:00:00 AND 22-MAY-2016:11:00:00, PATTERN 1 1, SCHED 100%, SEQ 1 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F350LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2014MU69 ------------------------------------------------------------------------------------------------------------------------------------