15492( 4) - 27-Mar-2019 14:50:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15492 Version: 4 Check-in Time: 27-Mar-2019 14:50:23 STScI Edit Number: 0 Title Enabling physical studeis of the Kuiper belt via HST tracking observations of close fly-by targets for the New Horizons spacecraft. ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. J. J. Kavelaars National Research Council of Canada Y CoI: Dr. John R. Spencer Southwest Research Institute N CoI: Dr. Marc W. Buie Southwest Research Institute N CoI: Dr. Simon Porter Southwest Research Institute N CoI: Dr. Alex Harrison Parker Southwest Research Institute N CoI: Dr. Anne J. Verbiscer The University of Virginia N CoI: Dr. S. Alan Stern Southwest Research Institute N ------------------------------------------------------------------------------------ Abstract In winter 2018 / 2019, the New Horizons spacecraft will make close (~0.1 au) fly-bys of two small outer solar system bodies (2014 OS393 and 2014PN70). These two objects are among the three that we discovered during our HST based search for a New Horizons Kuiper belt enconter target (now selected; 2014 MU69). These will be our closest fly-by observations, amoung the nearly dozen TNOs that we will observed from NH. They will appear the brightest as seen from NH, be the best resolved (about 10x higher resolution than HST) and will provide the largest science impact among our flyby targets. We will measure their phase curves, their rotational light curves and search for rings and compangion objects. Although the orbits of these two TNOs are amoung some of the best known they are not yet well enough constrained to enable the science. Due to the closeness of the fly-by we must furthre refine our knowledge of their orbits so as to reduce the uncertainty in the projeted sky-plane when viewed from New Horizons. We are requesting 5 HST orbits to further secure the ephemrides of these objects and enable this high-impact science return from the New Horizons Kuiper Extended Mission. ------------------------------------------------------------------------------------ Observations Description ------------------------ Recovery observation of 2 TNOs that are part of the New Horizons encounter plan. The plan here is to aquire 2 visits on each of 2 TNOs to obtain tracking observations. Each Visit is a single orbit and we pack the maximum number of exposures we can manage into the orbit, for WFC/UVIC this about 440s per exposure. Observations should be trailed at the motion rate of the object to get the maximal SNR. We have special trailed PSF software to compute a small correction to the STScI 15492( 4) - 27-Mar-2019 14:50:23 - [ 2] WCS for the images, which we derive from Gaia. ------------------------------------------------------------------------------------ 15492( 4) - 27-Mar-2019 14:50:23 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: 2013L35U ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: DWARF-PLANET Kuiper belt object ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=43.52215103361905, E=0.08457517513808686, I=3.009397756197836 , O=157.0110378292828, W=11.0002417633085, M=101.7397024037399, EQUINOX=J2000, EPOCH=22-JUL-2013:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 26.5 +/- 0.5 Orbital uncertainty is large Ephemeris Center: EARTH Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 15492( 4) - 27-Mar-2019 14:50:23 - [ 4] Visit: 06 (2013 LU35 Visit) Visit Requirements: PCS MODE FINE; AFTER 26-MAR-2019:00:00:00 On Hold Comments: Additional Comments: Tracking at motion rate of target. 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 2013L35U WFC3/UVI ACCUM UVIS1 F350LP CR-SPLIT=NO 5 400 S S see below (2068 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2013L35U 1 WFC3/UVI ACCUM UVIS1 F350LP none none 1 none 1 413.0 S S 2013L35U 1 WFC3/UVI ACCUM UVIS1 F350LP none none 2 none 1 413.0 S S 2013L35U 1 WFC3/UVI ACCUM UVIS1 F350LP none none 3 none 1 413.0 S S 2013L35U 1 WFC3/UVI ACCUM UVIS1 F350LP none none 4 none 1 413.0 S S 2013L35U 1 WFC3/UVI ACCUM UVIS1 F350LP none none 5 none 1 416.0 S S 15492( 4) - 27-Mar-2019 14:50:23 - [ 5] Summary Form for Proposal 15492 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 26-MAR-2019:00:00:00, PCS MODE FINE ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F350LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2013L35U ------------------------------------------------------------------------------------------------------------------------------------