15598( 7) - 09-Jul-2018 19:15:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15598 Version: 7 Check-in Time: 09-Jul-2018 19:15:15 STScI Edit Number: 5 Title Probing the Hill Sphere of 2014 MU69 ------------------------------------------------------------------------------------ Type Cycle GO/DD 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Joshua Kammer Southwest Research Institute Y CoI: Dr. Tracy M Becker Southwest Research Institute N CoI: Dr. Kurt David Retherford Southwest Research Institute N CoI: Dr. S. Alan Stern Southwest Research Institute N CoI: Dr. John R. Spencer Southwest Research Institute N CoI: Dr. Marc W. Buie Southwest Research Institute N CoI: Dr. Catherine Olkin Southwest Research Institute N CoI: Dr. Amanda S. Bosh Massachusetts Institute of Technology N CoI: Dr. Lawrence H. Wasserman Lowell Observatory N ------------------------------------------------------------------------------------ Abstract We propose to observe the August 4, 2018 stellar occultation by the Kuiper Belt object 2014 MU69, the close flyby target of the extended New Horizons mission. HST is the best guaranteed probe of the debris environment near 2014 MU69. The 0.025 second time resolution of the FGS instrument using the F583W filter in TRANS mode will provide sufficient capability to search for rings and other spatially large debris signatures. We propose to execute this program only if HST is in position to probe much closer to 2014 MU69 than observed by our previous program 15003. ------------------------------------------------------------------------------------ Observations Description ------------------------ We plan to observe the 2014 MU69 August 4, 2018 stellar occultation star during 1 orbit using the FGS instrument in TRANS mode with the F583W filter. The start time optimizes the phasing of the observation with the central time of the occultation, ensuring that enough time is available for initial target acquisition and instrument configuration. The orbit will include two exposures: 1) 5 scans with scan length of 2 arcsec, and 2) 89 scans with scan length of 0.4 arcsec. Exposure #1 will be used as a check for stellar binarity. Exposure #2 begins the primary measurement of target photometry. ------------------------------------------------------------------------------------ 15598( 7) - 09-Jul-2018 19:15:15 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR20180804 STAR, UNDESIGNATED RA=19H04M21.4786S, J2000 V = 13.3 +/- 0.1 G-band mag = 13.36 DEC=-20D35'36.55" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 15598( 7) - 09-Jul-2018 19:15:15 - [ 3] Visit: 01 Visit Requirements: BETWEEN 04-AUG-2018:00:24:00 AND 04-AUG-2018:02:24:00 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 STAR2018080 FGS TRANS 1 F583W SCANS=89 1 890 S (890 GS ACQ SCENARIO ONEB1B3; 4 S) SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 STAR2018080 FGS TRANS 1 F583W SCANS=5 1 250 S (250 4 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 | ------------------------------------------------------------------------------------------------------------------------------------ STAR20180804 1 FGS TRANS 1 F583W none none none none 1 N/A STAR20180804 2 FGS TRANS 1 F583W none none none none 1 N/A 15598( 7) - 09-Jul-2018 19:15:15 - [ 4] Summary Form for Proposal 15598 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=5, SCANS=89 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 04-AUG-2018:00:24:00 AND 04-AUG-2018:02:24:00, GS ACQ SCENARIO ONEB1B3, SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names STAR20180804 ------------------------------------------------------------------------------------------------------------------------------------