15003( 2) - 28-Jun-2017 18:38:55 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15003 Version: 2 Check-in Time: 28-Jun-2017 18:38:55 STScI Edit Number: 0 Title Stellar Occultation by 2014 MU69 ------------------------------------------------------------------------------------ Type Cycle GO/DD 24 ------------------------------------------------------------------------------------ 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 July 17, 2017 stellar occultation by the Kuiper Belt object 2014 MU69, the close flyby target of the extended New Horizons mission. Our proposed program will constrain the possibility of rings or other debris near 2014 MU69 better than any other available probe of the system. This is a mission support proposal. Only HST can guarantee cloud-free observations of this event with a large aperture telescope. ------------------------------------------------------------------------------------ Observations Description ------------------------ We plan to observe the 2014 MU69 July 17, 2017 stellar occultation star during 2 orbits 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 first 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. The second orbit will only include one exposure, 110 scans with scan length of 0.4 arcsec. This exposure (Exposure #3) will continue monitoring of target photometry. ------------------------------------------------------------------------------------ 15003( 2) - 28-Jun-2017 18:38:55 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR20170717 STAR, K III-I RA=19H00M8.2915S, J2000 V = 12.5 +/- 0.1 G-band mag = 12.602 DEC=-20D39'37.97" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 15003( 2) - 28-Jun-2017 18:38:55 - [ 3] Visit: 01 Visit Requirements: BETWEEN 17-JUL-2017:01:44:00 AND 17-JUL-2017:03:20:00 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 STAR2017071 FGS TRANS 1 F583W SCANS=5 1 250 S (250 SEQ 1-2 NON-INT 7 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 STAR2017071 FGS TRANS 1 F583W SCANS=89 1 890 S (890 7 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 STAR2017071 FGS TRANS 1 F583W SCANS=110 1 1100 S 7 (1100 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 | ------------------------------------------------------------------------------------------------------------------------------------ STAR20170717 1 FGS TRANS 1 F583W none none none none 1 N/A STAR20170717 2 FGS TRANS 1 F583W none none none none 1 N/A STAR20170717 3 FGS TRANS 1 F583W none none none none 2 N/A 15003( 2) - 28-Jun-2017 18:38:55 - [ 4] Summary Form for Proposal 15003 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=110, SCANS=5, SCANS=89 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 17-JUL-2017:01:44:00 AND 17-JUL-2017:03:20:00, SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names STAR20170717 ------------------------------------------------------------------------------------------------------------------------------------