14926( 3) - 11-Apr-2017 14:22:58 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14926 Version: 3 Check-in Time: 11-Apr-2017 14:22:58 STScI Edit Number: 0 Title Astrometry of occultation stars for 2014MU69, New Horizons extended mission target ------------------------------------------------------------------------------------ Type Cycle GO/DD 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Marc W. Buie Southwest Research Institute Y CoI: Dr. John R. Spencer Southwest Research Institute Y CoI: Alan Stern Southwest Research Institute N CoI: Dr. J. J. Kavelaars National Research Council of Canada N CoI: Dr. Simon Porter Southwest Research Institute N ------------------------------------------------------------------------------------ Abstract We propose observations of three stars predicted to be occulted by Classical TNO (486958) 2014MU69 in 2017. These imaging observations will be used to improve the determination of the stellar proper motions. Without these observations, the uncertainty in the ground-track prediction is dominated by the uncertainty on the proper motions. With these observations, the prediction will be limited by the uncertainty in the orbit determination for 2014MU69 and good enough to enable observational campaigns. This represents a reduction in the prediction uncertainty by roughly a factor of 4. This improvement makes a ground-based observing campaign and a SOFIA observation possible. These observations contribute to the pre-encounter investigation of the New Horizons extended mission target whose flyby will take place on 2019 Jan 1. ------------------------------------------------------------------------------------ Observations Description ------------------------ Plan A: This visit sequence is for the June 3 and July 10 stars, both at about R=15. The strategy combines short-exposure sub-frame images with full-field longer exposure images. The short exposures are set to expose on the target stars without saturation. Using sub-frames allows getting more images in an orbit. The full-frame images will saturate the target star but will provide much higher SNR data on fainter field stars and allow us to calibrate all stars in the sub-frame to get them onto the Gaia astrometric reference frame. There are eight short exposures, 5 seconds each, with the F350LP filter using a 1K sub-array and a 4-point box dither pattern (repeated twice). There are four long exposures, 90 seconds each, with the F350LP filter, a 4-point box dither and full frame (UVIS1+UVIS2) FOV. The pointing will be set up so that the target star does not move in absolute pixel coordinates between long and short exposures. The long exposure time is not critical and can be adjusted downward to ensure the pattern fits in a single visibility window when scheduled. The signal-to-noise ratio on the short exposures is high enough that we will be dominated by GAIA DR1 catalog errors. The choice of filter in this case is somewhat arbitrary but in using the same filter as for our 2014 MU69 astrometry we will be able to use these new images to improve our PSF modeling on those data. 14926( 3) - 11-Apr-2017 14:22:58 - [ 2] Plan B: This visit sequence is for the July 17 star, at R=12.5. Due to the source brightness, we will use the F475W (g') filter. The basic observing pattern is same as for Plan A but the short exposure time is 1.5 seconds and the long exposure time is 27 seconds. ------------------------------------------------------------------------------------ 14926( 3) - 11-Apr-2017 14:22:58 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 MU20170603 STAR, BULGE RA=19H03M34.4926S, J2000 V = 15.4 +/- 0.1 DEC=-20D34'39.34" Reference Frame: ICRS Comments: g' = 15.15, G5 apparent ------------------------------------------------------------------------------------------------------------------------------------ 2 MU20170710 STAR, BULGE RA=19H00M41.6205S, J2000 V = 15.4 +/- 0.1 DEC=-20D38'44.54" Reference Frame: ICRS Comments: g' = 15.43, G0 apparent ------------------------------------------------------------------------------------------------------------------------------------ 3 MU20170717 STAR, BULGE RA=19H00M8.2926S, J2000 V = 12.5 +/- 0.1 DEC=-20D39'37.96" Reference Frame: ICRS Comments: g' = 12.60, K3 apparent ------------------------------------------------------------------------------------------------------------------------------------ 14926( 3) - 11-Apr-2017 14:22:58 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 14926( 3) - 11-Apr-2017 14:22:58 - [ 5] Visit: 01 (MU20170603 OCCULTATION STAR) Visit Requirements: 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 to get nearby fainter field stars and thus the target will be satuarted on these. All observations should be done within a single visiblility window. Observations need to be scheduled as soon as possible without being a distruptive TOO. The event is on 2017-06-03 so these observations need to schedule in early May to give sufficient time to provide preediction updates needed for deployment of ground-based assets for the occultation. 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 MU20170603 WFC3/UVI ACCUM UVIS2-C1K F350LP FLASH=12, CR-SPLIT=2, BLADE=A 1 10 S (40 PATTERN 2 1 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 MU20170603 WFC3/UVI ACCUM UVIS2-C1K F350LP FLASH=6 1 90 S (360 PATTERN 2 2 S 1C-CTE S) Comments: The intention of this visit is to get more of the fainter field stars around the target star but across a wider field. Ignoring the edither pattern, the target star should be in the same location on the detector as the short exposure set. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 1 none none 1 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 1 none none 2 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 2 none none 1 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 2 none none 2 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 3 none none 1 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 3 none none 2 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 4 none none 1 1 N/A S K1C-SUB MU20170603 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 4 none none 2 1 N/A S K1C-SUB MU20170603 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 1 none none none 1 N/A S K1C-CTE 14926( 3) - 11-Apr-2017 14:22:58 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20170603 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 2 none none none 1 N/A S K1C-CTE MU20170603 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 3 none none none 1 N/A S K1C-CTE MU20170603 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 4 none none none 1 N/A S K1C-CTE 14926( 3) - 11-Apr-2017 14:22:58 - [ 7] Visit: 02 (MU20170710 OCCULTATION STAR) Visit Requirements: 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 to get nearby fainter field stars and thus the target will be satuarted on these. All observations should be done within a single visiblility window. Observations need to be scheduled as soon as possible without being a distruptive TOO. These observations should be done no later than mid-June but earlier is better. 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 MU20170710 WFC3/UVI ACCUM UVIS2-C1K F350LP FLASH=12, CR-SPLIT=2, BLADE=A 1 10 S (40 PATTERN 2 1 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 MU20170710 WFC3/UVI ACCUM UVIS2-C1K F350LP FLASH=6 1 90 S (360 PATTERN 2 2 S 1C-CTE S) Comments: The intention of this visit is to get more of the fainter field stars around the target star but across a wider field. Ignoring the edither pattern, the target star should be in the same location on the detector as the short exposure set. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 1 none none 1 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 1 none none 2 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 2 none none 1 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 2 none none 2 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 3 none none 1 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 3 none none 2 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 4 none none 1 1 N/A S K1C-SUB MU20170710 1 WFC3/UVI ACCUM UVIS2-C1 F350LP 4 none none 2 1 N/A S K1C-SUB MU20170710 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 1 none none none 1 N/A S K1C-CTE 14926( 3) - 11-Apr-2017 14:22:58 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20170710 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 2 none none none 1 N/A S K1C-CTE MU20170710 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 3 none none none 1 N/A S K1C-CTE MU20170710 2 WFC3/UVI ACCUM UVIS2-C1 F350LP 4 none none none 1 N/A S K1C-CTE 14926( 3) - 11-Apr-2017 14:22:58 - [ 9] Visit: 03 (MU20170717 OCCULTATION STAR) Visit Requirements: 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 to get nearby fainter field stars and thus the target will be satuarted on these. All observations should be done within a single visiblility window. Observations need to be scheduled as soon as possible without being a distruptive TOO. These observations should be done no later than mid-June but earlier is better. 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 MU20170717 WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12, CR-SPLIT=2, BLADE=A 1 10 S (40 PATTERN 2 1 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 MU20170717 WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 90 S (360 PATTERN 2 2 S 1C-CTE S) Comments: The intention of this visit is to get more of the fainter field stars around the target star but across a wider field. Ignoring the edither pattern, the target star should be in the same location on the detector as the short exposure set. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none 1 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none 2 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none 1 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none 2 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none 1 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none 2 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none 1 1 N/A S K1C-SUB MU20170717 1 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none 2 1 N/A S K1C-SUB MU20170717 2 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 N/A S K1C-CTE 14926( 3) - 11-Apr-2017 14:22:58 - [ 10] 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 | ------------------------------------------------------------------------------------------------------------------------------------ MU20170717 2 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 N/A S K1C-CTE MU20170717 2 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 N/A S K1C-CTE MU20170717 2 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none none 1 N/A S K1C-CTE 14926( 3) - 11-Apr-2017 14:22:58 - [ 11] Summary Form for Proposal 14926 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-C1K1C-CTE, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BLADE=A, CR-SPLIT=2, FLASH=12, FLASH=6 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 2 1, PATTERN 2 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F350LP, F438W ------------------------------------------------------------------------------------------------------------------------------------ Target Names MU20170603, MU20170710, MU20170717 ------------------------------------------------------------------------------------------------------------------------------------