15460( 7) - 19-Jun-2018 13:56:58 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15460 Version: 7 Check-in Time: 19-Jun-2018 13:56:58 STScI Edit Number: 2 Title The Orbit of the Newly Discovered Satellite around the Dwarf Planet 2013 FY27 ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Scott Sander Sheppard Carnegie Institution of Washington Y CoI: Prof. Darin Ragozzine Brigham Young University N ------------------------------------------------------------------------------------ Abstract From our HST observations in January we discovered that dwarf planet 2013 FY27 has a satellite that is 2.8 mags fainter and 0.16 arcsecs from the primary. 2013 FY27 is the ninth intrinsically brightest trans-Neptunian object (TNO), and thus likely one of the largest. 2013 FY27 is extra interesting because its size is likely in the transition region of TNO structure. The largest few TNOs all have satellites, which show the largest TNOs have higher densities than the smaller TNOs. There are not many known intermediate sized TNOs like 2013 FY27 with satellites, of which 2013 FY27 is likely the largest and just at the beginning of the transition region from high to low density. This borderline intermediate to large sized TNO will allow us to probe the transition of high density to low density TNOs. 2013 FY27 is by far the largest TNO with a known satellite to not have the satellite's orbit known or soon to be known. We also just observed 2013 FY27 with ALMA, which will give us a size and albedo and thus allow us to obtain the mass and bulk density of 2013 FY27 if we know the satellite's orbit. Calculating the satellite's orbit requires 5 well separated observations. We currently have just the one discovery detection, and thus no motion of the satellite. We request 4 additional orbits with HST now so we can use our recent prior detection with the first few new detections to predict the optimal next time to observe it in April and May, which could save HST time. Also, the next HST GO proposal cycle does not allow small programs, which means our discovery detection will not be useful in predicting optimal HST observing times in the far future. ------------------------------------------------------------------------------------ Observations Description ------------------------ We found a satellite around asteroid 2013 FY27 with HST images in Janauary 2018. We now want to observe this satellite at 4 different epochs in order to get the orbit of the satellite. This object is only up for the next month or so before being lost behind the Sun. 15460( 7) - 19-Jun-2018 13:56:58 - [ 2] We want to observe it ASAP with two different HST orbits scheduled about 2 days apart. We will then use those observations to predict when would be optimal to observe the satellite a third and fourth time, a few weeks later. If dynamic scheduling is not possible, we can schedule all 4 HST orbits now with seperations of about 2 days, 5 days and 12 days. This will not give us optimal coverage, but will likely be okay, but the satellite could be too close and thus confused with the primary if we don't have optimal dynamic scheduling. ------------------------------------------------------------------------------------ 15460( 7) - 19-Jun-2018 13:56:58 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: 2013FY27 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: DWARF-PLANET Asteroid 2013 FY27 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=58.87112529467599, E=0.3906163476853069, I=33.11838655782182, O=187.0531645959515, W=139.6951422033165, M=207.7450731986418, EQUINOX=J2000, EPOCH=25-AUG-2013:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 22.3 +/- 0.1 Need to observe 2013 FY27 with several images to monitor its newly found satellite. Need a few days between HST orbit visits in order to see the satellite move and thus Ephemeris Center: EARTH calculate its orbit. Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 15460( 7) - 19-Jun-2018 13:56:58 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 ------------------------------------------------------------------------------------------------------------------------------------ 15460( 7) - 19-Jun-2018 13:56:58 - [ 5] Visit: 01 (1) Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: First visit of dwarf planet 2013 FY27. To do As Soon As Possible. 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 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F350LP 1 300 S (300 POS TARG 0.0, 0.0 S 1C-CTE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2013FY27 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=SPARS100 1 DEF CUM (602.934 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2013FY27 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=SPARS100 1 DEF CUM (602.934 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F606W 1 310 S (310 POS TARG 0.158, 0.070 S 1C-CTE S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F814W 1 360 S (360 POS TARG 0.099, 0.165 S 1C-CTE 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2013FY27 1 WFC3/UVI ACCUM UVIS2-C1 F350LP none none none none 1 N/A S K1C-CTE 2013FY27 2 WFC3/IR MULTIAC IR F139M none none none none 1 N/A CUM 2013FY27 3 WFC3/IR MULTIAC IR F153M none none none none 1 N/A CUM 2013FY27 4 WFC3/UVI ACCUM UVIS2-C1 F606W none none none none 1 N/A S K1C-CTE 2013FY27 5 WFC3/UVI ACCUM UVIS2-C1 F814W none none none none 1 N/A S K1C-CTE 15460( 7) - 19-Jun-2018 13:56:58 - [ 6] Visit: 02 (2) Visit Requirements: PCS MODE FINE; AFTER 01 BY 1.5 D TO 2.5 D On Hold Comments: Additional Comments: Second visit of dwarf planet 2013 FY27. To do 1.5 to 2.5 days after first visit. 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 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F350LP 1 500 S POS TARG 0.0, 0.0 S 1C-SUB see below (457 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2013FY27 WFC3/UVI ACCUM UVIS2-C51 F350LP 1 200 S (800 POS TARG 0.158, 0.070; S 2C-SUB S) PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 2013FY27 WFC3/UVI ACCUM UVIS2-C51 F350LP 1 200 S (800 POS TARG 0.158, 0.070; S 2C-SUB S) PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2013FY27 1 WFC3/UVI ACCUM UVIS2-C1 F350LP none none none none 1 457.0 S S K1C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 1 none none none 1 N/A S 12C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 2 none none none 1 N/A S 12C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 3 none none none 1 N/A S 12C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 4 none none none 1 N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 1 none none none 1 N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 2 none none none 1 N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 3 none none none 1 N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 4 none none none 1 N/A S 12C-SUB 15460( 7) - 19-Jun-2018 13:56:58 - [ 7] Visit: 03 (3) Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Third visit of dwarf planet 2013 FY27. To do ASAP. 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 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F350LP 1 500 S (500 POS TARG 0.0, 0.0; SEQ S 1C-SUB S) 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 2013FY27 WFC3/UVI ACCUM UVIS2-C51 F350LP 1 200 S (800 POS TARG 0.158, 0.070; S 2C-SUB S) PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 2013FY27 WFC3/UVI ACCUM UVIS2-C51 F350LP 1 200 S (800 POS TARG 0.158, 0.070; S 2C-SUB S) PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2013FY27 1 WFC3/UVI ACCUM UVIS2-C1 F350LP none none none none tbd N/A S K1C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 1 none none none tbd N/A S 12C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 2 none none none tbd N/A S 12C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 3 none none none tbd N/A S 12C-SUB 2013FY27 2 WFC3/UVI ACCUM UVIS2-C5 F350LP 4 none none none tbd N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 1 none none none tbd N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 2 none none none tbd N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 3 none none none tbd N/A S 12C-SUB 2013FY27 3 WFC3/UVI ACCUM UVIS2-C5 F350LP 4 none none none tbd N/A S 12C-SUB 15460( 7) - 19-Jun-2018 13:56:58 - [ 8] Visit: 04 (4) Visit Requirements: PCS MODE FINE; AFTER 03 BY 2.0 D TO 2.5 D On Hold Comments: Additional Comments: Fourth visit of dwarf planet 2013 FY27. To do a few days after Visit 3. 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 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F350LP 1 300 S (300 POS TARG 0.0, 0.0; SEQ S 1C-CTE S) 1-5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 2013FY27 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=SPARS100 1 DEF CUM (602.934 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2013FY27 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=SPARS100 1 DEF CUM (602.934 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F606W 1 310 S (310 POS TARG 0.158, 0.070 S 1C-CTE S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F814W 1 360 S (360 POS TARG 0.099, 0.165 S 1C-CTE 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2013FY27 1 WFC3/UVI ACCUM UVIS2-C1 F350LP none none none none tbd N/A S K1C-CTE 2013FY27 2 WFC3/IR MULTIAC IR F139M none none none none tbd N/A CUM 2013FY27 3 WFC3/IR MULTIAC IR F153M none none none none tbd N/A CUM 2013FY27 4 WFC3/UVI ACCUM UVIS2-C1 F606W none none none none tbd N/A S K1C-CTE 2013FY27 5 WFC3/UVI ACCUM UVIS2-C1 F814W none none none none tbd N/A S K1C-CTE 15460( 7) - 19-Jun-2018 13:56:58 - [ 9] Visit: 51 (5) Visit Requirements: PCS MODE FINE; AFTER 04 BY 3.0 D TO 3.5 D On Hold Comments: Additional Comments: Fifth visit, to do a few days after Visit 4. 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 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F350LP 1 300 S (300 POS TARG 0.0, 0.0; SEQ S 1C-CTE S) 1-5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 2013FY27 WFC3/IR MULTIAC IR F139M NSAMP=7, SAMP-SEQ=SPARS100 1 DEF CUM (602.934 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2013FY27 WFC3/IR MULTIAC IR F153M NSAMP=7, SAMP-SEQ=SPARS100 1 DEF CUM (602.934 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F606W 1 310 S (310 POS TARG 0.158, 0.070 S 1C-CTE S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2013FY27 WFC3/UVI ACCUM UVIS2-C1K F814W 1 360 S (360 POS TARG 0.099, 0.165 S 1C-CTE 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2013FY27 1 WFC3/UVI ACCUM UVIS2-C1 F350LP none none none none tbd N/A S K1C-CTE 2013FY27 2 WFC3/IR MULTIAC IR F139M none none none none tbd N/A CUM 2013FY27 3 WFC3/IR MULTIAC IR F153M none none none none tbd N/A CUM 2013FY27 4 WFC3/UVI ACCUM UVIS2-C1 F606W none none none none tbd N/A S K1C-CTE 2013FY27 5 WFC3/UVI ACCUM UVIS2-C1 F814W none none none none tbd N/A S K1C-CTE 15460( 7) - 19-Jun-2018 13:56:58 - [ 10] Summary Form for Proposal 15460 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2-C1K1C-CTE, UVIS2-C1K1C-SUB, UVIS2-C512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=7, SAMP-SEQ=SPARS100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 1.5 D TO 2.5 D, AFTER 03 BY 2.0 D TO 2.5 D, AFTER 04 BY 3.0 D TO 3.5 D, PATTERN 1 2, PATTERN 1 3, PCS MODE FINE, POS TARG 0.0, 0.0, POS TARG 0.099, 0.165, POS TARG 0.158, 0.070, SEQ 1-3 NON-INT, SEQ 1-5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F139M, F153M, F350LP, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2013FY27 ------------------------------------------------------------------------------------------------------------------------------------