16040( 19) - 04-Mar-2020 15:25:41 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16040 Version: 19 Check-in Time: 04-Mar-2020 15:25:41 STScI Edit Number: 0 Title Constraining the coma volatile content of interstellar comet 2I/Borisov ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Bryce Bolin California Institute of Technology Y CoI: Dr. Dennis Bodewits Auburn University N CoI: Dr. Yanga Fernandez University of Central Florida N CoI: Dr. Carey Michael Lisse The Johns Hopkins University Applied N Physics Laboratory ------------------------------------------------------------------------------------ Abstract We request 6 orbits of observing time to observe the recently discovered interstellar comet 2I/Borisov using WFC3/UVIS. The goal of this program is to better understand the interstellar object population and its member's volatile contents. We will use these observations to characterize 2I's coma-centric color morphology and evolution over three separate observing epochs at varying heliocentric distances during its passage through the Solar System. ------------------------------------------------------------------------------------ Observations Description ------------------------ We request a total of one visit consisting of two orbits to constrain the size and characterize the coma of C/2019 Q4 with WFC3/UVIS. We will acquire images in two medium band and one narrow-band filter (F689M and F845M, and 487N) to image the distribution of dust and ice in the coma. The medium filters are relatively free of gas emission features, and the narrow-band filter 487N is very similar to a comet-specific dust color filter in the International Halley Watch filter set (Farnham et al. 2000). We note that while this filter is designed to observe HBeta filter, the emission of H atoms around comets is diffuse and extended past 10^6 km, well beyond the size physical size of our aperture at the geocentric distance of the comet at the proposed time of observations (~400 km at~3 au for a 0.2'' aperture). The combination of these three filters allows us to use the dust color between 487 -- 845 nm to compare the gas and ice fraction, dust composition, and particle size in the ambient coma. We request coordination of observations with GO Proposal 16041 (PI D. Jewitt) so that our observations are scheduled within ~1-2 days of the GO Proposal 16041 to maximize the usefulness of these datasets. ------------------------------------------------------------------------------------ 16040( 19) - 04-Mar-2020 15:25:41 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: 2IV4 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET 2I_Borisov ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=2.006765531882627, E=3.357515577983859, I=44.04995363419669 , O=308.1494805144747, W=209.1176613137146, T=08-DEC-2019:13:04:53, TTimeScale=TDB, EQUINOX=J2000, EPOCH=15-OCT-2019:00:00:00, EpochTimeScale=TDB, A1=-6.92301940918E-8, A2=5.176229858398E-7, A3=6.539577007294E-8 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 16.5 Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 16040( 19) - 04-Mar-2020 15:25:41 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: 2IV5 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET 2I_Borisov ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=2.006616039924964, E=3.35705587897315, I=44.05351923993201 , O=308.1499849748581, W=209.1244471001688, T=08-DEC-2019:13:18:19, TTimeScale=TDB, EQUINOX=J2000, EPOCH=05-JAN-2020:00:00:00, EpochTimeScale=TDB, A1=-4.515200138092E-8, A2=-3.231415748596E-8, A3=-1.17710609436E-7 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 16.5 Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 16040( 19) - 04-Mar-2020 15:25:41 - [ 4] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: 2IV6 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET 2I_Borisov ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=2.006616039924964, E=3.35705587897315, I=44.05351923993201 , O=308.1499849748581, W=209.1244471001688, T=08-DEC-2019:13:18:19, TTimeScale=TDB, EQUINOX=J2000, EPOCH=05-JAN-2020:00:00:00, EpochTimeScale=TDB, A1=-4.515200138092E-8, A2=-3.231415748596E-8, A3=-1.17710609436E-7 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 16.5 Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 16040( 19) - 04-Mar-2020 15:25:41 - [ 5] Visit: 01 Visit Requirements: ORIENT 292D TO 292 D; BETWEEN 07-DEC-2019:00:00:00 AND 10-DEC-2019:00:00:00 On Hold Comments: Additional Comments: This visit is to occur around the time of perihelion passage between Dec 7 and 10 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 2IV4 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 405 S POS TARG 0.099, 0.106 S see below (404 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2IV4 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 640 S POS TARG 0.099, 0.106 S see below (639 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2IV4 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 640 S POS TARG 0.198, 0.212 S see below (639 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2IV4 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 405 S POS TARG 0.198, 0.212 S see below (404 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2IV4 1 WFC3/UVI ACCUM UVIS2 F689M none none none none 1 404.0 S S 2IV4 2 WFC3/UVI ACCUM UVIS2 F487N none none none none 1 639.0 S S 2IV4 3 WFC3/UVI ACCUM UVIS2 F487N none none none none 1 639.0 S S 2IV4 4 WFC3/UVI ACCUM UVIS2 F845M none none none none 1 404.0 S S 16040( 19) - 04-Mar-2020 15:25:41 - [ 6] Visit: 02 Visit Requirements: SCHED 100%; ORIENT 282.5D TO 290 D; BETWEEN 27-JAN-2020:00:00:00 AND 30-JAN-2020:00:00:00 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 2IV5 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 372 S (372 POS TARG 0.099, 0.106; S S) SEQ 1-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 2IV5 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 520 S (520 POS TARG 0.099, 0.106 S S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2IV5 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 520 S (520 POS TARG 0.198, 0.212 S S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2IV5 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 342 S (342 POS TARG 0.198, 0.212 S S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2IV5 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 375 S (375 POS TARG 0.297, 0.318; S S) NEW OBSET FULL ACQ; SEQ 5-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 6 2IV5 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 500 S (500 POS TARG 0.297, 0.318 S S) ------------------------------------------------------------------------------------------------------------------------------------ 7 2IV5 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 500 S (500 POS TARG 0.396, 0.424 S S) ------------------------------------------------------------------------------------------------------------------------------------ 8 2IV5 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 374 S (374 POS TARG 0.396, 0.424 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2IV5 1 WFC3/UVI ACCUM UVIS2 F689M none none none none 1 N/A S 2IV5 2 WFC3/UVI ACCUM UVIS2 F487N none none none none 1 N/A S 2IV5 3 WFC3/UVI ACCUM UVIS2 F487N none none none none 1 N/A S 2IV5 4 WFC3/UVI ACCUM UVIS2 F845M none none none none 1 N/A S 2IV5 5 WFC3/UVI ACCUM UVIS2 F845M none none none none 2 N/A S 16040( 19) - 04-Mar-2020 15:25:41 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2IV5 6 WFC3/UVI ACCUM UVIS2 F487N none none none none 2 N/A S 2IV5 7 WFC3/UVI ACCUM UVIS2 F487N none none none none 2 N/A S 2IV5 8 WFC3/UVI ACCUM UVIS2 F689M none none none none 2 N/A S 16040( 19) - 04-Mar-2020 15:25:41 - [ 8] Visit: 03 Visit Requirements: BETWEEN 23-MAR-2020:00:00:00 AND 30-MAR-2020:00:00:00 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 2IV6 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 418 S POS TARG 0.099, 0.106; S see below SEQ 1-5 NON-INT (386 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2IV6 WFC3/UVI ACCUM UVIS2 F438W FLASH=8 1 418 S POS TARG 0.099, 0.106 S see below (386 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2IV6 WFC3/UVI ACCUM UVIS2 F438W FLASH=8 1 418 S POS TARG 0.198, 0.212 S see below (386 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2IV6 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 418 S POS TARG 0.198, 0.212 S see below (386 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2IV6 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 418 S POS TARG 0.198, 0.212 S see below (386 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 2IV6 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 418 S POS TARG 0.297, 0.318; S see below SEQ 6-10 NON-INT (411 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 2IV6 WFC3/UVI ACCUM UVIS2 F438W FLASH=8 1 418 S POS TARG 0.297, 0.318 S see below (411 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 2IV6 WFC3/UVI ACCUM UVIS2 F438W FLASH=8 1 418 S POS TARG 0.396, 0.424 S see below (411 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 2IV6 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 418 S POS TARG 0.396, 0.424 S see below (411 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 2IV6 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 418 S POS TARG 0.396, 0.424 S see below (411 S) ------------------------------------------------------------------------------------------------------------------------------------ 16040( 19) - 04-Mar-2020 15:25:41 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2IV6 1 WFC3/UVI ACCUM UVIS2 F689M none none none none 1 386.0 S S 2IV6 2 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 386.0 S S 2IV6 3 WFC3/UVI ACCUM UVIS2 F438W none none none none 1 386.0 S S 2IV6 4 WFC3/UVI ACCUM UVIS2 F689M none none none none 1 386.0 S S 2IV6 5 WFC3/UVI ACCUM UVIS2 F845M none none none none 1 386.0 S S 2IV6 6 WFC3/UVI ACCUM UVIS2 F845M none none none none 2 411.0 S S 2IV6 7 WFC3/UVI ACCUM UVIS2 F438W none none none none 2 411.0 S S 2IV6 8 WFC3/UVI ACCUM UVIS2 F438W none none none none 2 411.0 S S 2IV6 9 WFC3/UVI ACCUM UVIS2 F845M none none none none 2 411.0 S S 2IV6 10 WFC3/UVI ACCUM UVIS2 F689M none none none none 2 411.0 S S 16040( 19) - 04-Mar-2020 15:25:41 - [ 10] Visit: 1A Visit Requirements: BETWEEN 07-DEC-2019:00:00:00 AND 10-DEC-2019:00:00:00; GROUP 1A, 01 WITHIN 5 Orbits On Hold Comments: Additional Comments: This visit is to occur around the time of perihelion passage between Dec 7 and 10 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 2IV4 WFC3/UVI ACCUM UVIS2 F845M FLASH=10 1 405 S POS TARG 0.297, 0.318 S see below (404 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2IV4 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 640 S POS TARG 0.297, 0.318 S see below (639 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2IV4 WFC3/UVI ACCUM UVIS2 F487N FLASH=11 1 640 S POS TARG 0.396, 0.424 S see below (639 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2IV4 WFC3/UVI ACCUM UVIS2 F689M FLASH=9 1 405 S POS TARG 0.396, 0.424 S see below (404 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2IV4 1 WFC3/UVI ACCUM UVIS2 F845M none none none none 1 404.0 S S 2IV4 2 WFC3/UVI ACCUM UVIS2 F487N none none none none 1 639.0 S S 2IV4 3 WFC3/UVI ACCUM UVIS2 F487N none none none none 1 639.0 S S 2IV4 4 WFC3/UVI ACCUM UVIS2 F689M none none none none 1 404.0 S S 16040( 19) - 04-Mar-2020 15:25:41 - [ 11] Summary Form for Proposal 16040 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=11, FLASH=8, FLASH=9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 07-DEC-2019:00:00:00 AND 10-DEC-2019:00:00:00, BETWEEN 23-MAR-2020:00:00:00 AND 30-MAR-2020:00:00:00, BETWEEN 27-JAN-2020:00:00:00 AND 30-JAN-2020:00:00:00, GROUP 1A, 01 WITHIN 5 Orbits, NEW OBSET FULL ACQ, ORIENT 282.5D TO 290 D, ORIENT 292D TO 292 D, POS TARG 0.099, 0.106, POS TARG 0.198, 0.212, POS TARG 0.297, 0.318, POS TARG 0.396, 0.424, SCHED 100%, SEQ 1-4 NON-INT, SEQ 1-5 NON-INT, SEQ 5-8 NON-INT, SEQ 6-10 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F438W, F487N, F689M, F845M ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2IV4, 2IV5, 2IV6 ------------------------------------------------------------------------------------------------------------------------------------