14040( 4) - 20-Jan-2015 14:32:51 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14040 Version: 4 Check-in Time: 20-Jan-2015 14:32:51 STScI Edit Number: 0 Title Unique Hubble Investigation of a Newly Discovered Main Belt Comet ------------------------------------------------------------------------------------ Type Cycle GO/DD 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. David Jewitt University of California - Los Angeles Y CoI: Dr. Harold A. Weaver The Johns Hopkins University Applied Y Physics Laboratory CoI: Max Mutchler Space Telescope Science Institute Y CoI: Dr. Jessica Agarwal Max Planck Institute for Solar System N Research CoI: Dr. Stephen M. Larson University of Arizona N CoI: Dr. Jing Li University of California - Los Angeles N ------------------------------------------------------------------------------------ Abstract We triggered our Target of Opportunity program (GO-13864: Hubble Imaging of a Newly-Discovered Main-Belt Comet) in October, on the new active asteroid P/2014 S4 (Gibbs). The results are exciting, and are consistent with an asteroid ice-sublimator caught in an early stage of development and showing rapid morphological changes. We request 6 orbits of Hubble DD time (1 orbit every ~3 weeks until the object enters Hubble's solar exclusion zone) to capitalize on this early detection. We will examine the evolution of this body so as to better understand the activity mechanism. P/2014 S4 is particularly interesting because it orbits in a region of the asteroid belt of likely importance for the origin of water on the Earth. ------------------------------------------------------------------------------------ Observations Description ------------------------ We repeat our strategy of obtaining five long F350LP exposures in each epoch (orbit), to maximize S/N and the rejection of artifacts (cosmic rays and star trails). Our visits sample the period leading up to solar avoidance in March 2015. Visit 01 suffered a loss of lock on 1 Dec 2014, so visit 11 is a HOPR repeat of it. Of course we can't recover the intended temporal sampling lost wth visit 01, so at this point it makes sense to schedule visit 11 after solar avoidance in Sep or Oct 2015. ------------------------------------------------------------------------------------ 14040( 4) - 20-Jan-2015 14:32:51 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: 2014S4-GIBBS ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID Main Belt Comet ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=2.39143777546228, E=0.2422061817783991 , I=10.96626376761609, O=106.4940930053456, W=253.5249908690453, T=28-AUG-2014:12:11:14, TTimeScale=TDB, EQUINOX=J2000, EPOCH=19-JUN-2013:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 20 +/- 5 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 14040( 4) - 20-Jan-2015 14:32:51 - [ 3] Visit: 01 Visit Requirements: BETWEEN 16-NOV-2014 AND 08-DEC-2014 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 4] Visit: 02 Visit Requirements: BETWEEN 15-DEC-2014 AND 29-DEC-2014 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 5] Visit: 03 Visit Requirements: BETWEEN 06-JAN-2015:22:00:00 AND 07-JAN-2015:22:00:00 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 6] Visit: 04 Visit Requirements: BETWEEN 21-JAN-2015 AND 04-FEB-2015 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 7] Visit: 05 Visit Requirements: BETWEEN 10-FEB-2015 AND 24-FEB-2015 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 8] Visit: 06 Visit Requirements: BETWEEN 02-MAR-2015 AND 08-MAR-2015 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 9] Visit: 11 Visit Requirements: BETWEEN 31-AUG-2015:00:00:00 AND 27-SEP-2015:00:00:00 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 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 3 410 S S S (1230 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 2014S4-GIBB WFC3/UVI ACCUM UVIS2 F350LP CR-SPLIT=NO 2 410 S (820 POS TARG 0.2, 2.0 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 2014S4-GIBBS 1 WFC3/UVI ACCUM UVIS2 F350LP none none 3 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 1 none 1 N/A S 2014S4-GIBBS 2 WFC3/UVI ACCUM UVIS2 F350LP none none 2 none 1 N/A S 14040( 4) - 20-Jan-2015 14:32:51 - [ 10] Summary Form for Proposal 14040 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 02-MAR-2015 AND 08-MAR-2015, BETWEEN 06-JAN-2015:22:00:00 AND 07-JAN-2015:22:00:00, BETWEEN 10-FEB-2015 AND 24-FEB-2015, BETWEEN 15-DEC-2014 AND 29-DEC-2014, BETWEEN 16-NOV-2014 AND 08-DEC-2014, BETWEEN 21-JAN-2015 AND 04-FEB-2015, BETWEEN 31-AUG-2015:00:00:00 AND 27-SEP-2015:00:00:00, POS TARG 0.2, 2.0 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F350LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2014S4-GIBBS ------------------------------------------------------------------------------------------------------------------------------------