11537( 7) - 27-Apr-2010 18:09:31 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11537 Version: 7 Check-in Time: 27-Apr-2010 18:09:31 STScI Edit Number: 2 Title COS-GTO: NUV Spectra of Bright Kuiper Belt Objects ------------------------------------------------------------------------------------ Type Cycle GTO/COS 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. James C. Green University of Colorado at Boulder CoI: Dr. Cynthia Froning University of Colorado at Boulder N CoI: Dr. S. Alan Stern Southwest Research Institute N CoI: Dr. John R. Spencer Southwest Research Institute Y CoI: Dr. Nathaniel J. Cunningham University of Nebraska - Lincoln N ------------------------------------------------------------------------------------ Abstract NUV spectra of Kuiper Belt Objects (KBOs) other than Pluto have never yet been obtained. We seek to use COS's sensitivity to determine NUV KBO reflectance slopes and to compare/contrast different KBO spectra by observing two of the brightest, 2005 FY9 and 2003 EL61, across the full NUV band. These particular KBOs are known to have some distinctive characteristics, prominently showing solid methane (2005 FY9) and water ice (2003 EL61) absorption in near-IR spectra. 2003 EL61 is also unique for its elongated shape; its rapid, 3.9-hour rotation period; and the presence of two moons. ------------------------------------------------------------------------------------ Observations Description ------------------------ Observe 2005 FY9 for a single orbit, obtaining FUV spectra with G230L. Use 3 grating tilts (2635, 3000, 3360) to get virtually complete NUV coverage. Short observations preclude use of FP-SPLITs, so a single FP-POS will be used for each grating position. Spectrum will be heavily binned, so high resolution provided by FP-SPLITs is unnecessary. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11537( 7) - 27-Apr-2010 18:09:31 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: KBO-2005-FY9 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID ASTEROID 2005 FY9 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=45.35434373675758, E=0.1632982512538566, I=29.00224714616008, O=79.4885698495363, W=295.2988171604592, M=152.6823011734256, EQUINOX=J2000, EPOCH=04-JAN-2010:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 17 +/- 0.5 Orbital parameters updated 1/20/2010; F(2650)=1.5E-16 values obtained from JPL Small-Body Database Browser, http://ssd.jpl.nasa.gov/sbdb.cgi#top Ephemeris Center: EARTH solution date 2009-Jul-09 18:04:44 based on 777 obs. Formal errors on sky through Cycle 18: < 0.5" (three sigma), from JPL Horizons ephemeris generator, http://ssd.jpl.nasa.gov/horizons.cgi ------------------------------------------------------------------------------------------------------------------------------------ 11537( 7) - 27-Apr-2010 18:09:31 - [ 3] Visit: 01 Visit Requirements: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 KBO-2005-FY COS/NUV ACQ/IMA PSA MIRRORA 1 210 S GS ACQ SCENARIO BASE1B3 9 GE Comments: acquisition time estimate from ETC COS.A218453, assuming solar-type Kurucz spectrum with effective m_V = 18.0 (assuming 1 magnitude dimmer in UV than visible), S/N = 30 imaging ------------------------------------------------------------------------------------------------------------------------------------ 2 KBO-2005-FY COS/NUV TIME-TA PSA G230L 2635 BUFFER-TIME=400 1 512 S 9 G Comments: simulated in ETC COS78493. Calculated buffer time: 2/3 of 10500s ------------------------------------------------------------------------------------------------------------------------------------ 3 KBO-2005-FY COS/NUV TIME-TA PSA G230L 3000 BUFFER-TIME=400 1 512 S 9 G Comments: simulated in ETC COS67291. Calculated buffer time: 2/3 of 10500s ------------------------------------------------------------------------------------------------------------------------------------ 4 KBO-2005-FY COS/NUV TIME-TA PSA G230L 3360 BUFFER-TIME=511 1 511 S 9 G Comments: simulated in ETC COS67292. Calculated buffer time: 2/3 of 10500s ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ KBO-2005-FY9 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE KBO-2005-FY9 2 COS/NUV TIME-TA PSA G230L 2635 none none none none 1 N/A G KBO-2005-FY9 3 COS/NUV TIME-TA PSA G230L 3000 none none none none 1 N/A G KBO-2005-FY9 4 COS/NUV TIME-TA PSA G230L 3360 none none none none 1 N/A G 11537( 7) - 27-Apr-2010 18:09:31 - [ 4] Summary Form for Proposal 11537 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=400, BUFFER-TIME=511 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names KBO-2005-FY9 ------------------------------------------------------------------------------------------------------------------------------------