12037( 6) - 15-Mar-2011 15:31:22 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12037 Version: 6 Check-in Time: 15-Mar-2011 15:31:22 STScI Edit Number: 1 Title COS-GTO: NUV Spectra of Bright Kuiper Belt Objects Part 2 ------------------------------------------------------------------------------------ Type Cycle GTO/COS 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. James C. Green University of Colorado at Boulder CoI: Dr. Cynthia Froning University of Colorado at Boulder N CoI: Dr. John R. Spencer Southwest Research Institute Y CoI: Dr. S. Alan Stern Southwest Research Institute N 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, Makemake (2005 FY9) and Haumea (2003 EL61), across the NUV band. These particular KBOs are known to have some distinctive characteristics, prominently showing solid methane (Makemake) and water ice (Haumea) absorption in near-IR spectra. Haumea is also unique for its elongated shape; its rapid, 3.9-hour rotation period; and the presence of two moons. ------------------------------------------------------------------------------------ Observations Description ------------------------ Observe KBO Haumea (2006 EL61) for two orbits, obtaining FUV spectra with G230L. Use longest effective wavelength coverage setting (3000?). Single grating will also catch lightcurve variations of this 3.9-hour rotator with a double-peaked lightcurve. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12037( 6) - 15-Mar-2011 15:31:22 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: KBO-HAUMEA ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: ASTEROID ASTEROID Haumea (2003 EL61) ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=ASTEROID, A=42.99507207306954, E=.1981371235542279, I=28.21833301116119, O=122.0522652259027, W=239.880877705018, M=203.9675600150349, EQUINOX=J2000, EPOCH=23-JUL-2010:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 17.4 +/- 0.5 orbital parameters from JPL Small-Body Database on F(2650)=9.0E-17 2011/3/08 (Solution date 2011-Feb-22) Ephemeris Center: EARTH Formal errors in sky coordinates through Cyle 18: <= 0.4" (3 sigma), from JPL Horizons ephemeris generator, http://ssd.jpl.nasa.gov/horizons.cgi ------------------------------------------------------------------------------------------------------------------------------------ 12037( 6) - 15-Mar-2011 15:31:22 - [ 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-HAUMEA COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 190 S GS ACQ SCENARIO BASE1B3 RCH Comments: simulated in ETC COS.A230410, as solar spectrum with effective mV = 17.9, 0.5 magnitudes dimmer in longer NUV wavelengths relative to visible. acquisition S/N = 40 is prohibitive, so imaging is relaxed to achieve S/N = 30. ------------------------------------------------------------------------------------------------------------------------------------ 2 KBO-HAUMEA COS/NUV ACQ/IMA PSA MIRRORA 1 190 S GE ------------------------------------------------------------------------------------------------------------------------------------ 3 KBO-HAUMEA COS/NUV TIME-TA PSA G230L 3000 BUFFER-TIME=950, FP-POS=1 1 950 S G Comments: simulated in ETC, COS.A331124, assuming effective m_V=18.4 point source with solar spectrum (Kurucz G2V) and average airglow. Calculated buffer time: 2/3 of 7400s ------------------------------------------------------------------------------------------------------------------------------------ 4 KBO-HAUMEA COS/NUV TIME-TA PSA G230L 3000 BUFFER-TIME=1335, FP-POS=2 1 1445 S G ------------------------------------------------------------------------------------------------------------------------------------ 5 KBO-HAUMEA COS/NUV TIME-TA PSA G230L 3000 BUFFER-TIME=1445, FP-POS=3 1 1445 S G ------------------------------------------------------------------------------------------------------------------------------------ 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-HAUMEA 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH KBO-HAUMEA 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE KBO-HAUMEA 3 COS/NUV TIME-TA PSA G230L 3000 none none none none 1 N/A G KBO-HAUMEA 4 COS/NUV TIME-TA PSA G230L 3000 none none none none 2 N/A G KBO-HAUMEA 5 COS/NUV TIME-TA PSA G230L 3000 none none none none 2 N/A G 12037( 6) - 15-Mar-2011 15:31:22 - [ 4] Summary Form for Proposal 12037 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1335, BUFFER-TIME=1445, BUFFER-TIME=950, FP-POS=1, FP-POS=2, FP-POS=3, SCAN-SIZE=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names KBO-HAUMEA ------------------------------------------------------------------------------------------------------------------------------------