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.

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. SOLAR SYSTEM 12 false 0.0 0.0 false false false false false false SUPPORTED SOLAR SYSTEM Orbital parameters updated 1/20/2010; values obtained from JPL Small-Body Database Browser, http://ssd.jpl.nasa.gov/sbdb.cgi#top 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 F(2650)=1.5E-16 ASTEROID ASTEROID 2005 FY9 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 EARTH COS/NUV Spectroscopic No No G230L COS/NUV Spectroscopic No No G230L COS/NUV Spectroscopic No No G230L COS/NUV Spectroscopic No No G230L COS/NUV Spectroscopic No No G230L COS/NUV Spectroscopic No No G230L Using ephemeris for target 11537-01-KBO-2005-FY9 ephemeris data for target 11537-01-KBO-2005-FY9 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 08.245 to 11.001. ephemeris interval: 09.365 to 12.001 The scheduling data was generated by CASM 18.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 11537 :visit-id "01" :proposal-version -1 :trans-version "20091209" :date "22-Jan-2010 09:36:20.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "32" :si-bright-earth-limb-angle 20.0 :data-volume 313216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11537 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11537 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2901 :al-overhead-at-end 0 :internal-dur-at-end 438 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3234 :pcs-gap 0 ) false 1 0 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 simulated in ETC COS78493. Calculated buffer time: 2/3 of 10500s simulated in ETC COS67291. Calculated buffer time: 2/3 of 10500s simulated in ETC COS67292. Calculated buffer time: 2/3 of 10500s