----- Submission 55 (Fri Apr 30 20:13:07 GMT 2004) ----- Recovery of three faint Kuiper Belt Objects discovered with HST We propose 6 orbits to make ACS/WFC follow-up observations of three faint Kuiper Belt Objects (KBOs) that we discovered in the Large Cycle 11 program GO 9433 (G. Bernstein, PI; Bernstein et al. 2004). These KBOs are the faintest -- and therefore smallest -- KBOs known. Two of these objects can be recovered (and the third easily recovered and its colors probed) only with HST. Any future studies of small KBOs will require knowledge of our three faint KBOs. With the proposed observations, the locations of these KBOs will be known quite well until after first light for JWST. Without the proposed observations, these three small KBOs will be effectively lost. This small program represents a small investment of HST time to solidify the legacy of the Bernstein et al. Large GO program. With the proposed observations, we will be able to determine with certainty the dynamical classes of these three KBOs, testing the hypothesis that small KBOs are predominantly classical KBOs. We will also test the suggestion that classical KBOs are uniformly quite red. Lastly, our observations will enable physical studies (e.g., spectroscopy) with JWST a decade from now. All these measurements will provide important evidence for theories on the formation and evolution of the Solar System.
Six orbits in five visits are planned. 2003BF91 is observed in three visits, each of one orbit. The first and second visits are to be separated by one orbit, and the second and third visits are also to be separated by one orbit. 2003BG91 is observed in a single visit comprising one orbit. We observe 2003BG91 in two filters. 2003BH91 is observed in a single visit spanning two (consecutive) orbits. SOLAR SYSTEM 12 false false false false false SUPPORTED SOLAR SYSTEM 2003BF91 is observed in three separate visits. The first and second visit are to be separated by one orbit and the second and third visit are to be separated by one orbit. Valid observations between 23-May-2004 and 6-Jun-2004. OTHER Kuiper Belt Object TYPE=ASTEROID,A=44.302541,E=0.160217,I=1.486203,O=110.214047,W=20.81801,M=65.231716,EQUINOX=J2000,EPOCH=29-MAY-2004:00:01:04 SOLAR SYSTEM 2003BG91 observed in a single visit in two bandpasses. OTHER Kuiper Belt Object TYPE=ASTEROID,A=43.410898,E=0.073243,I=2.458712,O=176.107489,W=45.379552,M=-6.246981,EQUINOX=J2000,EPOCH=29-MAY-2004:00:01:04 SOLAR SYSTEM 2003BH91 observed in a single visit spanning two orbits. Orbits and exposures should be consecutive to the greatest possible extent. OTHER Kuiper Belt Object TYPE=ASTEROID,A=51.974613,E=0.410752,I=1.972663,O=80.143147,W=220.049879,M=-41.417243,EQUINOX=J2000,EPOCH=29-MAY-2004:00:01:04 ACS/WFC Imaging No F606W ACS/WFC Imaging No F555W ACS/WFC Imaging No F814W ACS/WFC Imaging No F606W /data/frodo1/aroman/work/OP-cache/10268-v01.xml First visit for 2003BF91 (Tic-Visit :proposal-id 10268 :visit-id "01" :proposal-version -1 :trans-version "20040225" :date "04-May-2004 15:35:16.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10268 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10268 :visit-id "01" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2731 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) true /data/frodo1/aroman/work/OP-cache/10268-v01.xml /data/frodo1/aroman/work/OP-cache/10268-v02.xml Second visit for 2003BF91 (Tic-Visit :proposal-id 10268 :visit-id "02" :proposal-version -1 :trans-version "20040225" :date "04-May-2004 15:46:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10268 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10268 :visit-id "02" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2731 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) true /data/frodo1/aroman/work/OP-cache/10268-v02.xml /data/frodo1/aroman/work/OP-cache/10268-v03.xml Third visit for 2003BF91 (Tic-Visit :proposal-id 10268 :visit-id "03" :proposal-version -1 :trans-version "20040225" :date "04-May-2004 15:40:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10268 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10268 :visit-id "03" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2731 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) true /data/frodo1/aroman/work/OP-cache/10268-v03.xml A single orbit for 2003BG91 (two filters) (Tic-Visit :proposal-id 10268 :visit-id "04" :proposal-version -1 :trans-version "20040225" :date "30-Apr-2004 14:56:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10268 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10268 :visit-id "04" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2834 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false Schedule either visit 04 or 14. Do not schedule both. Visit 04 is preferred. If visit 04 leads to scheduling difficulties or lower efficiency, use visit 14 instead. /data/frodo1/aroman/work/OP-cache/10268-v05.xml Two orbits for 2003BH91 as a single visit (Tic-Visit :proposal-id 10268 :visit-id "05" :proposal-version -1 :trans-version "20040225" :date "05-May-2004 10:21:25.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2842240 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10268 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10268 :visit-id "05" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2731 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10268 :visit-id "05" :orbit-number 2 :pcs-time 300 :si-vis-utilization 2799 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false /var/tmp/OPVisit55188.xml A single orbit for 2003BG91 (two filters) (Tic-Visit :proposal-id 10268 :visit-id "04" :proposal-version -1 :trans-version "20040225" :date "30-Apr-2004 14:56:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10268 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10268 :visit-id "04" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2834 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false Schedule either visit 04 or 14. Do not schedule both. Visit 04 is preferred. If visit 04 leads to scheduling difficulties or lower efficiency, use visit 14 instead.