As I informed Tony Roman this replaces the submission of earlier today. I added SEP constraints on the ring arc targets to eliminate the unlikely chance that Galatea will fall too close to the arcs. ----- Submission 1 (Fri Nov 19 16:08:42 GMT 2004) ----- ----- Submission 2 (Wed Feb 02 16:10:35 GMT 2005) ----- Phase II Proposal 10398 (Neptune_2004d) successfully submitted. ----- Submission 3 (Wed Feb 02 19:14:49 GMT 2005) ----- The diagnostic says we do not use Target #1, NEPTUNE-ARCS. In fact we do; it defines the orbit of Neptune's ring arcs and is used to specify the OLG constraints on targets 5 (arcs on right) and 7 (arcs on left). Tony Roman is aware of this usage and we have confirmed that it works. APT should probably not be reporting this as a diagnostic. Transcending Voyager: A Deeper Look at Neptune's Ring-Moon System We will use the High Resolution Channel (HRC) of ACS to study the inner rings, arcs and moons of Neptune with a sensitivity that exceeds that achieved by Voyager 2 during its 1989 flyby. Our study will reveal any moons down to V magnitude 25.5, to address a peculiar truncation in the size distribution of inner moons and to look for the "shepherds" and source bodies for Neptune's dusty rings. (For comparison, Neptune's smallest known moon is Naiad, at magnitude 23.9). Recent ground-based studies show that the mysterious arcs in the Adams Ring continue to shift and change, and may be fading away entirely. We will obtain the visual-band data uniquely necessary to determine whether the arcs are fading. Long-term monitoring of the arcs at high resolution and sensitivity will reveal their gradual changes more clearly and enable us to assess the role of Galatea, whose resonances are widely believed to confine the arcs.
Visit 01 will provide the first arc photometry in the visual since Voyager, enabling us to identify any significant long-term trends in brightness or structure. We will also experiment with several filters and exposure times, with and without Neptune behind the occulting mask, to determine how to optimize future observations. Additional visits in mid-December will consist of long exposures to detect the smallest moons and to study the arcs and rings with higher signal-to-noise. In late March-June 2005, after Neptune's solar conjunction, we will study the temporal and photometric properties of the arcs and rings through repeated visits separated by a variety of time scales from 2 to 40 days. For a few images in the first orbit of Visit 01, Neptune is deliberately positioned off the top edge of the HRC field of view. SOLAR SYSTEM 12 false 0.0 false false false false false AVAILABLE SOLAR SYSTEM A model for the orbital motion of Neptune's ring arcs, referring to the leading edge of the Fraternite arc. RING RING NEPTUNE STD=NEPTUNE TYPE=SAT,A=62938.0,EPOCH=18-AUG-1989:12:00:00,N=820.1118,L=257.0,EQUINOX=J2000 SOLAR SYSTEM Planet Neptune with Naiad on the left (east) ansa and Triton's diffraction spikes not crossing the ring region. PLANET RING NEPTUNE STD=NEPTUNE OLG OF NAIAD BETWEEN 48.0 121.0, NOT OLG OF TRITON BETWEEN 0.0 11.0, NOT OLG OF TRITON BETWEEN 169.0 180.0 SOLAR SYSTEM Planet Neptune with Thalassa on the left (east) ansa. Triton's diffraction spikes not crossing the ring region. PLANET RING NEPTUNE STD=NEPTUNE OLG OF THALASSA BETWEEN 50.0 108.0, NOT OLG OF TRITON BETWEEN 0.0 11.0, NOT OLG OF TRITON BETWEEN 169.0 180.0 SOLAR SYSTEM Planet Neptune with arcs on the right (west) ansa and Triton's diffraction spikes not crossing the ring region. Galatea separated from the arcs. PLANET RING NEPTUNE STD=NEPTUNE OLG OF NEPTUNE-ARCS BETWEEN 238.0 298.0, NOT OLG OF TRITON BETWEEN 180.0 191.0, NOT OLG OF TRITON BETWEEN 349.0 360.0, SEP OF NEPTUNE-ARCS GALATEA FROM EARTH GT 0.7" SOLAR SYSTEM Planet Neptune with Triton's diffraction spikes not crossing the ring region on the left side of the planet. PLANET RING NEPTUNE STD=NEPTUNE NOT OLG OF TRITON BETWEEN 0.0 11.0, NOT OLG OF TRITON BETWEEN 169.0 180.0 SOLAR SYSTEM Planet Neptune with arcs on the left (east) ansa and Triton's diffraction spikes not crossing the ring region. Galatea separated from the arcs. PLANET RING NEPTUNE STD=NEPTUNE OLG OF NEPTUNE-ARCS BETWEEN 58.0 118.0, NOT OLG OF TRITON BETWEEN 0.0 11.0, NOT OLG OF TRITON BETWEEN 169.0 180.0, SEP OF NEPTUNE-ARCS GALATEA FROM EARTH GT 0.7" ACS/HRC Imaging No No F330W ACS/HRC Imaging No No F475W ACS/HRC Imaging No No F555W ACS/HRC Imaging No No F606W ACS/HRC Imaging No No F625W ACS/HRC Imaging No No F775W ACS/HRC Imaging No No F814W ACS/HRC Imaging No No CLEAR1S ACS/HRC Imaging Yes No F330W ACS/HRC Imaging Yes No F475W ACS/HRC Imaging Yes No F555W ACS/HRC Imaging Yes No F606W ACS/HRC Imaging Yes No F625W ACS/HRC Imaging Yes No F775W ACS/HRC Imaging Yes No F814W ACS/HRC Imaging Yes No CLEAR1S Neptune at first schedulable opportunity. Initial arc tracking and photometry. Experiments with exposure times, intentional overexposures, planet off the field of view, and coronagraph. Please schedule as early in the window as possible. (Tic-Visit :proposal-id 10398 :visit-id "01" :proposal-version -1 :trans-version "20040225" :date "06-Oct-2004 10:30:56.0" :trans-errors '(:WARNINGS 2 :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 442320 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10398 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "01" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2633 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3004 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10398 :visit-id "01" :orbit-number 2 :pcs-time 300 :si-vis-utilization 2702 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3004 :pcs-gap 0 ) false -1 -1 Neptune deliberately positioned just off the top of the image. Long CLEAR exposures for rings and moons, with Naiad crossing maximum elongation. Neptune behind the occulting mask. (Tic-Visit :proposal-id 10398 :visit-id "02" :proposal-version -1 :trans-version "20040225" :date "18-Nov-2004 20:17:55.0" :trans-errors '(:WARNINGS 1 :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 147904 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10398 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "02" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2620 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3004 :pcs-gap 0 ) false -1 -1 Long CLEAR exposures for arcs and moons, with Thalassa crossing maximum elongation. Neptune behind the occulting mask. (Tic-Visit :proposal-id 10398 :visit-id "03" :proposal-version -1 :trans-version "20040225" :date "18-Nov-2004 20:18:12.0" :trans-errors '(:WARNINGS 1 :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 147904 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10398 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "03" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2620 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3004 :pcs-gap 0 ) false -1 -1 Long CLEAR exposures for arcs and moons, with the arcs visible. Neptune behind the occulting mask. (Tic-Visit :proposal-id 10398 :visit-id "04" :proposal-version -1 :trans-version "20040225" :date "18-Nov-2004 20:18:41.0" :trans-errors '(:WARNINGS 1 :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 331920 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10398 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "04" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2620 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3004 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10398 :visit-id "04" :orbit-number 2 :pcs-time 300 :si-vis-utilization 2699 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3004 :pcs-gap 0 ) false -1 -1 Ring and arc photometry and temporal coverage. Please schedule as early in the window as possible, to maximize temporal coverage. (Tic-Visit :proposal-id 10398 :visit-id "06" :proposal-version -1 :trans-version "20041004" :date "02-Feb-2005 10:19:49.0" :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 331232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10398 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "06" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2662 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 0 Ring and arc photometry and temporal coverage. (Tic-Visit :proposal-id 10398 :visit-id "07" :proposal-version -1 :trans-version "20041004" :date "02-Feb-2005 10:21:58.0" :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 331232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10398 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "07" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2658 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 0 Ring and arc photometry and temporal coverage. A comparison between the arcs at the left and right ansas. Schedule as close in time to Visit 09 as possible. (Tic-Visit :proposal-id 10398 :visit-id "08" :proposal-version -1 :trans-version "20041004" :date "02-Feb-2005 10:23:58.0" :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 331232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10398 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "08" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2662 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 0 Ring and arc photometry and temporal coverage. A comparison between the arcs at the left and right ansas. Schedule as close in time to Visit 08 as possible. (Tic-Visit :proposal-id 10398 :visit-id "09" :proposal-version -1 :trans-version "20041004" :date "02-Feb-2005 07:40:08.0" :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 331232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10398 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "09" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2658 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 0 Ring and arc photometry and temporal coverage. (Tic-Visit :proposal-id 10398 :visit-id "10" :proposal-version -1 :trans-version "20041004" :date "02-Feb-2005 10:49:20.0" :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 331232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10398 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "10" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2662 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 0 Ring and arc photometry and temporal coverage. Please schedule as late in the window as possible, to maximize temporal coverage. (Tic-Visit :proposal-id 10398 :visit-id "11" :proposal-version -1 :trans-version "20041004" :date "02-Feb-2005 07:42:50.0" :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 331232 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10398 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10398 :visit-id "11" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2658 :al-overhead-at-end 0 :internal-dur-at-end 340 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 0