Hi, Andy, I have opened the windows to +/- 0.25 orbits in the after commands, as you suggested. I am also trying to make exp. 3 longer in each case, to better fill the visit windows. In the orig. submission, I got errors if I did not leave about 1 1/2 min. at the end of each orbit, which seems wasteful. ----- Submission 1 (Fri May 13 23:30:24 GMT 2005) ----- ----- Submission 2 (Wed Jul 20 14:15:28 GMT 2005) ----- Assigned ID: 330 ----- Submission 1 (Fri Jan 21 20:02:48 GMT 2005) ----- ----- Submission 3 (Sun Jan 23 03:13:18 GMT 2005) ----- ACS Imaging of the Uranus Aurora and Hydrogen Corona ACS SBC UV observations of Uranus are proposed with dual purposes that can be achieved with a single set of observations. First, we propose to observe the very unusual auroral of Uranus for the first time since IUE and Voyager in the 1980's. The Uranus aurora are centered on the magnetic poles, corresponding to the 60 deg. tilted magnetic moment, closer to the equator than the rotational poles. The brighter auroral emission appears around the weaker magnetic pole. The auroral emissions are highly variable, as recorded with IUE, and the rotational phase of Uranus is not known. The observations will therefore cover the extent of a Uranus rotation (17.29 hours), and will be repeated one-half solar rotation later to allow for variations in the solar wind at Uranus. The high sensitivity of the ACS SBC at long wavelengths will increase the sensitivity to auroral H2 emissions, and observations in cycle 14 near solar minimum will limit the sky background and reflected solar emissions from the Uranus disc. Secondly, these images will measure the extended hydrogen corona of Uranus, first seen by the Voyager 2 UVS. We propose to model the distribution of the hydrogen corona to determine the source processes in the Uranus upper atmosphere, by comparison with model runs from an exospheric code.
These observations are to make images of the H Ly alpha emisson from the atmosphere and aurora on Uranus, including the extended cloud of superthermal H around the planet. We hope to detect auroral emissions from the planet disc, and since the rotational ephemeris of Uranus has been lost since the Voyager encounter in 1986, images must be taken over a complete Uranus rotation to cover all phases, including when the auroral ovals may be pointing toward the Earth. This proposal is to observe Uranus from 4 sides separated by approx. 90 deg. of rotation, and to repeat this series about 2 weeks later, for a total of 8 orbits. In one 5 orbit ACS SBC visibility period, two quadrants can be observed (Uranus rotation period = 17.24 hours, and 90 deg. rotation takes 4.3 hours) by observations separated by two orbits. If, on day One, Uranus is observed in the 1st and 4th orbits during the 5 orbit ACS visibility period, and on the following day Two during the 2nd and 5th orbits of the next visibility period, this will correspond to relative longitudes on Uranus of 0 and 100 deg. on day One, and 174 and 274 deg. on day Two. This assumes the visibility period starts at approx. the same local time each day. The cycle should be repeated about 2 weeks later, when the solar wind conditions will have passed through 1/2 solar rotation for the most likely change in solar wind conditions at Uranus. The observations also need to be scheduled close to Uranus opposition to minimize the geocoronal Ly alpha background, but only within +/- one month. Under 2 gyro mode, the main period of visibility for any object is the month before Uranus opposition around 5 Sept. 2005, and that is the one that is proposed here. SOLAR SYSTEM 12 false 0.0 false false false false false SUPPORTED SOLAR SYSTEM PLANET Planet Uranus STD=URANUS ACS/SBC Imaging No No F115LP ACS/SBC Imaging No No F140LP ACS/SBC Imaging No No F165LP /private/tmp/OPVisit606.xml First visit to Uranus, this is the first orbit at the start of a sequence. ACS SBC MAMA observations are limited to 5 orbits/day outside SAA, about the same time each day. It is not important which side of Uranus is observed at the start of this program, as long as all 4 quadrants are observed over 2 days. In this visit 1, observe in 1st orbit in 5 orbit visibility period, then key timing of visits 2-4 to this time. (Tic-Visit :proposal-id 10502 :visit-id "01" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 09:56:14.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "01" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2804 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1666.xml /private/tmp/OPVisit607.xml Observe Uranus three orbits after start of visit 1, i.e. two orbits have passed since the end of visit 1. This timing lets Uranus rotate 100 deg. between visits 1 and 2, giving the second of the four quadrants needed in two days. (Tic-Visit :proposal-id 10502 :visit-id "02" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 10:05:52.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "02" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2804 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1667.xml Observe Uranus one day after visits 1 and 2, to get the remaining two quadrants in the next 5 orbit visibility window. This visit sees Uranus at a longitude 174 deg. (plus one complete rotation) after visit 1. The requested time is 16 orbits after the start of visit 1, this is expected to be the 2nd orbit in the 5 orbit visibility period on the second day. (Tic-Visit :proposal-id 10502 :visit-id "03" :proposal-version -1 :trans-version "20050323" :date "13-May-2005 18:24:08.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "03" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /Files/HST/HST Cycle 14/Phase II Prop./OP-cache/10502-v03.xml /private/tmp/OPVisit601.xml Observe Uranus three orbits after start of visit 3, i.e. two orbits have passed since the end of visit 3. This timing lets Uranus rotate 100 deg. between visits 3 and 4, or a longitude of 274 deg. with respect to the start of orbit 1, giving the last of the four quadrants needed in two days. (Tic-Visit :proposal-id 10502 :visit-id "04" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 09:51:39.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "04" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1668.xml /private/tmp/OPVisit602.xml Repeat series of observations in visit 1-4, approx. two weeks after visits 1-4. Exact start date is not important, but sequence of orbits is laid out as in visits 1-4, and visits 6-8 must start at requested times with respect to the start of visit 5. (Tic-Visit :proposal-id 10502 :visit-id "05" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 09:52:22.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "05" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1669.xml /private/tmp/OPVisit603.xml Equivalent to visit 2 in second series of observations, i.e. 3 orbits after visit 5. (Tic-Visit :proposal-id 10502 :visit-id "06" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 09:53:08.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "06" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1670.xml /private/tmp/OPVisit604.xml Equivalent to visit 3 in second series of observations, i.e. 16 orbits after visit 5. (Tic-Visit :proposal-id 10502 :visit-id "07" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 09:53:53.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "07" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1671.xml /private/tmp/OPVisit605.xml Equivalent to visit 4 in second series of observations, i.e. 3 orbits after visit 7. (Tic-Visit :proposal-id 10502 :visit-id "08" :proposal-version -1 :trans-version "20050323" :date "20-Jul-2005 09:54:42.0" :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 111088 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10502 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10502 :visit-id "08" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2744 :al-overhead-at-end 0 :internal-dur-at-end 160 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3236 :pcs-gap 0 ) true 1 0 /private/tmp/OPVisit1672.xml