0 Assigned ID: 1043 ----- Attempting Submission 1 (Fri Apr 07 22:49:24 GMT 2017) ----- HST Phase I Proposal 1043 (holler_dysnomia_cycle25.apt) successfully submitted. Receipt: # 1043-1 Unschedulable Visit Unschedulable Visit Unschedulable Visit Unschedulable Visit Unschedulable Visit Unschedulable Visit 0 ----- Attempting Submission 1 (Thu Jul 20 01:08:17 GMT 2017) ----- HST Phase II Proposal 15171 (holler_dysnomia_cycle25.apt) successfully submitted. Receipt: # 15171-1 ----- Attempting Submission 2 (Wed Nov 22 16:48:54 GMT 2017) ----- HST Phase II Proposal 15171 (holler_dysnomia_cycle25.apt) successfully submitted. Receipt: # 15171-2 ----- Attempting Submission 3 (Wed Dec 20 21:41:30 GMT 2017) ----- HST Phase II Proposal 15171 (holler_dysnomia_cycle25.apt) successfully submitted. Receipt: # 15171-3 ----- Attempting Submission 4 (Fri Jan 05 21:54:14 GMT 2018) ----- Visits that are scheduled or previously executed are causing "timing constraint" issues, preventing the visit planner from running for these visits. The visit planner was run successfully for the repeat visit (#53). The rotation period, orbit, and mass of Eris' satellite Dysnomia Almost 80 satellite systems have been identified in the trans-Neptunian region in the outer Solar System. These systems fall into two classes: equal mass, wide separation binaries and large primaries with relatively small satellites. The existence of these two distinct classes suggests different formation mechanisms of capture and giant impact, respectively, but there is no way to confirm this without more in-depth observations of a given system. Little is known about the majority of these satellite systems besides the orbital period and the relative brightness of the components. The orbital period provides the total system mass but does nothing to constrain the masses of the individual components. The mass and rotation period of the satellite can provide valuable information about the tidal state and thus the formation mechanism of the second class of binary systems. Previous observations of large trans-Neptunian objects (TNOs) with multiple satellites point to formation by giant impact, but never before has this kind of investigation been performed for a large TNO with only one satellite. In this work, we propose to observe Eris and its satellite Dysnomia with the WFC3 instrument to provide useful constraints on the mass Dysnomia, calculate Dysnomia's rotation period, and compute an improved orbit solution for Dysnomia, with the ultimate goal of understanding the origin of this and other large TNO binary systems. These observations of Eris and its satellite, Dysnomia, are designed to provide data for two separate investigations: constructing a rotation light curve of Dysnomia and measuring the wobble of Eris. Data for a third investigation, a new calculation of Dysnomia's orbit, come from the the observations that satisfy the other two investigations. To measure the wobble of Eris, the motion of Eris around the system barycenter due to the gravitational influence of Dysnomia, a majority of the orbits are timed to coincide with the maximum elongation of Dysnomia; the times of maximum elongation were extrapolated from Brown and Schaller (2007). Al six orbits are planned to occur within one orbital period of Dysnomia (15.774 days) to avoid the effects of changing phase angle. Two of the six orbits in this program are timed to coincide with one maximum elongation, while two more are timed to coincide with the opposite maximum elongation. We place 3-7 HST orbits between the two orbits at each maximum elongation. The two maximum elongation sets are separated by ~7.9 days (about half of a rotation period). The remaining two orbits are set up to be made at some point in a large range between the maximum elongations (one on either side of Dysnomia's orbit). The large ranges for these two orbits satisfy two goals: enable more flexible scheduling and mitigate aliasing in the determination of Dysnomia's rotation period. Photometry will be performed on all the images to extract the flux from Dysnomia and construct a rotational light curve. Additionally, the short time between the two orbits at each maximum elongation serve the purpose of testing for short (~5-12 hour) periods. Relative astrometry between Eris and Dysnomia in each image will be used to compute an orbital solution for Dysnomia. In order to obtain enough stars for the absolute astrometry required to measure Eris' wobble, a full readout of the WFC3/UVIS detector is required. This means the minimum time for each image is 348 seconds to prevent a loss of time for a buffer dump. Four of these images are planned using the WFC-UVIS-DITHER-BOX, a four-point box dither used for sub-sampling the PSF. Each box dither is followed by one 585-second image to fill out the orbit; some leeway is left so as not to fill the entire orbit and therefore open up the scheduling options. Eris saturates in the 585-second images, but is not saturated in the 348-second images, allowing for the possibility of obtaining photometric measurements of Eris for construction of a rotational light curve. Large orientation ranges are provided to prevent Dysnomia from falling in the same columns as Eris, especially for the 585-second images where Eris saturates and may bleed into nearby pixels in the columns. The orientation ranges are not meant to avoid the diffraction spikes, although this was the original plan; such constraints, combined with the timing constraints, placed significant constraints on the observations as a whole and rendered them unschedulable. Solar System 0 false false false true false false SUPPORTED SOLAR SYSTEM NO DWARF-PLANET Eris STD=ERIS TYPE=POS_ANGLE,RAD=20,ANG=225,REF=NORTH EARTH WFC3/UVIS Imaging No No F606W POS-TARG DITHER 0.173 LINE 0.112 false true 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false /private/var/folders/mr/x7khydd92hlc46tp8qw5jrch0001wj/T/OPVisit7874323143925421013.xml Using ephemeris for target 15171-01-ERIS-OFFSET ephemeris data for target 15171-01-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 Timing link suitability includes constraints ([Sequence (01 02 03 04 05 06) within 15.8 days] [02 After 01 by 0.2 to 0.5 days] [03 After 01 by 1.7 to 6.3 days] [04 After 01 by 7.6 to 8.0 days] [05 After 01 by 9.1 to 9.4 days] [06 After 01 by 10.6 to 14.1 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1514787275000 79.22622539587661 (Tic-Visit :proposal-id 15171 :visit-id "01" :proposal-version -1 :trans-version "20171009" :date "05-Jan-2018 16:47:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 15171 :visit-id "01" :obset-id "A1" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2830 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 /Users/bholler/Documents/Proposals/OP-cache/holler_dysnomia_cycle25-v02.xml Using ephemeris for target 15171-02-ERIS-OFFSET ephemeris data for target 15171-02-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 Timing link suitability includes constraints ([Sequence (01 02 03 04 05 06) within 15.8 days] [02 After 01 by 0.2 to 0.5 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1514804440000 79.22624693219888 (Tic-Visit :proposal-id 15171 :visit-id "02" :proposal-version -1 :trans-version "20171009" :date "20-Dec-2017 16:41:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2798 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 /Users/bholler/Documents/Proposals/OP-cache/holler_dysnomia_cycle25-v03.xml Using ephemeris for target 15171-03-ERIS-OFFSET ephemeris data for target 15171-03-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 Timing link suitability includes constraints ([Sequence (01 02 03 04 05 06) within 15.8 days] [03 After 01 by 1.7 to 6.3 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1514958933000 79.22642771448159 (Tic-Visit :proposal-id 15171 :visit-id "03" :proposal-version -1 :trans-version "20171009" :date "20-Dec-2017 16:41:05.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2798 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 /Users/bholler/Documents/Proposals/OP-cache/holler_dysnomia_cycle25-v53.xml Using ephemeris for target 15171-53-ERIS-OFFSET ephemeris data for target 15171-53-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15171 :visit-id "53" :proposal-version -1 :trans-version "20171009" :date "05-Jan-2018 16:33:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "53" :obset-id "53" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "53" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2798 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 /Users/bholler/Documents/Proposals/OP-cache/holler_dysnomia_cycle25-v04.xml Using ephemeris for target 15171-04-ERIS-OFFSET ephemeris data for target 15171-04-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 Timing link suitability includes constraints ([Sequence (01 02 03 04 05 06) within 15.8 days] [04 After 01 by 7.6 to 8.0 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1515473924000 69.9 (Tic-Visit :proposal-id 15171 :visit-id "04" :proposal-version -1 :trans-version "20171009" :date "20-Dec-2017 16:41:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2798 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 /Users/bholler/Documents/Proposals/OP-cache/holler_dysnomia_cycle25-v05.xml Using ephemeris for target 15171-05-ERIS-OFFSET ephemeris data for target 15171-05-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 Timing link suitability includes constraints ([Sequence (01 02 03 04 05 06) within 15.8 days] [05 After 01 by 9.1 to 9.4 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1515576916000 67.85937468623041 (Tic-Visit :proposal-id 15171 :visit-id "05" :proposal-version -1 :trans-version "20171009" :date "20-Dec-2017 16:41:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2798 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0 /Users/bholler/Documents/Proposals/OP-cache/holler_dysnomia_cycle25-v06.xml Using ephemeris for target 15171-06-ERIS-OFFSET ephemeris data for target 15171-06-ERIS-OFFSET does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 17.335 to 19.091. ephemeris interval: 17.365 to 20.001 Timing link suitability includes constraints ([Sequence (01 02 03 04 05 06) within 15.8 days] [06 After 01 by 10.6 to 14.1 days]) The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1515925912000 68.72448696791321 (Tic-Visit :proposal-id 15171 :visit-id "06" :proposal-version -1 :trans-version "20171009" :date "20-Dec-2017 16:41:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15171 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15171 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2798 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3202 :pcs-gap 0 ) true 1 0