0
Assigned ID: 7171
----- Attempting Submission 1 (Wed Apr 15 17:23:09 GMT 2026) -----
0
----- Attempting Submission 1 (Mon Aug 10 08:43:32 GMT 2026) -----
Probing the Chemical Makeup of Planetary Debris Around the Youngest White Dwarfs
The pristine hydrogen/helium atmosphere of white dwarfs are frequently polluted by planetary material. Spectroscopic observations of these systems allow us to infer the accreted bodies through measurements of photospheric abundances. This technique has been successfully applied to hundreds of white dwarfs, the vast majority of which are below 25,000K. In contrast, hot (and commensurately young) white dwarfs have remained largely unexplored, despite evidence that many are accreting planetary material. In this proposal, we aim to broaden ultraviolet coverage for 17 white dwarfs known to be polluted, identified from previous FUSE observations, in order to characterise the accreted material.
With complete ultraviolet spectra of this sample, we will directly constrain the composition of material accreted by hot white dwarfs. By measuring both volatile (e.g. C, N, O, P, S) and refractory (e.g. Al, Si, Ca, Fe, Ni) elements, we will compare their relative abundances to distinguish between different sources of accreted material. In particular, we will test whether these systems accrete volatile-rich atmospheres from photoevaporated giant planets or predominantly rocky debris rapidly delivered to the white dwarf surface. Second-generation planets are predicted to form from the ejecta of AGB progenitors and should exhibit enhancements in s-process elements (e.g. Sr, Nb, Ba, Pb). The ultraviolet provides access to key transitions of these elements in hot white dwarfs, enabling us to search for candidates. Also, the prevalence of high-ionisation lines in hot white dwarfs may indicate the presence of chromospheres, offering further insight into their atmospheric structure.
We will get medium resolution spectroscopy of 17 hot white dwarfs known to be enriched, allowing us to measure their photospheric abundances and determine the origin of the external material. For all targets, we use STIS NUV with grating E230M and central wavelength 1978A with an aperture of 0.2x0.2. For the targets with no existing FUV spectroscopy from HST, we also obtain a spectrum using the E140M grating at a central wavelength of 1425A with an aperture of 0,2x0.2. We split the visits to a maximum of three orbits to help scheduling. The exposures will obtain a S/N~30 at the wavelength regions of interest.
J Williams is an expert in HST observations of planetary accreting white dwarfs, and he will lead the analysis of the data from this program.
B Gaensicke is an expert in the use of Hubble's far-ultraviolet spectrographs, and will support the data analysis and modelling.
A Swan is an expert in evolved planetary systems and will support in the interpretation of the accreted material.
D Koester is the author of the white dwarf model atmosphere which we will use, and has an encyclopedic knowledge of white dwarf physics.
S Sahu is an expert in the analysis of ultraviolet spectra of white dwarfs, and will support the analysis of the data of this program.
D Wilson is an expert in the use of STIS and will support the implementation of observations and overall data analysis of this program.
N Stone is an expert in second generation planet compositions and will support the interpretation of the data of this program.
Exoplanets and Exoplanet Formation
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SUPPORTED
STAR
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This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STAR
DA
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM.
J2000
J2000
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
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STIS/NUV-MAMA
Spectroscopic
No
No
E230M
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STIS/NUV-MAMA
Spectroscopic
No
No
E230M
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STIS/FUV-MAMA
Spectroscopic
No
No
E140M
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Spectroscopic
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STIS/FUV-MAMA
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No
E140M
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No
No
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STIS/NUV-MAMA
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No
No
E230M
1978
STIS/NUV-MAMA
Spectroscopic
No
No
E230M
1978
STIS/FUV-MAMA
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E140M
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STIS/NUV-MAMA
Spectroscopic
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(Tic-Orbit
:proposal-id 18421
:visit-id "09"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v10.xml
(Tic-Visit
:proposal-id 18421
:visit-id "10"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:47.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 661424
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "10"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
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:low-sky "N"
:pcs-visibility 3044
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)
(Tic-Orbit
:proposal-id 18421
:visit-id "10"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v11.xml
(Tic-Visit
:proposal-id 18421
:visit-id "11"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:48.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 661424
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "11"
:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "11"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "11"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v12.xml
(Tic-Visit
:proposal-id 18421
:visit-id "12"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:49.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 817968
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "12"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "12"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "12"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v13.xml
(Tic-Visit
:proposal-id 18421
:visit-id "13"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:50.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 817968
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "13"
:obset-id "13"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "13"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "13"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
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:low-sky "N"
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:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "13"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v14.xml
(Tic-Visit
:proposal-id 18421
:visit-id "14"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:51.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 1026720
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
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:obset-id "14"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "14"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "14"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
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:dark-offset NIL
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:low-sky "N"
:pcs-visibility 3001
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)
(Tic-Orbit
:proposal-id 18421
:visit-id "14"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v15.xml
(Tic-Visit
:proposal-id 18421
:visit-id "15"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:52.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 817968
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "15"
:obset-id "15"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "15"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
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:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "15"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
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:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "15"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v16.xml
(Tic-Visit
:proposal-id 18421
:visit-id "16"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 817968
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "16"
:obset-id "16"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "16"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "16"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "16"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v18.xml
(Tic-Visit
:proposal-id 18421
:visit-id "18"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 678800
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "18"
:obset-id "18"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "18"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "18"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "18"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v17.xml
(Tic-Visit
:proposal-id 18421
:visit-id "17"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:54.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 539680
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "17"
:obset-id "17"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "17"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 2231
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "17"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2664
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v19.xml
(Tic-Visit
:proposal-id 18421
:visit-id "19"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:55.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 713632
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "19"
:obset-id "19"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "19"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 440
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
true
1
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v20.xml
(Tic-Visit
:proposal-id 18421
:visit-id "20"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:56.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 817968
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "20"
:obset-id "20"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "20"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "20"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "20"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v21.xml
(Tic-Visit
:proposal-id 18421
:visit-id "21"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:56.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 678800
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "21"
:obset-id "21"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "21"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "21"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "21"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v22.xml
(Tic-Visit
:proposal-id 18421
:visit-id "22"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:57.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 452672
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "22"
:obset-id "22"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "22"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "22"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v23.xml
(Tic-Visit
:proposal-id 18421
:visit-id "23"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:58.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 609216
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "23"
:obset-id "23"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "23"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "23"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 316
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "23"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
3
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v24.xml
(Tic-Visit
:proposal-id 18421
:visit-id "24"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:59.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 383088
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "24"
:obset-id "24"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "24"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "24"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v25.xml
(Tic-Visit
:proposal-id 18421
:visit-id "25"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:11:59.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 783216
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "25"
:obset-id "25"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "25"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 440
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)
true
1
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v26.xml
(Tic-Visit
:proposal-id 18421
:visit-id "26"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:12:00.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 452672
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "26"
:obset-id "26"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "26"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "26"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v27.xml
(Tic-Visit
:proposal-id 18421
:visit-id "27"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:12:01.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 452672
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "27"
:obset-id "27"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "27"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "27"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2646
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
C:\Users\jamie\Downloads\OP-cache\HST_18421_phaseII-v28.xml
(Tic-Visit
:proposal-id 18421
:visit-id "28"
:proposal-version -1
:trans-version "20260618"
:date "05-Aug-2026 12:12:02.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 2000944
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18421
:visit-id "28"
:obset-id "28"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18421
:visit-id "28"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2631
:al-overhead-at-end 0
:internal-dur-at-end 2264
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3011
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18421
:visit-id "28"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2631
:al-overhead-at-end 0
:internal-dur-at-end 578
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3011
:pcs-gap 0
)
true
2
0