0Assigned ID: 6911
----- Attempting Submission 1 (Fri Aug 22 20:53:36 GMT 2025) -----
HST Phase I Proposal 6911 successfully submitted.
Receipt: # 6911-1the BOT safety flag for HD 28237 is caused by FUV mag "-999" in Galex catalog
2025NOV05: increased NUV TARG/ACQ exposure time for Visit12/Target12 from 50s
to 116s following Phase2 review based on GALEX NUV magnitude
2025NOV05: updated ETC number for Visit12-1155347110----- Attempting Submission 1 (Wed Sep 03 19:40:21 GMT 2025) -----
----- Attempting Submission 2 (Wed Nov 05 13:34:22 GMT 2025) -----
HST Phase II Proposal 18188 successfully submitted.
Receipt: # 18188-2
----- Attempting Submission 3 (Wed Nov 05 13:39:47 GMT 2025) -----All Tools were ranCompleting the Hyades High-Energy Main SequenceThe nearby Hyades cluster (d=47 pc) is a gold standard for the Solar-Stellar Connection: it presents an accessible, well-populated Main Sequence of Sunlike stars of the same age (~600 Myr) and chemical composition; ideal subjects to test the origins and consequences of high-energy (X-rays and ultraviolet) magnetic activity. An existing joint Chandra/HST project has covered the cooler part of the Hyades MS, G9V-K7V. The present proposal is to complete the MS coverage with new HRC-I and COS pointings on the warmer side, F7-G6. Chandra X-rays and HST FUV emission lines provide complementary views of the multi-MK coronal activity, to help constrain theories of exoplanet atmospheric escape as well as the dynamo generation of stellar magnetic fields.The objective of the observing program is to obtain full-coverage FUV spectra of 12 sunlike stars in the nearby Hyades open cluster (d~47 pc). The stars in the cluster are young (~600 Myr), rotating more rapidly than the 4.5 Gyr Sun, and are expected to display hot outer atmospheres (10,000 K - 10 MK) symptomatic of strong magnetic dynamo activity. The resulting FUV spectra will be dominated by strong emission lines, such as C II 133 nm (30,000 K), Si III 120 nm (50,000 K), Si IV 139 nm (80,000 K), C IV 154 nm (100,000 K), and N V 123 nm (200,000 K). FUV line intensitites of the Hyades targets can be estimated from HST/STIS spectra of young field stars of the solar neighborhood, such as Chi1 Orionis (G0V), and are expected to be too faint for the STIS echelle modes, and marginal for the COS G modes, at least in the 1-orbit pointings desirable for a survey program (in support of a Chandra survey of the coronal X-ray emissions of the stars). This leaves the more sensitive L modes of both STIS and COS as options to obtain high-quality FUV tracings (integrated line intensities with S/N close to, or exceeding, 20:1). The COS G140L-1105 setting is preferred over STIS G140L-1425, because the COS version has significantly higher spectral resolution, important for separating close spectral blends.
The targets are captured using a COS NUV imaging ACQ, which requires the Bright Object Aperture and Mirror-A or B depending on the target brightness. The COS ETC-predicted ACQ exposure times, based on the target V magnitude and appropriate Castelli-Kurucz model SEDs, range from a few seconds to about 40 s. The subsequent G140L-1105 exposure is in Time-Tag mode, on Segment A, utilizing the four default FP-POS splits, to fill out the single orbit. The per-split exposure times vary from 462-485 s, for a total of about 1.9 ks. The S/N estimates in the COS spectroscopic ETC were obtained using a distance-scaled STIS FUV+NUV spectrum of the Hyades-age G0V star Chi1 Ori, mentioned earlier. There were no safety issues identified by the ETC. (The bright Lyman-alpha line predicted from the reference star Chi1 Ori was not flagged by the ETC, and the actual hydrogen intensity for the Hyades stars would be further reduced by the additional ISM absorption between 9 pc Chi1 Ori and the 47 pc cluster members.)PI Ayres has 35 years of experience with HST and its multiple generations of UV spectrographs, including especially STIS and COS.Stellar Physics and Stellar Types6falsetruefalsefalsefalsefalsetrueSECONDARYCHANDRA27200229falseSUPPORTEDSTARG V-IVNOJ2000J2000STARG V-IVNOJ2000J2000STARG V-IVNOJ2000J2000STARG V-IVNOJ2000J2000STARG V-IVNOJ2000J2000STARF3-F9NOJ2000J2000STARF3-F9NOJ2000J2000STARF3-F9NOJ2000J2000STARG V-IVNOJ2000J2000STARG V-IVNOJ2000J2000STARG V-IVNOJ2000J2000STARF3-F9NOJ2000J2000COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105COS/FUVSpectroscopicNoNoG140L1105The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "01"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:24.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "01"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G0V 6000 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.811 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "02"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:25.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "02"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G2V 5750 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.047 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "03"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:26.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "03"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2593
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G2V 5750 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.03 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "04"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:27.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "04"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G8V 5500 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.597 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "05"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:28.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "05"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G8V 5500 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.427 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "06"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:29.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "06"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models F8V 6250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.444 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "07"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:30.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "07"
:obset-id "07"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "07"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models F8V 6250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.404 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "08"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:31.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "08"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2593
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models F8V 6250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.482 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "09"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:31.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "09"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G8V 5500 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.572 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "10"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:32.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "10"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models G2V 5750 4.5
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.898 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.The scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "11"
:proposal-version -1
:trans-version "20250624"
:date "03-Sep-2025 13:39:33.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "11"
:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "11"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models F8V 6250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 7.501 in filter Johnson/VUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets./Users/ayres/Documents/SUPERIOR-OCT2014/PROPs/HST-CYC33/apt/OP-cache/18188-revised-v12.xmlThe scheduling data was generated by CASM 33.1.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18188
:visit-id "12"
:proposal-version -1
:trans-version "20250624"
:date "05-Nov-2025 08:29:22.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 52416
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18188
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18188
:visit-id "12"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2595
:al-overhead-at-end 0
:internal-dur-at-end 348
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)true10Spectrum: Castelli-Kurucz Models F8V 6250 4.0
Extinction E(B-V): None
Normalization: Renormalized to abmag = 12.98 in filter GALEX/NUVUser uploaded spectrum: CHI1ORI-to-Hyads.txt-- Hyades age G0 dwarf Chi1 Orionis STIS FUV+NUV echelle spectra scaled to average 46 pc distance of Hyades targets.