0Assigned ID: 7039
----- Attempting Submission 1 (Mon Apr 13 21:45:38 GMT 2026) -----
HST Phase I Proposal 7039 successfully submitted.
Receipt: # 7039-1
----- Attempting Submission 2 (Wed Apr 15 14:12:38 GMT 2026) -----
HST Phase I Proposal 7039 successfully submitted.
Receipt: # 7039-2INEFFICIENT ORDERING OF FP-POS POSITIONS
INEFFICIENT ORDERING OF FP-POS POSITIONS0----- Attempting Submission 1 (Mon Aug 17 23:16:02 GMT 2026) -----Change in FP-POS positions happens between orbitsThe Intra-Group Medium of Local Group AnaloguesWe propose to make the first detections of the photo-ionized and collisionally-ionized phases of the Intra-Group Medium (IGrM) of small, spiral-rich galaxy groups like our Local Group. Unlike massive X-ray detected groups and clusters, the low-mass IGrM is predicted to be dominated by cool/warm gas uniquely detectable using HST/COS. While dozens of COS programs have characterized the Circum-Galactic Medium (CGM) of individual galaxies, the larger context for current-day star formation, the small, spiral-rich group IGrM, has not been detected nor had its baryons inventoried; nor has the IGrM of our Local Group (M_halo = 10^12.7 M_Sun) been detected unambiguously due to distance uncertainties. By avoiding sight lines passing through the CGM of individual group galaxies, these high-S/N FUV spectra will probe the cool (Ly-alpha, Si II & Si III) and warm (Ly-alpha & O VI) IGrM in Local Group analogues with 10^12.4 < M_halo < 10^13.8 M_sun for the first time. From the COS spectra we will estimate: (1) the covering fraction and extent of H I Ly-alpha and metal-bearing absorbers; (2) the baryon content of the IGrM (simulations suggest 10-30% of baryonic closure); (3) the fraction of absorbers that are escaping, providing evidence that the IGrM is either a nearly isothermal "closed box" or is "feedback flattened"; and (4) the gas retention mass above which all baryons are retained. In comparison with previous COS studies of X-ray emitting groups, this mass limit will be compared to the halo mass above which passive galaxies and an X-ray emitting IGrM occur. We request 42 orbits to observe the best 6 targets with S/N~12 at the O VI doublet.Our low-mass, group-selected sample contains 6 AGN sight lines probing low-mass galaxy groups at z=0.075-0.15. This range was selected such that the O VI 1032, 1038 A doublet redshifts into the COS/G130M spectral range at good sensitivity, while Ly-alpha 1216 A, Si II 1190, 1193 A (1260 A for some groups) and Si III 1206 A are also present. We further required that both Ly-alpha and O VI 1032 A fall in spectral regions free of strong Galactic absorption and gain sag. Two slightly-higher-redshift groups (55394 & 36750) need to be observed with the G130M/1291 setting to cover the wavelengths of Ly-alpha and O VI simultaneously. A range of impact parameters and group halo masses is well-represented. Using the SDSS spectroscopic redshift information, we verified that the nearest individual bright group galaxy to each sight line is >1.7 virial radii away (typically >500 kpc in projection); almost all are >2 virial radii away, well outside the region of bound CGM gas. This criteria makes sure that any detected absorption is associated with the intragroup medium and not the CGM of an individual galaxy (see e.g., Prochaska+11, Stocke+13, Keeney+17). We estimate the far-UV flux of each AGN from GALEX FUV-band photometry or previous low-resolution FUV spectra, where available.
The COS ETC was used to estimate the exposure time necessary for our required S/N ~ 12 per resolution element spectra at the wavelength of the redshifted O VI doublet and the results rounded to the nearest orbit.
The only previous HST/COS program which attempted to observe low-mass group gas is GO-13314 (McCabe+21). However, our detailed scrutiny of each McCabe+21 sight line (including new galaxy spectroscopy by us) finds that 15 of the 18 are too close to a bright group galaxy to provide unambiguous IGrM probes. The close galaxy proximity requires that any UV absorption detected must be ascribed to CGM, not intragroup gas. The COS spectra obtained by McCabe+21 have lower S/N (< 10 compared to ~12 for this proposed study) so that fewer O VI lines (8/18) are detected. GO-13314 aside, only two Berlind groups were probed by previous high-S/N spectra. For PG 0953+415 a COS (S/N ~ 40) spectrum plus excellent FUSE data detect a possible broad Ly-alpha absorber and two probable O VI absorbers in a low-mass group at z = 0.042. A low-mass Berlind group at z = 0.19 in the PG 1121+420 sight line (S/N = 23) has detections in Ly-alpha, O VI, and several other ions at +231 km/s, likely bound to that group. In summary, we add 5 archival spectra (3 from GO-13314 and 2 from GTO data) to our low-mass group IGrM sample.
Ground-based multi-object spectroscopy (MOS) will be obtained using MMTO/Hectospec to provide group galaxy redshifts, galaxy type classifications and star-formation rates complete to ~0.2 L* over a 40-arcmin field of view for all 11 of these groups. Ground-based MOS is already available for the two COS-GTO archival sightlines. These deep MOS observations will refine the detailed characteristics of each group (e.g., stellar and halo masses, velocity dispersion, group centroid position) for better comparison with the UV absorption-line data. These deeper data are essential for the best results from this project since basic group parameters from Berlind+06 are accurate (as shown by Stocke+19) but not precise in cases with few (< 5) SDSS galaxies.PI: PROFESSOR EMERITUS John Stocke (PhD 1977, U of Arizona)
PI Stocke has been PI of > 20 previous HST proposals (Cycles 1-28) and has been an author on ~50 publications utilizing HST data.
Recent Usage (Cycles 20-26):
Cosmic Origins Spectrograph Science Team
Cycle 20, GO-13008: Probing Weak Intergalactic Absorption with Flaring Blazer Spectra Cycle 21, GO-13489: Accretion Physics in Nearby FR1 Galaxies
Cycle 23, GO-14277: Probing Hot Gas in Rich Galaxy Groups
Sample of publications resulting from these programs:
Stocke, J., Keeney, B., Danforth, C. et al. 2019, ApJS, 240, 15 (HST Cycle 23 project on massive group gas) Stocke, J.T., Keeney, B.A., Danforth, C.W., Oppenheimer, B.D., Pratt, C.T. \& Berlind, A.A., 2017, ApJ, 838, 37 (HST Cycle 23 project on massive group gas) + 2 other papers on GO-14277
Stocke, J., Keeney, B., Danforth, C. et al. 2014, ApJ, 791, 128
Stocke, J., Keeney, B, Danforth, C. et al. 2013, ApJ, 763, 148
Keeney, B., Stocke, J., Rosenberg, J. et al. 2013, ApJ, 765, 27 + many more refereed papers using HST/COS
Brian Keeney and Benjamin Oppenheimer (Co-Is)
Both were also co-Is on the Cycle 23 HST/COS project on Rich Galaxy Groups. Co-I Keeney supplied ground- based galaxy survey data and analysis including development of a new, sophisticated algorithm for defining and characterizing groups of galaxies; Co-I Oppenheimer supplied theoretical, numerical simulations relevant to these project and will do so on this project as well, should it be approved.
Buell Jannuzi & Chris Impey (Co-Is)
These co-Is are experts in the optical spectroscopy of QSOs and galaxies as well as QSO absorption lines in the optical and UV. They will provide access to the observing facilities of Steward Observatory, University of Arizona, specifically the Hectospec multi-object spectrometer of the MMTO.
Joe Burchett (Co-I)
Prof. Burchett is an expert on UV spectroscopy of QSOs and specializes in those probing dense environments such as galaxy groups. He is also a Commissioning Scientist for the Sloan Digital Sky Survey V and is active in the galaxy groups and clusters working group leveraging both SDSS and eROSITA data. Burchett has led 6 first-author publications that feature HST/COS data.
Romeel Dave (Co-I)
Prof. Dave is an expert in comparing state-of-the-art numerical simulations to absorption-line observations and is the principal investigator of the SIMBA simulations.Intergalactic Medium and the Circumgalactic MediumGalaxies6falsefalsefalsefalsefalsefalsefalseSUPPORTEDGALAXYQSONOThis 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.J2000J2000z=0.512, F(FUV)=6e-15GALAXYQSONOThis 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.J2000J2000z=0.152, F(FUV)=4e-15GALAXYQSONOThis 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.J2000J2000z=0.2542, F(FUV)=4e-15GALAXYQSONOThis 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.J2000J2000z=0.235, F(FUV)=5e-15GALAXYQSONOThis 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.J2000J2000z=0.12, F(FUV)=3e-15GALAXYQSONOThis 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.J2000J2000z=0.46, F(FUV)=3.5e-15COS/FUVSpectroscopicNoNoG130M1222COS/FUVSpectroscopicNoNoG130M1222COS/FUVSpectroscopicNoNoG130M1291COS/FUVSpectroscopicNoNoG130M1291COS/FUVSpectroscopicNoNoG130M1222COS/FUVSpectroscopicNoNoG130M1291/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v01.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "01"
:proposal-version -1
:trans-version "20260618"
:date "14-Aug-2026 15:32:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 183120
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "01"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 2292
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "01"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 2292
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "01"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 2292
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "01"
:orbit-number 4
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 487
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)true40NUV acquisition exposure
COS ETC result for S/N=20; F=2E-15
Count rate 14/sec with MIRRORB.
Nominal exposure time for S/N=20 is 28.2 sec
Round up to 40 sec to be conservativeExposure with FP-POS=3, first orbit
total count rate 140/sec
S/N(orbit)~4.6, S/N(visit)~9.9, S/N(total)~13.0Exposure with FP-POS=3, second orbit
total count rate 140/sec
S/N(orbit)~5.0, S/N(visit)~9.9, S/N(total)~13.0Exposure with FP-POS=3, third orbit
total count rate 140/sec
S/N(orbit)~5.0, S/N(visit)~9.9, S/N(total)~13.0Exposure with FP-POS=4, fourth orbit
total count rate 140/sec
S/N(orbit)~5.0, S/N(visit)~9.9, S/N(total)~13.0/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v02.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "02"
:proposal-version -1
:trans-version "20260618"
:date "14-Aug-2026 15:32:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 139536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "02"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 2292
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "02"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 2292
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "02"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2597
:al-overhead-at-end 0
:internal-dur-at-end 487
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2977
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=2E-15
Count rate 14/sec with MIRRORB.
Nominal exposure time for S/N=20 is 28.2 sec
Round up to 40 sec to be conservativeExposure with FP-POS=3, first orbit
total count rate 140/sec
S/N(orbit)~4.6, S/N(visit)~8.5, S/N(total)~13.0Exposure with FP-POS=4, second orbit
total count rate 140/sec
S/N(orbit)~5.0, S/N(visit)~8.5, S/N(total)~13.0Exposure with FP-POS=4, third orbit
total count rate 140/sec
S/N(orbit)~5.0, S/N(visit)~8.5, S/N(total)~13.0/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v03.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "03"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:07.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 400448
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "03"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "03"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "03"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "03"
:orbit-number 4
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true40NUV acquisition exposure
COS ETC result for S/N=20; F=3E-15
Count rate 19/sec with MIRRORB.
Nominal exposure time for S/N=20 is 20.8 sec
Round up to 30 sec to be conservativeExposure with FP-POS=3, first orbit
total count rate 180/sec
S/N(orbit)~4.1, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=3, second orbit
total count rate 180/sec
S/N(orbit)~4.6, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=4, third orbit
total count rate 180/sec
S/N(orbit)~4.6, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=4, fourth orbit
total count rate 180/sec
S/N(orbit)~4.6, S/N(visit)~9.0, S/N(total)~12.7/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v04.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "04"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:08.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 400448
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "04"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "04"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "04"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "04"
:orbit-number 4
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true40NUV acquisition exposure
COS ETC result for S/N=20; F=3E-15
Count rate 19/sec with MIRRORB.
Nominal exposure time for S/N=20 is 20.8 sec
Round up to 30 sec to be conservativeExposure with FP-POS=1, first orbit
total count rate 180/sec
S/N(orbit)~4.1, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=1, second orbit
total count rate 180/sec
S/N(orbit)~4.6, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=2, third orbit
total count rate 180/sec
S/N(orbit)~4.6, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=2, fourth orbit
total count rate 180/sec
S/N(orbit)~4.6, S/N(visit)~9.0, S/N(total)~12.7/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v05.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "05"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:09.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 304704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "05"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "05"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "05"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=6E-15
Count rate 43/sec with MIRRORB.
Nominal exposure time for S/N=20 is 9.3 sec
Round up to 15 sec to be conservativeExposure with FP-POS=1, first orbit
total count rate 201/sec
S/N(orbit)~3.7, S/N(visit)~6.8, S/N(total)~11.8Exposure with FP-POS=2, second orbit
total count rate 201/sec
S/N(orbit)~4.1, S/N(visit)~6.8, S/N(total)~11.8Exposure with FP-POS=2, third orbit
total count rate 201/sec
S/N(orbit)~4.1, S/N(visit)~6.8, S/N(total)~11.8/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v06.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "06"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:10.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 304704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "06"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "06"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "06"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=6E-15
Count rate 43/sec with MIRRORB.
Nominal exposure time for S/N=20 is 9.3 sec
Round up to 15 sec to be conservativeExposure with FP-POS=1, first orbit
total count rate 201/sec
S/N(orbit)~3.7, S/N(visit)~6.8, S/N(total)~11.8Exposure with FP-POS=3, second orbit
total count rate 201/sec
S/N(orbit)~4.1, S/N(visit)~6.8, S/N(total)~11.8Exposure with FP-POS=3, third orbit
total count rate 201/sec
S/N(orbit)~4.1, S/N(visit)~6.8, S/N(total)~11.8/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v07.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "07"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:10.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 304704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "07"
:obset-id "07"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "07"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "07"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "07"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=6E-15
Count rate 43/sec with MIRRORB.
Nominal exposure time for S/N=20 is 9.3 sec
Round up to 15 sec to be conservativeExposure with FP-POS=1, first orbit
total count rate 201/sec
S/N(orbit)~3.7, S/N(visit)~6.8, S/N(total)~11.8Exposure with FP-POS=4, second orbit
total count rate 201/sec
S/N(orbit)~4.1, S/N(visit)~6.8, S/N(total)~11.8Exposure with FP-POS=4, third orbit
total count rate 201/sec
S/N(orbit)~4.1, S/N(visit)~6.8, S/N(total)~11.8/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v08.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "08"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:11.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 304704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "08"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 2268
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "08"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 2268
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "08"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; flat continuum with GALEX NUV = 17.56
Count rate 21/sec with MIRRORB.
Nominal exposure time for S/N=20 is 18.9 sec
Rounded up to 30 sec to be conservativeExposure with FP-POS=1, first orbit
total count rate 194/sec
S/N(orbit)~4.6, S/N(visit)~8.7, S/N(total)~12.3Exposure with FP-POS=1, second orbit
total count rate 194/sec
S/N(orbit)~5.2, S/N(visit)~8.7, S/N(total)~12.3Exposure with FP-POS=2, third orbit
total count rate 194/sec
S/N(orbit)~5.2, S/N(visit)~8.7, S/N(total)~12.3/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v09.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "09"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 304704
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "09"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 2268
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "09"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 2268
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "09"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2621
:al-overhead-at-end 0
:internal-dur-at-end 556
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; flat continuum with GALEX NUV = 17.56
Count rate 21/sec with MIRRORB.
Nominal exposure time for S/N=20 is 18.9 sec
Rounded up to 30 sec to be conservativeExposure with FP-POS=2, first orbit
total count rate 194/sec
S/N(orbit)~4.6, S/N(visit)~8.7, S/N(total)~12.3Exposure with FP-POS=3, second orbit
total count rate 194/sec
S/N(orbit)~5.2, S/N(visit)~8.7, S/N(total)~12.3Exposure with FP-POS=4, third orbit
total count rate 194/sec
S/N(orbit)~5.2, S/N(visit)~8.7, S/N(total)~12.3/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v10.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "10"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 139536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "10"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "10"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "10"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 487
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=5E-15
Count rate 36/sec with MIRRORB.
Nominal exposure time for S/N=20 is 11.2 sec
Round up to 15 sec to be conservativeExposure with FP-POS=3, first orbit
total count rate 148/sec
S/N(orbit)~4.9, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=3, second orbit
total count rate 148/sec
S/N(orbit)~5.3, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=4, third orbit
total count rate 148/sec
S/N(orbit)~5.3, S/N(visit)~9.0, S/N(total)~12.7/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v11.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "11"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:13.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 139536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "11"
:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "11"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "11"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 2290
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "11"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2599
:al-overhead-at-end 0
:internal-dur-at-end 487
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=5E-15
Count rate 36/sec with MIRRORB.
Nominal exposure time for S/N=20 is 11.2 sec
Round up to 15 sec to be conservativeExposure with FP-POS=4, first orbit
total count rate 148/sec
S/N(orbit)~4.9, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=4, second orbit
total count rate 148/sec
S/N(orbit)~5.3, S/N(visit)~9.0, S/N(total)~12.7Exposure with FP-POS=3, third orbit
total count rate 148/sec
S/N(orbit)~5.3, S/N(visit)~9.0, S/N(total)~12.7/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v12.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "12"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:14.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 139536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "12"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 2295
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "12"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 2295
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "12"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 487
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=3.5E-15
Count rate 25/sec with MIRRORB.
Nominal exposure time for S/N=20 is 16.0 sec
Round up to 20 sec to be conservativeExposure with FP-POS=3, first orbit
total count rate 142/sec
S/N(orbit)~5.0, S/N(visit)~9.2, S/N(total)~13.1Exposure with FP-POS=3, second orbit
total count rate 142/sec
S/N(orbit)~5.5, S/N(visit)~9.2, S/N(total)~13.1Exposure with FP-POS=4, third orbit
total count rate 142/sec
S/N(orbit)~5.5, S/N(visit)~9.2, S/N(total)~13.1/Users/keeney/Documents/HST/cycle34/PhaseII/OP-cache/igrm_cy34-v13.xmlThe scheduling data was generated by CASM 34.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 18429
:visit-id "13"
:proposal-version -1
:trans-version "20260618"
:date "17-Aug-2026 11:35:15.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 139536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18429
:visit-id "13"
:obset-id "13"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18429
:visit-id "13"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 2295
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "13"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 2295
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18429
:visit-id "13"
:orbit-number 3
:pcs-time 380
:si-vis-utilization 2594
:al-overhead-at-end 0
:internal-dur-at-end 487
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2974
:pcs-gap 0
)true30NUV acquisition exposure
COS ETC result for S/N=20; F=3.5E-15
Count rate 25/sec with MIRRORB.
Nominal exposure time for S/N=20 is 16.0 sec
Round up to 20 sec to be conservativeExposure with FP-POS=4, first orbit
total count rate 142/sec
S/N(orbit)~5.0, S/N(visit)~9.2, S/N(total)~13.1Exposure with FP-POS=4, second orbit
total count rate 142/sec
S/N(orbit)~5.5, S/N(visit)~9.2, S/N(total)~13.1Exposure with FP-POS=3, third orbit
total count rate 142/sec
S/N(orbit)~5.5, S/N(visit)~9.2, S/N(total)~13.1