0 The aperture under WAVECAL of each target star has been updated. -1426940104 ----- Attempting Submission 1 (Thu Jul 14 02:35:10 GMT 2022) ----- ----- Attempting Submission 2 (Mon Sep 05 12:52:29 GMT 2022) ----- ----- Attempting Submission 3 (Tue Sep 20 15:43:19 GMT 2022) ----- The Missing Link in Massive Binary Star Evolution Binaries are common among massive stars, and close pairs interact over their lifetime to transform the binary systems through the exchange of mass and angular momentum. The gainer star is spun up to near critical rotational velocity and the donor star is stripped of its outer envelope to reveal a hot and faint helium star. The detection of these faint helium stars is feasible using ultraviolet spectroscopy. Determining the orbital and physical properties of the helium stars is important to trace the evolutionary state of post-mass transfer binaries. Massive helium stars are the probable progenitors of neutron stars and black holes in X-ray binaries. Recent HST observations led to the detection of ten sdO stars in Be binaries and to estimates of their radii and effective temperatures. Five of the southern sky targets were not known binaries before the HST program, and a three-year program of optical spectroscopy reveals that they have very long periods that are only partially sampled in the existing HST data. Here we propose to revisit these five targets and obtain HST/STIS FUV spectroscopy to cover the full range of orbital Doppler shifts. This information will lead to the determination of the orbital and physical properties of the stars. The individual spectral components will be reconstructed using Doppler tomography to investigate the abundances and element diffusion processes in the helium stars. In order to determine the atmospheric and physical properties of the Be+sdO binary systems, here we request an allocation of 15 orbits for high dispersion UV spectroscopy of five southern Be binaries that host a hot, evolved He companion star. We will use HST/STIS with the E140M grating and the MAMA detector (FUV-MAMA). The observations will cover the FUV regime in the range of $1150-1710$ Angstroms with a resolving power of R=45,800. For each visit, four consecutive exposures will be included. These include the exposures for the STIS target acquisition (ACQ), target peak-up (ACQ/PEAK), STIS science exposure (ACCUM), and also observer-specified wavelength calibration exposure (ACCUM-WAVE) for the selected STIS/FUV-MAMA configuration. We used the STIS exposure time calculator (ETC) to estimate the time needed for exposures in each proposed visit, and we compared these with prior successful observations of the same targets. Because all the targets are bright in the UV, we selected the F25ND5 aperture and utilized the Castelli-Kurucz Models accordingly to the spectral type of target stars to determine the exposure time for the point source to achieve an S/N ratio of 40 for target acquisition. Extinction values E(B-V) were collected from Wang et al. (2021), and V magnitudes obtained from the SIMBAD were used to normalize the target flux. Standard average normalization values for the zodiacal light, earth shine light, and air glow were assumed throughout the calculation. Because all the selected apertures for science observations have dimensions less than 1 arcsec, we request target peak-up for each visit by using the 0.3X0.05ND aperture. All five targets have prior FUV observations obtained in Cycle 26 (HST Program GO-15659) by Wang et al. (2021). We thus utilized the existing STIS spectra to specify the spectral energy distribution of the target stars. All the targets have 54 to 60 minutes of visibility in each orbit. By subtracting 6 minutes for guide star acquisition, 6 minutes for STIS target acquisition, 8 minutes for target peak-up, and 3 minutes for STIS science overhead observations, there remains about 31 minutes (1860 seconds) of science exposure time in one orbit. Following the strategy of achieving an S/N > 40 per resolution element at 1425 Angstroms for successful detection of the sdO star in the system from the prior study in Cycle 26, we used the ETC to determine the expected S/N for each target for the integration time available in one orbit. A neutral density filter is needed to avoid the photon counts exceeding the bright limit of the MAMA detector. One of the major goals of this study is to sample the observations of the five Be+sdO binary systems to complete the full coverage of their orbital motion. The existing FUV spectra from Wang et al. (2021) display a small range of the Doppler shifts and comprise only a partial fraction of the orbital motion. In order to schedule the observations at times corresponding to the missing orbital phases and Doppler shifts and also to avoid coinciding with prior IUE and STIS FUV observations, we adopted the derived orbital period and the epoch at zero phases from the three-year program of optical spectroscopy of Wang et al. (2022, private communication) to constrain the timing requirement for the three visits of each target. We set the PERIOD and ZERO-PHASE constraints under each visit and link the PHASE constraint to the first exposure of each visit. By allocating three additional FUV observations, we will be able to measure the RVs for each component and combine these with the existing measurements to complete the orbit coverage to determine the orbital parameters of the Be+sdO binaries. Throughout Cycle 30, uncertainty in the gyro lifetime may result in the proposed observations being observed in reduced gyro mode (RGM). The reduced field of regard and the observing window will lower the range of dates that can be scheduled for our observations. Otherwise, the program is not adversely affected by RGM limitations. Our science goals are to measure the radial velocities of the Be star and hot companion star from a cross-correlation analysis with non-LTE TLUSTY model spectra. By combining the new results with existing measurements from both FUV and ground-based optical spectroscopy, the orbital solutions and the mass ratio can be determined. Consequently, based upon the estimation of Be star mass from optical spectroscopy and the derived orbital mass products, we will arrive at the mass of the sdO star. The derived orbital solutions will be used to reconstruct the individual spectra of the binary components using Doppler tomography. We will determine the companion's atmospheric abundances and stellar wind properties through the model fitting to the reconstructed spectral components. Ultimately, these results will enable a direct comparison to evolutionary tracks to trace the formation processes of Be+sdO binary systems. Dr. Douglas Gies is a long-time practitioner studying massive binary stars, and he has led several HST investigations of spectroscopic binaries. Dr. Luqian Wang has experience analyzing the Be+He binaries using both ground-based and space UV spectroscopy. Dr. Geraldine Peters is an expert in space observations of hot stars and has led many important investigations on the Be binaries. Dr. Robert Klement has expertise in observing and analyzing the Be binaries using near IR interferometric and radio data. Stellar Physics and Stellar Types 6 false false false false false false false SUPPORTED STAR B0-B2 V-IV BE EMISSION LINE STAR INTERACTING BINARY NO This object was generated by the targetselector and retrieved from the SIMBAD and Gaia DR3 database. LS-MUS HR-4930 J2000 J2000 STAR B0-B2 V-IV BE EMISSION LINE STAR INTERACTING BINARY NO This object was generated by the targetselector and retrieved from the SIMBAD and Gaia DR3 database. -KAP01-APS HR5730 J2000 J2000 STAR B3-B5 V-IV BE EMISSION LINE STAR INTERACTING BINARY NO This object was generated by the targetselector and retrieved from the SIMBAD and Gaia DR3 database. V846-ARA HR6274 J2000 J2000 STAR B0-B2 V-IV BE EMISSION LINE STAR INTERACTING BINARY NO This object was generated by the targetselector and retrieved from the SIMBAD and Gaia DR3 database. IOT-ARA HR6451 J2000 J2000 STAR B0-B2 V-IV BE EMISSION LINE STAR INTERACTING BINARY This object was generated by the targetselector and retrieved from the SIMBAD and Gaia DR3 database. V750-ARA MWC259 J2000 J2000 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 STIS/FUV-MAMA Spectroscopic No No E140M 1425 /Users/luqian/Downloads/OP-cache/Untitled-v01.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "01" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:24:18.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3132 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v02.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "02" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:25:06.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3132 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v03.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "03" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:25:52.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3132 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v04.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "04" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:26:40.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "04" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3132 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v05.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "05" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:27:32.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "05" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3131 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v06.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "06" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:28:21.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "06" :orbit-number 1 :pcs-time 393 :si-vis-utilization 3131 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v07.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "07" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:29:10.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "07" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2939 :al-overhead-at-end 245 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 1 0 In Earth shadow /Users/luqian/Downloads/OP-cache/Untitled-v08.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17095 :visit-id "08" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:30:04.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "08" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2939 :al-overhead-at-end 245 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v09.xml (Tic-Visit :proposal-id 17095 :visit-id "09" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:30:51.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "09" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2939 :al-overhead-at-end 245 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v10.xml (Tic-Visit :proposal-id 17095 :visit-id "10" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:31:41.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "10" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2892 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v11.xml (Tic-Visit :proposal-id 17095 :visit-id "11" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:32:31.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "11" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2892 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v12.xml (Tic-Visit :proposal-id 17095 :visit-id "12" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:33:19.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "12" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2892 :al-overhead-at-end 227 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v13.xml (Tic-Visit :proposal-id 17095 :visit-id "13" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:34:11.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "13" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2891 :al-overhead-at-end 245 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v14.xml (Tic-Visit :proposal-id 17095 :visit-id "14" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:35:08.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "14" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2891 :al-overhead-at-end 245 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 In Earth shadow The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/luqian/Downloads/OP-cache/Untitled-v15.xml (Tic-Visit :proposal-id 17095 :visit-id "15" :proposal-version -1 :trans-version "20220516" :date "20-Sep-2022 22:35:56.0" :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 87536 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17095 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17095 :visit-id "15" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2891 :al-overhead-at-end 245 :internal-dur-at-end 319 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3285 :pcs-gap 0 ) true 1 0 In Earth shadow