Our past HST studies of the temperatures of 9 accreting, pulsating white dwarfs in cataclysmic variables show that 3 are in the normal instability strip for single white dwarfs, but the other 6 are much hotter (15,000-16,500K). This dual strip has been proposed to be due to mass differences in the white dwarfs related to evolutionary history and driven by the ionization of different elements in their respective driving regions. In 2007, GW Lib (the brightest and best studied of the 6 hot accreting pulsators) and V455 And (the brightest and best studied of the 3 cool accreting pulsators) underwent rare large amplitude dwarf nova outbursts (known to heat the white dwarf) and their pulsations disappeared. We propose COS observations to: a) take advantage of the unprecedented opportunity to view the change in pulsation modes due to cooling of the white dwarf envelope and b) determine the masses of the white dwarfs to test the dual strip theory. In addition, a nova that had its outburst 22 yrs ago has begun non-radial pulsations as it returns to quiescence. We will use COS to determine its temperature in relation to the instability strip for the pulsating white dwarfs in dwarf novae.

Our goals are to obtain both time-resolved coverage in order to construct radial velocity and UV light curves, as well as to obtain a summed spectrum with sufficient S/N to allow a temperature fit with models. Thus, the number of orbits is driven by the need to sufficiently cover the binary orbits and a long enough baseline to identify the pulsation frequencies, and (almost) independent of the brightness of the target. Since the number of contiguous HST orbits is limited to 5, we plan to use 4 orbits each with COS and G160M for optimum coverage of the binary orbits of GW Lib and V455 And and a fifth orbit on each with COS with G140L to increase the wavelength coverage for the temperature modeling. For V482 Cen, we will only use one orbit with G140L for temperature determination. We used Hubeny's (1988) TLUSTY/SYNSPEC codes to calculate white dwarf model spectra adopting the temperatures that we estimate will be found during Cycle 17 observations, i.e. 12500K for V445 And and 17500K for GW Lib, log g=8, 0.1 times solar abundances, and the scaling factors (=distances) found from our model fits to the quiescent STIS spectra. These model spectra were then uploaded to the COS ETC to calculate the signal-to-noise ratio achieved over 1/10th of the orbital period. The data will be taken in the TIME-TAG mode, so can be phase-binned during the reduction, and our experience shows that we need orbital phase bins of less than or equal to 0.1 to prevent orbital smearing of the radial velocities. Using the ETC for COS with G160M centered at 1577A, and the predicted flux for V455 And shown in Figure 1, we find that we will achieve a S/N of 10 in a 480s exposure binning by 4. This will allow a resolution of about 5000, providing 60km/s per resolution element. We can measure radial velocities to about 1/10 resolution element so we should easily be able to obtain a good value for K1. Even though the secondaries are not seen, at outburst the secondary is irradiated and produces narrow Balmer emission lines that we are measuring to provide K2 values. The grazing eclipse in V455 And provides a high inclination (near 77 deg) and the width of the lines in GW Lib gives and estimate of 11 deg. Thus, the information is available to determine masses with K1 values. For V455 And, we can also measure the rotation velocity of the white dwarf from the broadening of the absorption lines to confirm that the 67 sec period seen in the optical is indeed the white dwarf rotation period. The S/N values for GW Lib should be even higher as it is hotter. For the G140L grating (setting 1105), we can achieve S/N>20 at a resolution of 2500-3000 in one orbit for V455 And and better for GW Lib, depending on the actual temperatures found. V482 Cen is expected to be hotter still, so its result should have the best S/N in one orbit. Our past observations of GW Lib (and the other pulsators) with STIS (and SBC) showed that we could easily pick up the pulsations in a baseline of 5 orbits. The better S/N of COS will allow us to do this in 4 orbits, the same 4 orbits that are used to cover the binary orbit using the SiII and CI lines to determine the velocity curves. Our 3 past years of observations of the 9 objects so far have successfully used ground-based coverage prior to and during the HST observations to insure that the objects are close to quiescence. Given that the recurrence timescales for GW Lib and V455 And are 20-30 yrs and they just had an outburst, the odds of them having another outburst in the next year are very close to zero (the odds for V842 Cen are even more remote as it was a nova). However, we anticipate using our access to APO, Sutherland and the AAVSO network to monitor the brightness states and the amplitudes of the optical pulsations as in the past work. HOT STARS 12 false 0.0 0.0 false false false false false false AVAILABLE STAR DWARF NOVA This object is in the GSC2 catalog but published ICRS coords and pm by Thorstensen (2003) are used. F-CONT(1500)=5.8E-15,F-LINE(1550)=9E-15,W-LINE(1550)=6 S90M004717 J2000 15 19 55.4500 -25 00 25.30 J2000 STAR DWARF NOVA Object is in GSC2 catalog but coords and pm from published values by Thorstensen in Araujo-Betancor et al. 2005. F-CONT(1700)=4.0E-15,F-LINE(1550)=1.9E-14,W-LINE(1550)=13 N08R007461 J2000 23 34 1.6000 +39 21 41.40 J2000 STAR CLASSICAL NOVA GSC2 coords and pm but distance of nova is near 1 kpc E(B-V)=0.55 S7M1013716 J2000 14 35 52.5500 -57 37 35.30 J2000 UNIDENTIFIED BLANK FIELD This target is a blank piece of sky which is the bright object safe pointing and is 9.0 arcseconds away at a PA 18.0 degrees from Target #1. 00 00 0.0000 +00 00 0.00 J2000 UNIDENTIFIED BLANK FIELD This target is a blank piece of sky which is the bright object safe pointing and is 9.0 arcseconds away at a PA 44.8 degrees from Target #3. 00 00 0.0000 +00 00 0.00 J2000 UNIDENTIFIED BLANK FIELD This target is a blank piece of sky which is the bright object safe pointing and is 9.8 arcseconds away at a PA 343.8 degrees from Target #2. 23 34 1.6000 +39 21 41.40 J2000 COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G140L 1105 COS/FUV Spectroscopic No No G160M 1577 COS/FUV Spectroscopic No No G140L 1105 COS/FUV Spectroscopic No No G140L 1105 Timing link suitability includes constraints ([01 After 1A by at least 3.0 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. Ground-based observations will be used to ensure object is at quiescence. 1268279240000 289.0 (Tic-Visit :proposal-id 11639 :visit-id "01" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:08:42.0" :trans-errors '(:WARNINGS 5 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 391440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2967 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 416 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) false 5 5 Timing link suitability includes constraints ([01 After 1A by at least 3.0 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit allocates and sets up the safe position offset slot for visit 01 which will use that slot. 1268009712000 289.0 (Tic-Visit :proposal-id 11639 :visit-id "1A" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:08:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "1A" :obset-id "1A" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "1A" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit is for BOP checking the "safe" target only and should not execute onboard HST. (Tic-Visit :proposal-id 11639 :visit-id "1B" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:08:44.0" :trans-errors '(:WARNINGS 5 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 391440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "1B" :obset-id "1B" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "1B" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3010 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "1B" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "1B" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "1B" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 416 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "1B" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3070 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3257 :pcs-gap 0 ) true 5 5 Timing link suitability includes constraints ([02 After 2A by at least 3.0 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. Ground-based observations will be used to ensure object is at quiescence. 1284188142000 188.8 (Tic-Visit :proposal-id 11639 :visit-id "02" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:02:42.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 408832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2929 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 416 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 5 0 Timing link suitability includes constraints ([02 After 2A by at least 3.0 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit allocates and sets up the safe position offset slot for visit 02 which will use that slot. 1283129179000 188.8 (Tic-Visit :proposal-id 11639 :visit-id "2A" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:05:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "2A" :obset-id "2A" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "2A" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit is for BOP checking the "safe" target only and should not execute onboard HST. (Tic-Visit :proposal-id 11639 :visit-id "2B" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 14:46:04.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 408832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "2B" :obset-id "2B" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "2B" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2929 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "2B" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "2B" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "2B" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 416 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "2B" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) true 5 0 Timing link suitability includes constraints ([03 After 3A by at least 3.0 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1268929516000 314.8 (Tic-Visit :proposal-id 11639 :visit-id "03" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:08:46.0" :trans-errors '(:WARNINGS 1 :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 78352 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3260 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) false 1 1 Timing link suitability includes constraints ([03 After 3A by at least 3.0 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit allocates and sets up the safe position offset slot for visit 03 which will use that slot. 1268613228000 314.8 (Tic-Visit :proposal-id 11639 :visit-id "3A" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:08:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "3A" :obset-id "3A" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "3A" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. This visit is for BOP checking the "safe" target only and should not execute onboard HST. (Tic-Visit :proposal-id 11639 :visit-id "3B" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:08:56.0" :trans-errors '(:WARNINGS 1 :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 78352 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "3B" :obset-id "3B" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "3B" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3260 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) true 1 1 This visit allocates and sets up the safe position offset slot for visit 05 which will use that slot. (Tic-Visit :proposal-id 11639 :visit-id "2A" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:05:18.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "11" :si-bright-earth-limb-angle 20.0 :data-volume 0 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "2A" :obset-id "2A" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "2A" :orbit-number 1 :pcs-time 333 :si-vis-utilization 5 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 1 0 Ground-based observations will be used to ensure object is at quiescence. This visit is a repeat of failed visit 02. (Tic-Visit :proposal-id 11639 :visit-id "02" :proposal-version -1 :trans-version "20100505" :date "19-Jul-2010 15:02:42.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 408832 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11639 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2929 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 116 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 416 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11639 :visit-id "02" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3079 :al-overhead-at-end 0 :internal-dur-at-end 428 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3301 :pcs-gap 0 ) false 5 0