With ACS/HRC coronagraphy, we have achieved the direct detection of a planet candidate in F606W and F814W around a bright nearby star with a debris belt. The planet candidate, Fomalhaut b, lies 18 astronomical units interior to the dust belt and we detect counterclockwise orbital motion in observations separated by 1.75 years. The candidate has mass no greater than three Jupiter masses based on an analysis of its luminosity and the dynamical argument that a significantly more massive object would disrupt the dust belt. Using recent model predictions for 100-300 Myr old planetary atmospheres, the planet candidate has a temperature of ~400 K and a mass 1.6 - 3.4 M_J. Variability at optical wavelengths suggests additional sources of luminosity such as H-alpha emission or the episodic accretion of cometary material. Here we propose follow-up observations with HST/STIS c oronagraphy. We employ an observing strategy that is identical to the one used for the detection using ACS/HRC coronagraphy. The key goal is recovery of Fomalhaut b in a third epoch that will also provide crucial astrometric information to determine its orbit. From the new orbit estimate and models of dynamical interactions with the surrounding debris belt, we aim to further constrain the mass of Fomalhaut b and the evolutionary history of the system.

The purpose of Program DD 11818 is to detect the planet candidate Fomalhaut b first discovered with the ACS/HRC. DD 11818 was initially awarded time with NICMOS, and then with WFC3/IR. The NICMOS observations suffered from an error in pointing, whereas the WFC3/IR data were shown to have sever scattering and diffraction artifacts at the radius and location where we expected to image Fomalhaut b. In January 2010, we proposed to attempt the program with STIS/Coronagraphy, since Fomalhaut b was originally detected at optical wavelengths and does not appear to be as luminous at infrared wavelengths as planet atmosphere models predict. With STIS we will use the strategy that succeeded with ACS. We will use three ORIENTS with the star Fomalhaut behind one occulting mask position, and then repeat the three ORIENTS at a different mask position. Here we have selected BAR10 and WEDGEB2.5 as the two positions. The total program comprises six orbits, with three orbits at each occulting position. The observations should be executed close in time to minimize PSF breathing residuals. The three orbits for each occulting position should be consecutive orbits, as specified in a GROUP WITHIN constraint. We filed a PCR for Visits 09-12 to use WFC3. The WFC3 observations were successfully executed, but the data revealed that the F110W filter has significant ghosting artifacts at ~13 arcsec radius in an azimuthal orientation that were essentially impossible to completely remove using roll deconvolution. Fomalhaut b was not detected behind these significant ghosts. We decided that even though we could change the roll orientation in future observations to avoid the ghosting artifacts in WFC3/IR, we could also repeat the experiment with STIS coronagraphy, which is better characterized by existing observations of Beta Pictoris. In Visits 13-18 we employ the dither and roll strategy with STIS that previously yielded the ACS/HRC detection. We acquire Fomalhaut behind WEDGEB2.5 and BAR10, and roll to three angles at each of these two occulted positions. Absolute ORIENTs are specified to safely avoid the saturation columns and diffraction spikes. No PSF reference star is observed since Fomalhaut will act as PSF reference for itself using roll deconvolution (angular differential imaging). Visits 19,20,21,22 are four orbits awarded again for STIS observations from a HOPR filed concerning a problem with Visits 13-18 with STIS. EXTRA-SOLAR PLANETS 0 false 0.0 0.0 false false false false false false SUPPORTED STAR A0-A3 V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 22 57 39.0465 -29 37 20.05 J2000 STAR A0-A3 V-IV This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 22 57 39.0465 -29 37 20.05 J2000 NIC1 Imaging No No F110W NIC1 Imaging No No F110W NIC1 Imaging No No F110W NIC1 Imaging No No F110W NIC1 Imaging No No F110W NIC1 Imaging No No F110W Timing link suitability includes constraints ([Group (05 06 07 08) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1220882004000 12.0 (Tic-Visit :proposal-id 11818 :visit-id "05" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:27.0" :trans-errors '(:WARNINGS 3 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 113744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "05" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 60 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (05 06 07 08) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1220887757000 16.0 (Tic-Visit :proposal-id 11818 :visit-id "06" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:28.0" :trans-errors '(:WARNINGS 3 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 113744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "06" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 60 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (05 06 07 08) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1220893511000 20.0 (Tic-Visit :proposal-id 11818 :visit-id "07" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:29.0" :trans-errors '(:WARNINGS 3 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 113744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "07" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 60 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (05 06 07 08) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1220899264000 24.0 (Tic-Visit :proposal-id 11818 :visit-id "08" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:31.0" :trans-errors '(:WARNINGS 3 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "23" :si-bright-earth-limb-angle 20.0 :data-volume 113744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "08" :orbit-number 1 :pcs-time 269 :si-vis-utilization 2661 :al-overhead-at-end 0 :internal-dur-at-end 60 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (09 10 11 12) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1258376421000 55.0 (Tic-Visit :proposal-id 11818 :visit-id "09" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1647216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "09" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2343 :al-overhead-at-end 0 :internal-dur-at-end 711 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (09 10 11 12) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1258382173000 60.0 (Tic-Visit :proposal-id 11818 :visit-id "10" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1647216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "10" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2343 :al-overhead-at-end 0 :internal-dur-at-end 711 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (09 10 11 12) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1258387925000 65.0 (Tic-Visit :proposal-id 11818 :visit-id "11" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:37.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1647216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "11" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2343 :al-overhead-at-end 0 :internal-dur-at-end 711 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (09 10 11 12) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1258393677000 70.0 (Tic-Visit :proposal-id 11818 :visit-id "12" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1647216 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "12" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2343 :al-overhead-at-end 0 :internal-dur-at-end 711 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (13 14 15) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1276462071000 240.10000000000008 (Tic-Visit :proposal-id 11818 :visit-id "13" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:40.0" :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 129232 :tdrss-contact-duration 0 :coron T ) (Tic-Obset :proposal-id 11818 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "13" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 998 :low-sky "N" :pcs-visibility 1239 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (13 14 15) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1276460387000 253.0 (Tic-Visit :proposal-id 11818 :visit-id "14" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:41.0" :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 129232 :tdrss-contact-duration 0 :coron T ) (Tic-Obset :proposal-id 11818 :visit-id "14" :obset-id "14" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "14" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 998 :low-sky "N" :pcs-visibility 1239 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (13 14 15) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1276466199000 266.0 (Tic-Visit :proposal-id 11818 :visit-id "15" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:42.0" :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 129232 :tdrss-contact-duration 0 :coron T ) (Tic-Obset :proposal-id 11818 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "15" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 998 :low-sky "N" :pcs-visibility 1239 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (16 17 18) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1276535211000 240.10000000000008 (Tic-Visit :proposal-id 11818 :visit-id "16" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:43.0" :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 129232 :tdrss-contact-duration 0 :coron T ) (Tic-Obset :proposal-id 11818 :visit-id "16" :obset-id "16" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "16" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 998 :low-sky "N" :pcs-visibility 1239 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (16 17 18) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1276536896000 253.06383453912747 (Tic-Visit :proposal-id 11818 :visit-id "17" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:43.0" :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 129232 :tdrss-contact-duration 0 :coron T ) (Tic-Obset :proposal-id 11818 :visit-id "17" :obset-id "17" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "17" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 998 :low-sky "N" :pcs-visibility 1239 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (16 17 18) Within 0.2 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 1276540967000 266.0 (Tic-Visit :proposal-id 11818 :visit-id "18" :proposal-version -1 :trans-version "20100505" :date "03-Aug-2010 15:43:44.0" :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 129232 :tdrss-contact-duration 0 :coron T ) (Tic-Obset :proposal-id 11818 :visit-id "18" :obset-id "18" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "18" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2797 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 998 :low-sky "N" :pcs-visibility 1239 :pcs-gap 0 ) false 1 0 Timing link suitability includes constraints ([Group (19 20 21 22) Within 0.3 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. Visits 19-22 are STIS orbits for coronagraphy on Fomalhaut awarded by HOPR. (Tic-Visit :proposal-id 11818 :visit-id "19" :proposal-version -1 :trans-version "20100505" :date "06-Aug-2010 16:23:06.0" :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 460496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "19" :obset-id "19" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "19" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2764 :al-overhead-at-end 0 :internal-dur-at-end 381 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (19 20 21 22) Within 0.3 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. Visits 19-22 are STIS orbits for coronagraphy on Fomalhaut awarded by HOPR. (Tic-Visit :proposal-id 11818 :visit-id "20" :proposal-version -1 :trans-version "20100505" :date "06-Aug-2010 16:23:20.0" :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 460496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "20" :obset-id "20" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "20" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2764 :al-overhead-at-end 0 :internal-dur-at-end 381 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (19 20 21 22) Within 0.3 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. Visits 19-22 are STIS orbits for coronagraphy on Fomalhaut awarded by HOPR. (Tic-Visit :proposal-id 11818 :visit-id "21" :proposal-version -1 :trans-version "20100505" :date "06-Aug-2010 16:23:33.0" :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 460496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "21" :obset-id "21" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "21" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2764 :al-overhead-at-end 0 :internal-dur-at-end 381 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (19 20 21 22) Within 0.3 days]) The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. Visits 19-22 are STIS orbits for coronagraphy on Fomalhaut awarded by HOPR. (Tic-Visit :proposal-id 11818 :visit-id "22" :proposal-version -1 :trans-version "20100505" :date "06-Aug-2010 16:23:41.0" :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 460496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11818 :visit-id "22" :obset-id "22" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11818 :visit-id "22" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2764 :al-overhead-at-end 0 :internal-dur-at-end 381 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3141 :pcs-gap 0 ) true 1 0