!TRANSFORMATION VERSION DEVELOP 85.0 !Converted RPS2 File /blofeld/data1/blacker/5452.new !GENERATED 9-21-1995 14:53:09 !PROPOSAL 5452 VERSION C !TRANSFORMED USING PROCON ! Command line parameters: :run-trans 5452 C :phase :procon :input "/blofeld/data1/blacker/" :output "/blofeld/data1/blacker/" Proposal_Information Title: COMPOSITION OF DARK MATERIAL ON IAPETUS CYCLE4 - MEDIUM Proposal_Category: GO Scientific_Category: SOLAR SYSTEM,SATELLITES Cycle: 4 Investigators PI_name: NOLL, KEITH PI_Institution: STSCI CoI_Name: Pendleton, Yvonne DR. CoI_Institution: 2852 CoI_Name: Roush, Theodore DR. CoI_Institution: 1630 CoI_Name: Cruikshank, Dale DR. CoI_Institution: 2852 Questions Observing_Description: Real_Time_Justification: Calibration_Justification: Additional_Comments: Abstract: The chemical identity of dark material in the solar system, both on planetary surfaces and in clouds is a longstanding question. Hypotheses have focussed on organic material produced either in situ, or transported from other bodies through impacts. The laboratory experiments of Khare, Sagan and others have identified a class of complex hydrocarbons that appear to have some of the characteristics appropriate to at least some of the dark matter observed in the solar system. We propose to further the study of organic matter in the solar system by recording the first UV spectra of Iapetus at wavelengths from 1800 to 2600 A, and vastly improve on the S/N of spectra from 2600 to 3300 A. Reflection spectra produced from optical constants of at least one candidate organic material, tholins show structure over this portion of the spectrum that may be identifiable in the dark hemisphere spectrum and help identify the chemical composition of this compared to the presumably ice-dominated bright hemisphere of Iapetus and a control spectrum of another icy Saturn satellite, Rhea. Fixed_Targets Solar_System_Targets Target_Number: 1 Target_Name: IAPETUS-DARK Description: SATELLITE IAPETUS Level_1: STD = SATURN Level_2: STD = IAPETUS Level_3: Window: OLG OF IAPETUS BETWEEN 88 92 Flux: V = 11.1 +/- 1.2, F-CONT(2200.0) = 19.0 +/- 5.0 E-17, F-CONT(1800.0) = 17.0 +/- 5.0 E-18 Comments: DARK HEMISPHERE OF IAPETUS, MUST MAINTAIN NARROW WINDOW Target_Number: 2 Target_Name: IAPETUS-BRIGHT Description: SATELLITE IAPETUS Level_1: STD = SATURN Level_2: STD = IAPETUS Level_3: Window: OLG OF IAPETUS BETWEEN 265 275 Flux: V = 11.1 +/- 1.2, F-CONT(2200.0) = 14.0 +/- 5.0 E-16, F-CONT(1800.0) = 12.0 +/- 5.0 E-17 Comments: BRIGHT HEMISPHERE OF IAPETUS WINDOW IS LESS TIGHT Target_Number: 3 Target_Name: RHEA Description: SATELLITE RHEA Level_1: STD = SATURN Level_2: STD = RHEA Level_3: Window: SEP OF SATURN RHEA FROM EARTH GT 30" Flux: V = 9.7 +/- 0.3, F-CONT(2200.0) = 14.0 +/- 5.0 E-16, F-CONT(1800.0) = 13.0 +/- 5.0 E-17 Comments: RHEA MAY BE OBSERVED AT ANY OLG Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: On_Hold_Comments: ! From Line 1 Exposure_number: 10 Target_Name: IAPETUS-DARK Config: FOS/RD Opmode: ACQ/BINARY Aperture: 4.3 Sp_Element: MIRROR Wavelength: 5500.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 0.75S Special_Requirements:ONBOARD ACQ FOR 20-30 Comments: ! From Line 2 Exposure_number: 20 Target_Name: IAPETUS-DARK Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G270H Wavelength: 2750.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 1400S Special_Requirements: Comments: ! From Line 3 Exposure_number: 30 Target_Name: IAPETUS-DARK Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G190H Wavelength: 2000.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 5500S Special_Requirements: Comments: Visit_Number: 02 Visit_Requirements: On_Hold_Comments: ! From Line 11 Exposure_number: 10 Target_Name: IAPETUS-BRIGHT Config: FOS/RD Opmode: IMAGE Aperture: 4.3 Sp_Element: G270H Wavelength: 2600.0 Optional_Parameters: SUB-STEP=4, COMB=YES, Y-SPACE=128, Y-SIZE=5 Number_of_iterations:1 Time_Per_Exposure: 5M Special_Requirements:RT ANALYSIS FOR 20-30 Comments: FIVE FOS SPECTRA AT DIFFERENT Y DEFLECTIONS WILL BE OBTAINED FOR TARGET ACQUISITION INFORMATION. ! From Line 12 Exposure_number: 20 Target_Name: IAPETUS-BRIGHT Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G270H Wavelength: 2750.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 190S Special_Requirements:REQ UPLINK Comments: ! From Line 13 Exposure_number: 30 Target_Name: IAPETUS-BRIGHT Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G190H Wavelength: 2000.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 9M Special_Requirements: Comments: Visit_Number: 03 Visit_Requirements: On_Hold_Comments: ! From Line 21 Exposure_number: 10 Target_Name: RHEA Config: FOS/RD Opmode: IMAGE Aperture: 4.3 Sp_Element: G270H Wavelength: 2600.0 Optional_Parameters: SUB-STEP=4, COMB=YES, Y-SPACE=128, Y-SIZE=5 Number_of_iterations:1 Time_Per_Exposure: 5M Special_Requirements:RT ANALYSIS FOR 20-30 Comments: FIVE FOS SPECTRA AT DIFFERENT Y DEFLECTIONS WILL BE OBTAINED FOR TARGET ACQUISITION INFORMATION. ! From Line 22 Exposure_number: 20 Target_Name: RHEA Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G270H Wavelength: 2750.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 190S Special_Requirements:REQ UPLINK Comments: ! From Line 23 Exposure_number: 30 Target_Name: RHEA Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G190H Wavelength: 2000.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 9M Special_Requirements: Comments: Visit_Number: 04 Visit_Requirements: On_Hold_Comments: ! From Line 1 Exposure_number: 10 Target_Name: IAPETUS-DARK Config: FOS/RD Opmode: ACQ/BINARY Aperture: 4.3 Sp_Element: MIRROR Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 0.75S Special_Requirements:ONBOARD ACQ FOR 20-30 Comments: ! From Line 2 Exposure_number: 20 Target_Name: IAPETUS-DARK Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G270H Wavelength: 2750.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 1400S Special_Requirements: Comments: ! From Line 3 Exposure_number: 30 Target_Name: IAPETUS-DARK Config: FOS/RD Opmode: ACCUM Aperture: 1.0 Sp_Element: G190H Wavelength: 2000.0 Optional_Parameters: Number_of_iterations:1 Time_Per_Exposure: 5500S Special_Requirements: Comments: Data_Distribution Medium: 8MM Blocking_Factor: 10 Ship_To: PI_Address Ship_Via: UPS Recipient_Email: