! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /spectre/data1/aroman/proposals/6291.prop ! Generated by PREPROCESSOR, version 6.0c ! Date: Fri Dec 1 18:12:48 EST 1995 Proposal_Information Title: URANUS: LY-ALPHA AND H2 SURVEY Proposal_Category: GTO/HRS Scientific_Category: SOLAR SYSTEM Cycle: 5 Investigators PI_Name: LAURENCE TRAFTON PI_Institution: UNIVERSITY OF TEXAS Abstract: Survey Uranus' FUV spectrum at low-resolution using the solar-blind grating G140L with the GHRS. The spectra will span 1072-1645 A which includes the regions of the Lyman and Werner H2 bands to search for emissions from H2 and aeronomical species generated by ion chemistry in the intense aurora and ionosphere. A comparative study with Jupiter will be attempted. Also, obtain moderately high-resolution spectra of Uranus' Ly-alpha emission near quadrature so that the Uranian emission is Doppler shifted out of the geocoronal emission. For this, grating ECH-A will be used with the LSA to optimize the tradeoff between resolution and throughput. The Ly-alpha line profile will be obtained and interpreted in terms of ionospheric and auroral emission. Questions Observing_Description: The GHRS+LSA will be used with Side 1 to obtain spectra of Uranus' Ly-alpha H emission and H2 emissions to study the auroral vs. ionospheric contributions. An offset acquisition will be performed after an ONBOARD-ACQ of Titania. G140L will be used to survey the H-alpha/Werner-band region and also the dayglow region of the Lyman-H2 bands near 1500A. Ech-A will obtain a high-resolution spectrum of H-alpha near pre-opposition quadrature. Quadrature is required for the ECH-A spectrum in order to Doppler-shift Uranus' Ly-alpha line away from the geocoronal line. Pre-opposition quadrature permits a search for D-alpha emission as part of the high-resolution survey. Uranus opposition is July 9, 1996. Real_Time_Justification: Calibration_Justification: Additional_Comments: This is a reduced version of the original GTO proposal 1202, restored to the original choice of Side 1 after the early loss of Side 1 temporarily forced a change to Side 2. Fixed_Targets Solar_System_Targets Target_Number: 1 Target_Name: URANUS Description: PLANET URANUS Level_1: STD=URANUS Level_2: Level_3: Window: OLG OF URANUS BETWEEN 60 90 Flux: TYPE=G2V V = 5.7 SURF(1216.0)=31.0e-13 W-LINE(1216.0)=10.0e-3 SURF-BKG(1216.0)=7.6e-12 SURF(1600.0)=23.0e-15 Comments: OBSERVE AURORAL AND IONOSPHERIC EMISSION FROM DISK. PHASE IS ARBITRARY. Target_Number: 2 Target_Name: TITANIA-OFFSET Description: SATELLITE TITANIA Level_1: STD=URANUS Level_2: STD=TITANIA Level_3: Window: SEP OF TITANIA URANUS FROM EARTH GT 3" Flux: TYPE=G2V V = 13.8 F-CONT(5500.0)=9.899999999999999e-15 F-CONT(2600.0)=6.5e-17 Comments: BLIND POINT TO TITANIA OR TO ANOTHER SUITABLE URANIAN SATELLITE FOR AN ONBOARD ACQ OF URANUS. THE OTHER SATELLITES MUST NOT BE TOO CLOSE TO CONFUSE ACQ. FLUXES ARE APPROXIMATE. Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: GUID TOL 0.1030" BETWEEN 25-Apr-1996 AND 19-May-1996 On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: TITANIA-OFFSET Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 50S Special_Requirements: ONBOARD ACQ FOR 40-60 SEQ 10-20 NON-INT Comments: STEP-TIME=5.55; 1072 cts/dwell Exposure_Number: 20 Target_Name: TITANIA-OFFSET Config: HRS Opmode: IMAGE Aperture: 2.0 Sp_Element: MIRROR-N2 Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 1192.96S Special_Requirements: Comments: STEP-TIME=4.66S; 270 cts/dwell GET A MAP AT REDUCED DWELL TIME TO CHECK ACQ. Exposure_Number: 30 Target_Name: WAVE Config: HRS Opmode: ACCUM Aperture: SC2 Sp_Element: G140L Wavelength: 1500.0 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 27.2S Special_Requirements: Comments: (EXPOSURE OK?) Exposure_Number: 40 Target_Name: URANUS Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1500.0 Optional_Parameters: SPYBAL=NO Number_of_Iterations: 1 Time_Per_Exposure: 408S Special_Requirements: Comments: SHOULD FOLLOW 30 WITHOUT MOVING GRATING BETWEEN WAVE AND FIRST SUBEXPOSURE OF 40. Exposure_Number: 45 Target_Name: URANUS Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1500.0 Optional_Parameters: Number_of_Iterations: 7 Time_Per_Exposure: 408S Special_Requirements: Comments: Exposure_Number: 50 Target_Name: URANUS Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140L Wavelength: 1216.0 Optional_Parameters: Number_of_Iterations: 5 Time_Per_Exposure: 408S Special_Requirements: Comments: Exposure_Number: 60 Target_Name: URANUS Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-A Wavelength: 1215.7 Optional_Parameters: STEP-TIME=1 Number_of_Iterations: 13 Time_Per_Exposure: 544S Special_Requirements: Comments: OBSERVE NEAR QUADRATURE FOR DOPPLER SHIFT TO SEPARATE JOVIAN AND GEOCORONAL LY-ALPHA. OBSERVE PREOPPOSITION QUAD. TO MAXIMIZE VIS. OF D-ALPHA. Try to break up this long exposure into one or two per orbit without leaving gaps longer than 4 minutes/orbit. Data_Distribution ! Defaults indicated; change if desired Medium: 8MM Blocking_Factor: 10 Ship_To: PI_address Ship_Via: UPS Recipient_Email: ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator