Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5079c Report Date: 09-May-96:20:24 Version: ********** Check-in Date: ********** 1.Proposal Title: DYNAMICS OF PLANETARY UPPER ATMOSPHERES - CYC3HIGH ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID SOLAR SYSTEM GTO/HSP 4257 Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Robert C. Bless WISCONSIN, UNIVERSITY OF USA 608-262-1715 ------------------------------------------------------------------------------------ 7. Abstract Observations of planetary upper atmospheres through stellar occultations are of interest because they provide information about the radiative and dynamical processes at work in these rarefied regions (number density range: 10super13 - 10super15 cmsuper-3), which could be otherwise measured only through direct atmospheric probe launched from a spacecraft. One of the problems with interpretation of the temperature profiles obtained from ground-based occultation observations has been that the numerical inversion of the data is highly sensitive to photometric errors--especially in obtaining the mean temperature of the atmosphere. This photometry will allow us to analyze data from the occultation of U111 by Uranus on 14 April 1993. ------------------------------------------------------------------------------------ 8. Scientific Key Words: PLANETARY ATMOSPHERES, JOVIAN PLANETS, MARS, UPPER OCCULTATIONS, TEMPERATURE PROFILES ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.00 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HSP ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5079c PI: Robert C. Bless Proposal Title: DYNAMICS OF PLANETARY UPPER ATMOSPHERES - CYC3HIGH ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Edward L. Robinson TEXAS, UNIVERSITY OF USA Robert C. Bless WISCONSIN, UNIVERSITY OF USA G. W. Van Citters NATIONAL SCIENCE FOUNDATION USA Joseph F. Dolan NASA, GODDARD SPACE FLIGHT USA CENTER Richard L. White SPACE TELESCOPE SCIENCE USA INSTITUTE James L. Elliot MASSACHUSETTS INSTITUTE OF USA TECHNOLOGY ------------------------------------------------------------------------------------ 3. Description of proposed observations. In order to reduce data previously obtained (occultation of U111 by Uranus on 14 April 1993) we need a time series on the occulted star in the two filters used for the occultation observations (F750W and F320N). We are requesting a full orbit's worth of data in order to characterize the VIS tube's photometric stability, as that is important to the analysis of the Uranus occultation data, and this tube is not calibrated sufficiently for this analysis in HSP calibration proposals. Coarsetrack is acceptable if necessary. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. We need to measure the flux from the previously occulted star in exactly the bandpasses which were used during the occultation. This is not possible from the ground due to atmospheric absorption. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Data will be reduced and analyzed at MIT with the DEC 5000 belonging to the planetary astronomy group. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Data reduction and analysis will be supported on computer facilities at MIT. ------------------------------------------------------------------------------------ 13. Observations of the upper atmospheres of Mars and the Jovian planets with HSP through stellar occultations will provide infromation about the radiative and dynamical processes in this region. The temperature profiles obtained will allow testing of the various transfer models for each planet. ------------------------------------------------------------------------------------ 11. Address Information Name: ROBERT C. BLESS Category: PI Institution: UNIVERSITY OF WISCONSIN Address: DEPARTMENT OF ASTRONOMY City: MADISON State: WI Zip Code: 53706 Country: USA Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ Page 3 Name: JAMES L. ELLIOT Category: CON Institution: MASSACHUSETTS INSTITUTE OF TECHNO Address: BLDG. 54-422 City: CAMBRIDGE State: MA Zip Code: 02139 Country: USA Telephone: 617-253-6308 Telex (or e-mail): 921473 MIT CAM ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5079c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 17 U111 GSC6311 STAR OCCULTED BY PLATE-ID = 01O4, J2000 BKG 1 V = 12.6 +/- 0.5 -00105 URANUS. RA = 19H 36M 18.944S +/- 0.03", DEC = -22D 02' 54.42" +/- 0.04", ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5079c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 4 DEFINE # HSP/ ACQ 1 1S 1 1 ONBRD- VIS ACQ ------------------------------------------------------------------------------------------------------------------------------------ 7 DEFINE # HSP/ SPLIT 1.0 F750W/ # 1 1M 1 1 OCC- PMT/ F320N PHOT VIS ------------------------------------------------------------------------------------------------------------------------------------ 7.5 DEFINE ^ S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 7.0 OCC- PHOT Comments: CAPTURE FGS TLM DURING PHOTOMETRY. ------------------------------------------------------------------------------------------------------------------------------------ 40.09 USE U111 X20 ONBOARD ACQ FOR ONBRD- 40.10 ACQ SEQ 40.09 - 40.10 NO GAP PCS MODE F / 40.09 - 40.10 CYCLE 3 / 40.09 - 40.10 ------------------------------------------------------------------------------------------------------------------------------------ 40.1 USE OCC U111 SAMPLE-TIME=0.1 X40 -PHOT DATA-FORMAT=ALL PMT- ANALOG=10000 VIS-ANALOG=1000 Comments: SCHEDULE AS CLOSE TO RE-RUN OF 4257 (DUE TO HOPR) AS POSSIBLE. PREFERABLY WITHIN 3 HOURS. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5079c [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/VIS HSP/PMT/VIS S/C ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ SPLIT DATA ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FORMAT=FN SAMPLE-TIME DATA-FORMAT PMT-ANALOG VIS-ANALOG ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HSP ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category SOLAR SYSTEM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PAR WITH 7.0; ONBOARD ACQ FOR 40.10; SEQ 40.09 - 40.10 NO GAP; PCS MODE F / 40.09 - 40.10; CYCLE 3 / 40.09 - 40.10 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F750W/F320N ------------------------------------------------------------------------------------------------------------------------------------ Target Names U111 GSC6311-00105 ------------------------------------------------------------------------------------------------------------------------------------