Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 2544c Report Date: 09-May-96:17:10 Version: ********** Check-in Date: ********** 1.Proposal Title: NIGHTTIME MEASUREMENTS OF NITRIC OXIDE ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID SOLAR SYSTEM GO Sub Category INNER PLANETS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr Cassandra G. Fesen DARTMOUTH COLLEGE USA 603-646-2230 ------------------------------------------------------------------------------------ 7. Abstract We propose to make the first nighttime measurements of nitric oxide (NO) in the earth's lower thermosphere and mesosphere. Nitric oxide is an important constituent of the earth's upper atmosphere but has been poorly observed. The GHRS on the HST provides an extremely simple and efficient way to measure UV absorption bands of NO using B and/or O target stars acquired by the GHRS for other GO/GTO investigations. Several minutes before the target is occulted by the earth, we request a change of grating to obtain NO altitude profiles. The only time requested for this project is the last few minutes before earth occultation, a period when the instrument would normally be idle. Atmospheric models have demonstrated that NO in the 80-120 km region is quite sensitive to vertical transport, especially at night. The transport is typically parametrized by the eddy diffusion coefficient which is poorly known. The unique HST measurements would test and refine our knowledge of the earth's upper atmospheric diffusion processes. ------------------------------------------------------------------------------------ 8. Scientific Key Words: OCCULTATION, NITRIC OXIDE ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 0.53 par: 0 10. Num targs pri: 6 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HRS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 2544c PI: Dr Cassandra G. Fesen Proposal Title: NIGHTTIME MEASUREMENTS OF NITRIC OXIDE ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Prof. Charles A Barth COLORADO, UNIVERSITY OF USA Dr. Raymond G Roble NCAR USA Dr. John C Brandt COLORADO, UNIVERSITY OF USA Dr. Robert A Fesen DARTMOUTH COLLEGE USA Dr. Cassandra G. Fesen DARTMOUTH COLLEGE USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. The HST GHRS will be used to make measurements of the absorption by the nitric oxide (1,0) delta band, roughly centered near 1829.41 A. The G200M grating will be used to provide spectral coverage of the wavelength region from approximately 1810 A to 1850 A. These measurements will be obtained by observing B and/or O stars as they are occulted by the dark limb of the earth. The large aperture grating will be used to maximize the ability to track and observe the star. Rapid readout mode is required. This project differs from most GO programs in that specific targets are NOT requested. Instead, we will use stars already acquired by other investigators in order to probe the earth's thermospheric nitric oxide concentration during the nighttime. Approximately 4 minutes before the target star passes behind the dark earth, we request that the GHRS instrument configuration be changed to that compatible with our project. The instrument field of view is expected to pass through the 75-200 km region in approximately 68 seconds. We will take 0.9-second integrations to provide 2-km altitude resolution. In detail, the proposed sequence for observations is: 1) select a target: B or O target stars brighter than 5th magnitude observed with the GHRS by an independent project; 2) observe the target as specified by the GO or GTO. If the occulting earth is in darkness, stop the observations when the stellar zenith angle is approximately 95 degrees; this is estimated to be about 3.2 minutes before occultation; 3) change the instrument configuration: grating, G200M; aperture, 2" x 2"; data mode, rapid readout; 4) at stellar zenith angle 101 degrees, begin observations; do 0.9 second integrations for 70 seconds. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. HST has the capability to make observations of nitric oxide that are unique. Nitric oxide (NO) is an important constituent of the earth's upper atmosphere but has never been measured at nighttime. Not only will the HST permit such measurements, but inferences on the local time variation of NO during the night could be made if observations of a fixed star were made during several orbits. These observations will also provide measurements of a region that has been poorly sampled in the past: the low-latitude atmosphere. Daytime observations of NO have been made for many years by rocket- and satellite-borne instruments. Satellite observations include those of the Atmosphere Explorer series (AE-C and AE-D) and the Solar Mesosphere Explorer. Emphasis was generally placed on the high-latitude regions where NO is more abundant and more variable. Satellite conditions were such that measurements were made at a fixed local time (e.g., 1500 LT for SME) or a restricted range of local times (e.g., 0600-1000 LT for AE- D). Our proposed HST observations provide a simple and straightforward way to extend this NO database from solely daytime measurements into the night. Page 3 ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. Ideally, this program would provide information on the solar cycle, seasonal, and diurnal dependence of NO. The observing time awarded in the present cycle precludes such a detailed study; the emphasis now is on demonstrating the viability of the technique. Again, observations of specific stars are not requested: we are "piggybacking" onto approved programs which observe B and/or O stars that are occulted by the dark earth. For each observation, we request approximately 17 minutes of spacecraft time and 70 seconds of exposure time. The 17 minutes of time is an estimate of instrument overhead needed to change the grating, aperture, and data acquisition modes. The 70-second exposure time is that required to obtain measurements from 200 to 75 km in 2-km intervals. Our exposure time is therefore inflexible. Our signal-to-noise ratio may then be increased by judicious averaging. The example calculations shown below indicate that the signal-to-noise ratios we anticipate given the constraints of the observations. flux at 1829 A for selected B and O stars: about 1E-9 G200M grating sensitivity at 1829 A : 1.5E12 for the large aperture (LSA) Count rate = CDS = flux x sensitivity x aperture transmission CDS is estimated to be about 1500 maximum signal-to-noise S/N is the square root of (CDS x ns x t) where ns is the number of pixels averaged together in the diode and t is the integration time. ns is greater than or equal to 1, while t is 0.9 seconds. Then the typical S/N is about 35. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. The proposed observations are to observe stellar occultations with the GHRS to study the earth's atmosphere. We will observe B stars that were targeted by two other GO's (#2403 and #2251). By utilizing targets already acquired and observed with GHRS, we eliminate much of the instrument overhead and slew time. By observing occulting stars, we utilize the instrument during periods when it would otherwise be idle. The acquisition and calibrations for our project requires about 17 minutes of time, plus 70 seconds for exposure time. We will require guidance in determining when to begin our observations. Five of the six targets we have specified in our exposure logsheet are being observed by 2 other GO's: the proposal id's are #2403 (2 of our targets) and #2251 (3 of our targets). These two investigations were rated as "High" priority investigations. We request that 3 or more exposures be taken of each of these targets as it is occulted. We assumed it would be most efficient if these exposures were taken on consecutive orbits. We therefore used an "AFTER" special requirement in the exposure logsheets with the time interval equal to the orbit time. We did not indicate a special requirement of "DARK TIME" on our logsheets, since we were not sure if that was a valid constraint on our observations. Page 4 ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. GHRS data will be reduced by the pipeline data reduction scheme. No extraordinary problems are anticipated in this phase. The occultation data will be analyzed using software developed by co-investigator R. Roble of NCAR for similar investigations which used the sun as the light source. Extension of the method to use different stellar sources is straightforward. The NO absorption band data will consist of measurements of intensity vs time. Spacecraft orbital information will be used to transform the data into intensities vs slant path height. The data will then be filtered and smoothed. The observed signal at 1829 A is due to NO and O2 bands. The O2 signal can be removed by using the observations near 1820 A and 1835 A where O2 alone absorbs to determine the O2 contribution and then subtract it from the signal. The residual intensity is related to the tangential column number density of the absorbing species, NO, through Beer's law. The equation relating intensity and number density is an Abel integral equation, for which various numerical schemes have been developed. The result is the number density of the absorbing species as a function of the tangent point. The nighttime number density profiles will be compared to NCAR thermospheric general circulation model which predicts the global NO densities in this atmospheric region. Numerical experiments are anticipated to determine the influence of various transport processes on the NO number densities, particularly vertical eddy diffusion. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. The targets required are early B or late O stars, with V less than 5, which are being observed for other investigators. If the project proves feasible, we will extend the observations to other features of interest, such as the 2150 A bands of NO and the 2800 A emission of Mg+, and the UV lines of chlorine, water vapor, ozone, etc. ------------------------------------------------------------------------------------ 9. Description of previous HST work. No ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). The resources provided by Dartmouth include computer time and programming assistance for data reduction and analysis: software development, graphics, and post-processing will be carried out at the home institution. ------------------------------------------------------------------------------------ 11. Address Information Name: CASSANDRA G. FESEN Category: PI Institution: DARTMOUTH COLLEGE Address: THAYER SCHOOL OF ENGINEERING City: HANOVER State: NH Zip Code: 03755 Country: USA Telephone: 603-646-2230 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 2544c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 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| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 101 HD36512 NU- STAR; TYPE=B0V; RA = 5H 31M 55.8S +/- 2000 1 V = 4.62, TYPE = B0V ORI OCCULTATION 0.007", 2 F(1830) = 1.62E-9 DEC = -7D 18' 05" +/- 0.004" ------------------------------------------------------------------------------------------------------------------------------------ 102 HD91316 RHO- STAR; TYPE=B1IB; RA = 10H 32M 48.6S +/- 2000 1 V = 3.85, TYPE = B1IB LEO OCCULTATION 0.002", 2 F(1830) = 1.39E-9 DEC = +9D 18' 24" +/- 0.002" Comments: THIS STAR IS TARGETED BY GO 2251, SO IT SHOULD BE SCHEDULED WITH THAT PROJECT. ------------------------------------------------------------------------------------------------------------------------------------ 103 HD212571 PI- STAR; TYPE=B1V; RA = 22H 25M 16.5S +/- 2000 1 V = 4.6, TYPE = B1V AQR OCCULTATION 0.002", DEC = +1D 22' 39" +/- 0.002" Comments: THIS STAR IS TARGETED BY GO 2251, SO IT SHOULD BE SCHEDULED WITH THAT PROJECT. ------------------------------------------------------------------------------------------------------------------------------------ 104 HD35149 23- STAR; TYPE=B1V; RA = 5H 22M 49.9S +/- 2000 1 V = 5.0, TYPE = B1V ORI OCCULTATION 0.009", DEC = +03D 32' 40" +/- 0.007" Comments: THIS STAR IS TARGETED BY GO 2251, SO IT SHOULD BE SCHEDULED WITH THAT PROJECT. ------------------------------------------------------------------------------------------------------------------------------------ 105 HD116658 STAR; TYPE=B1III; RA = 13H 25M 11.5S +/- 2000 1 V = 0.98, TYPE = B1III ALPHA-VIR OCCULTATION 0.002", DEC = -11D 09' 41" +/- 0.002" Comments: THIS STAR IS TARGETED BY GO 2403 AND 2536, SO IT SHOULD BE SCHEDULED WITH THAT PROJECT. ------------------------------------------------------------------------------------------------------------------------------------ 106 HD33328 STAR; TYPE=B2; RA = 5H 09M 8.7S +/- 0.003", 2000 1 V = 4.27, TYPE = B2IV LAMBDA-ERI OCCULTATION DEC = -08D 45' 15" +/- 0.003" Comments: THIS STAR IS TARGETED BY GO 2403 SO IT SHOULD BE SCHEDULED WITH THAT PROJECT. ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2544c [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD36512 HRS ACQ 2.0 MIRROR 1 3S 50 1 10 ONBOARD ACQ FOR 2- 4 Comments: SCHEDULE ALL TARGETS AS THEY ARE OCCULTED BY EARTH'S ATMOSPHERE. 3 SEPARATE OCCULTATIONS REQUESTED IN 2-4 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 10 0.9S Comments: GYROHOLD ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 10 AFTER 2 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 2 AND 4 ------------------------------------------------------------------------------------------------------------------------------------ 4 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 10 AFTER 3 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 2-3 ------------------------------------------------------------------------------------------------------------------------------------ 5 HD116658 HRS ACQ 2.0 MIRROR 1 3S 50 1 1 ONBOARD ACQ FOR 6- 10 Comments: 5 SEPARATE OCCULTATIONS REQUESTED IN 6-10 ------------------------------------------------------------------------------------------------------------------------------------ 6 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 0.9S Comments: GYROHOLD ------------------------------------------------------------------------------------------------------------------------------------ 7 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 6 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 6 AND 8-10 ------------------------------------------------------------------------------------------------------------------------------------ 8 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 7 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 6-7 AND 9-10 ------------------------------------------------------------------------------------------------------------------------------------ 9 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 8 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 6-8 AND 10 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD116658 HRS RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 9 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 6-9 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2544c [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 11 HD91316 HRS ACQ 2.0 MIRROR 1 3S 50 1 5 ONBOARD ACQ FOR 12 -15 Comments: 4 SEPARATE OCCULTATIONS REQUESTED IN 12-15 ------------------------------------------------------------------------------------------------------------------------------------ 12 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 0.9S Comments: GYROHOLD ------------------------------------------------------------------------------------------------------------------------------------ 13 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 12 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 12 AND 14-15 ------------------------------------------------------------------------------------------------------------------------------------ 14 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 13 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 12-13 AND 15 ------------------------------------------------------------------------------------------------------------------------------------ 15 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 14 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 12-14 ------------------------------------------------------------------------------------------------------------------------------------ 16 HD33328 HRS ACQ 2.0 MIRROR 1 3S 50 1 1 ONBOARD ACQ FOR 17 -21 Comments: 5 SEPARATE OCCULTATIONS REQUESTED IN 17-21 ------------------------------------------------------------------------------------------------------------------------------------ 17 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 0.9S Comments: GYROHOLD ------------------------------------------------------------------------------------------------------------------------------------ 18 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 17 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 17 AND 19-21 ------------------------------------------------------------------------------------------------------------------------------------ 19 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 18 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 17-18 AND 20- 21 ------------------------------------------------------------------------------------------------------------------------------------ 20 HD33328 HRS RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 19 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 15-19 AND 21 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2544c [ 8] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 21 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 1 AFTER 20 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 17-20 ------------------------------------------------------------------------------------------------------------------------------------ 22 HD212571 HRS ACQ 2.0 MIRROR 1 3S 50 1 5 ONBOARD ACQ FOR 23 -27 Comments: 5 SEPARATE OCCULTATIONS REQUESTED IN 23-27 ------------------------------------------------------------------------------------------------------------------------------------ 23 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 0.9S Comments: GYROHOLD ------------------------------------------------------------------------------------------------------------------------------------ 24 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 23 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 23 AND 25-27 ------------------------------------------------------------------------------------------------------------------------------------ 25 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 24 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 23-24 AND 26- 27 ------------------------------------------------------------------------------------------------------------------------------------ 26 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 25 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 23-25 AND 27 ------------------------------------------------------------------------------------------------------------------------------------ 27 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 26 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 23-26 ------------------------------------------------------------------------------------------------------------------------------------ 28 HD35149 HRS ACQ 2.0 MIRROR 1 3S 50 1 5 ONBOARD ACQ FOR 29 -33 Comments: 5 SEPARATE OCCULTATIONS REQUESTED IN 29-33 ------------------------------------------------------------------------------------------------------------------------------------ 29 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 0.9S Comments: GYROHOLD ------------------------------------------------------------------------------------------------------------------------------------ 30 HD35149 HRS RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 29 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 29 AND 31-33 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2544c [ 9] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 31 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 30 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 29-30 AND 32- 33 ------------------------------------------------------------------------------------------------------------------------------------ 32 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 31 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 29-31 AND 33 ------------------------------------------------------------------------------------------------------------------------------------ 33 ^ ^ RAPID 2.0 G200M 1829 SAMPLE-TIME=0.9 1 70S 25 1 5 AFTER 32 BY 96M 0.9S Comments: GYROHOLD SCHEDULE ON A SEPARATE OCCULTATION FROM 29-32 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 2544c [ 10] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ^ ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ RAPID ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SAMPLE-TIME=0.9 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 0.53 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category SOLAR SYSTEM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category INNER PLANETS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2-4; AFTER 2 BY 96M AFTER 3 BY 96M ONBOARD ACQ FOR 6-10 AFTER 6 BY 96M AFTER 7 BY 96M AFTER 8 BY 96M AFTER 9 BY 96M ONBOARD ACQ FOR 12-15 AFTER 12 BY 96M AFTER 13 BY 96M AFTER 14 BY 96M ONBOARD ACQ FOR 17-21 AFTER 17 BY 96M AFTER 18 BY 96M AFTER 19 BY 96M AFTER 20 BY 96M ONBOARD ACQ FOR 23-27 AFTER 23 BY 96M AFTER 24 BY 96M AFTER 25 BY 96M AFTER 26 BY 96M ONBOARD ACQ FOR 29-33 AFTER 29 BY 96M AFTER 30 BY 96M AFTER 31 BY 96M AFTER 32 BY 96M ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G200M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD36512 NU-ORI HD91316 RHO-LEO HD212571 PI-AQR HD35149 23-ORI HD116658 ALPHA-VIR HD33328 LAMBDA-ERI ------------------------------------------------------------------------------------------------------------------------------------