Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 2165c Report Date: 09-May-96:16:55 Version: ********** Check-in Date: ********** 1.Proposal Title: GHRS MOVING TARGET ACQUISITION AND TRACKING ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID SV/HRS Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dennis C Ebbets BALL AEROSPACE SYSTEMS GROUP USA 303-939-5964 ------------------------------------------------------------------------------------ 7. Abstract This test was rewritten April 28, 1989 for the SV Scrub Plan, after consultation with Hal Weaver. The goal of this test is to develop and verify the ability to acquire and track rapidly moving solar system objects such as comets and asteriods. There are two procedures identified, a WFC Int Acq, and an FOS Acq/Firmware. We also make GHRS Images in both undispersed UV light with N2, and the light of CS emission at 2576A. This may be useful for Dispersed Light Target Acq. if sufficiently bright and concentrated near the nucleus. ------------------------------------------------------------------------------------ 8. Scientific Key Words: GHRS,SCIENCE VERIFICATION,TARGET ACQUISITION CALIBRATION ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.80 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HRS WF/PC ------------------------------------------------------------------------------------ 12. Special sched req: Time Critical obs. ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 2165c PI: Dennis C Ebbets Proposal Title: GHRS MOVING TARGET ACQUISITION AND TRACKING ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ L. M. Trafton UNIV OF TEXAS USA J. C. Brandt LASP/UNIV OF COLORADO USA Dennis C. Ebbets BALL AEROSPACE SYSTEMS USA Hal Weaver SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 2. Scientific Justification. Comets will be important scientific targets for the GHRS during the GTO and GO phases. Four problems will complicate observations when they are nearest the Earth. (1) The ephemeris may not be known precisely enough when proposals are written to predict the location at observation time to better than a few arc seconds. (2) The rate of motion across the sky may make it difficult or impossible to perform a WFC assisted acquisition using common quide stars. (3) It may be difficult to track in FGS Fine Track Lock for the required exposure time. (4) The extended appearance will complicate on board Mode II target acquisition using current (9/87) GHRS flight software. The observations proposed here describe a plausible approach to overcome the first three issues. ------------------------------------------------------------------------------------ 3. Description of proposed observations. 1. Interactive Acquisition with WFC (and/or GHRS) a. WFC V image (F569W) to identify target b. WFC UV image (F284W) c. offset to GHRS 2.0 aperture c. GHRS map and measure flux with Mirror N2 guide on gyros along approximate path d. GHRS Image Mode observation at 2576A light of CS e. GHRS Accum Mode spectrum at 2576A. f. return to WFC and repeat image to judge guiding accuracy 2. FOS assisted on- board acquisition a. Acq/Firmware acquisition b. offset to WFC t a particular pixel c. WFC image to judge accuracy of FOS acquisition ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. Test should be performed when the target is moving with a porper motion in the range 0.01 to 0.1 "/sec. Real time analysis is needed to process the WFC images as Interactive Acquisitions. The ability to track and guide accurately for approximately 45 minutes is the main purpose of the test. Gyro control will be used while tracking comet. SV Minimum Plan: All SV Delta Plan: None Guiding tolerance 0.20 arc seconds SV PREREQUISITES: FOS Mode II Target Acquisition - 2195 GHRS Mode II Target Acquisition - 1352 GHRS WF/PC Assisted Target Acquisition - 1400 OV Moving Target OLT - 2183 ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Cross-calibrate WFC and GHRS acquisition mirror count rates. Use location of target in field maps to estimate accuracy of tracking on gyros for ten minutes at a time. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Data analysis facilities Test personnel Travel and publication support ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: D. C. EBBETS Category: PI Institution: BALL AEROSPACE Address: PO BOX 1062 FT-3 City: BOULDER State: CO Zip Code: 80306 Country: USA Telephone: (303)939-5964 Telex (or e-mail): ------------------------------------------------------------------------------------ Name: HAROLD A. WEAVER Category: Institution: SPACE TELESCOPE SCIENCE INSTITUTE Address: 3700 SAN MARTIN DRIVE City: BALTIMORE State: MD Zip Code: 21218 Country: USA Telephone: 301-338-4765 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 2165c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 | TARGET NAME: WILD ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET WILD 2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = WILD 2 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | | | USER AFTER LATE NOVEMBER,1990 | | THROUGH EARLY 1991. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 | TARGET NAME: SWIFT ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET SWIFT-GEHREL ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SWIFT-GEHREL | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | | | USE FROM MID-OCT 1990 TO LATE DEC | | 1990. | ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2165c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 DEF # WFC IMAGE W1 F569W 1 0.2S 100 1 1 INT ACQ FOR 2-5 COMET1 SEQ 1-6 GUID TOL 0.20"/1-6 CYCLE 0 / 1-31 Comments: BLIND POINT TO COMET WHILE TRACKING COMET UNDER GYRO CONTROL. ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ ^ ^ ^ ^ F284W 1 2M 80 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ ^ HRS ACQ 2.0 MIRROR-N2 MAP=END-POINT 1 265S 10 1 1 ONBOARD ACQ FOR 4, SEARCH-SIZE=1 5 LOCATE=NO FAINT=10 Comments: STEP-TIME=1 ------------------------------------------------------------------------------------------------------------------------------------ 4 ^ ^ ^ ^ IMAGE ^ G270M CARPOS=9792 1 968S 10 1 1 X=2035 Y=2781 Comments: STEP-TIME=2 ------------------------------------------------------------------------------------------------------------------------------------ 5 ^ ^ ^ ^ ACCUM ^ G270M 2576 STEP-PATT=3 1 4M 20 ^ COMB=FOUR DOPPLER=DEF STEP-TIME=0.2 ------------------------------------------------------------------------------------------------------------------------------------ 6 ^ ^ ^ WFC IMAGE W1 F569W 1 0.2S 100 1 1 Comments: BLIND POINT TO COMET WHILE TRACKING COMET UNDER UNDER GYRO CONTROL. ------------------------------------------------------------------------------------------------------------------------------------ 10 DEF # FOS/RD ACQ/ 4.3 MIRROR 1 1M 10 1 1 ONBOARD ACQ FOR 11 COMET2 FIRMWAR ,12 E SEQ 10-12 Comments: EXPOSURE TIMES UNCERTAIN FOR FOS OBS OFFSET TO WFC AFTER FOS ACQUISITION ------------------------------------------------------------------------------------------------------------------------------------ 11 ^ ^ ^ WFC IMAGE W1 F569W 1 0.2S 100 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 12 ^ ^ ^ ^ ^ ^ F284W ^ 2.0M 80 ^ ------------------------------------------------------------------------------------------------------------------------------------ 20 USE WILD SELECT 1 OF 20-21 COMET1 OR 30-31 COND IF TARGETS ARE AVAILABLE ------------------------------------------------------------------------------------------------------------------------------------ 21 USE WILD COND IF TARGETS COMET2 ARE AVAILABLE ------------------------------------------------------------------------------------------------------------------------------------ 30 USE SWIFT COND IF TARGETS COMET1 ARE AVAILABLE ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2165c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 31 USE SWIFT COND IF TARGETS COMET2 ARE AVAILABLE ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 2165c [ 7] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC ^ HRS FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ^ ACQ ACCUM ACQ/FIRMWARE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters MAP=END-POINT SEARCH-SIZE=1 LOCATE=NO FAINT=10 CARPOS=9792 X=2035 Y=2781 STEP-PATT=3 COMB=FOUR DOPPLER=DEF STEP-TIME=0.2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for SV/HRS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.80 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements INT ACQ FOR 2-5; SEQ 1-6; GUID TOL 0.20"/1-6; CYCLE 0 / 1-31; ONBOARD ACQ FOR 4,5; ONBOARD ACQ FOR 11,12; SEQ 10-12; SELECT 1 OF 20-21 OR 30-31; COND IF TARGETS ARE AVAILABLE; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F569W F284W MIRROR-N2 G270M MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names WILD SWIFT ------------------------------------------------------------------------------------------------------------------------------------