! File: 1475C.PROP ! Database: PEPDB ! Date: 16-FEB-1994:19:52:40 coverpage: title_1: EXTRAGALACTIC ASTROMETRY AND ASTROPHYSICS - AST/PC title_2: PART TWO OF FIVE - PROPOSAL 1475 (WFPC OBSERVATIONS) sci_cat: QUASARS & AGN sci_subcat: ASTROMETRY proposal_for: GTO/AST longterm: 9 cont_id: 1013 pi_title: DR. pi_fname: WILLIAM pi_mi: H. pi_lname: JEFFERYS pi_inst: UNIVERSITY OF TEXAS AT AUSTIN pi_country: USA pi_phone: (512)471-1455 keywords_1: QUASARS, BL LACS, AGNS, HIPPARCOS, REFERENCE FRAMES keywords_2: FUNDAMENTAL ASTROMETRY, QUASAR INTERNAL MOTION hours_pri: 15.00 hours_par: 15.00 num_pri: 72 num_par: 36 wf_pc: Y fgs: Y pi_position: PROFESSOR ! end of coverpage abstract: line_1: The goal of this project is the determination of the rotation of line_2: the HIPPARCOS Reference Frame with respect to an Extragalactic line_3: Frame. The program will derive the internal optical motions of line_4: extragalactic objects (QSOs, BL Lacs, AGNs) at the +/- 0.002 line_5: arcsecond per year level of accuracy. line_7: 160 SAO stars within the FGSFOV of all selected QSOs, BL Lacs, line_8: and AGNs are included in the HIPPARCOS catalog. Ground based line_9: speckle observations have been used to pre-detect doubles which line_10: would cause problems for the FGS. The FGSs will measure the line_11: relative positions of SAO stars with respect to objects brighter line_12: than 17 mag. Fainter objects will be observed with the WFPC and line_13: FGS together. The objects have been selected in conjunction with line_14: the recommendations of the IAU working group in Radio/Optical line_15: Identifications, and have been selected for compactness and line_16: intensity. Most of the objects are recommended as ultimate line_17: position calibrators. ! ! end of abstract general_form_proposers: lname: JEFFERYS fname: WILLIAM title: DR. mi: H. inst: UNIVERSITY OF TEXAS AT AUSTIN country: USA ! lname: WESTPHAL fname: JAMES title: DR. inst: CALIFORNIA INSTITUTE OF TECHNOLOGY country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: The HIPPARCOS satellite will produce positions, proper motions, line_2: and parallaxes for 100,000 stars with an accuracy of 0.002 line_3: arcseconds in the positions and parallaxes. However, the nature line_4: of the observations means that the HIPPARCOS Instrumental line_5: Coordinate system will have an unknown overall rotation with line_6: respect to an inertial reference frame. The extragalactic line_7: objects define a frame which is very close to being inertial, line_8: differing only by cosmological effects. The goal of these line_9: observations is twofold: first to determine the relative line_10: positions and motions of selected Extragalactic Objects (EGOs) line_11: with respect to the HIPPARCOS reference frrame, and, by line_12: inverting the observations, infer the rotation of the HIPPARCOS line_13: frame, as part of the Astrometry Team GTO time, and second, by line_14: using the Planetary Camera and guiding FGSs in the "Transit line_15: Circle" mode, obtain structural information about the EGOs as line_16: part of the WF/PC GTO time. ! question: 2 section: 2 line_1: Several methods have been proposed to "stop" the HIPPARCOS frame line_2: rotation. The Space Telescope observations have the possibility line_3: to provide the most accurate of these determinations, possibly line_4: to the level of 0.0002 arcsec/year accuracy. Such a line_5: determination would make a significant impact on our knowledge line_6: of the motions of groups of stars (which now must have line_7: precession removed) and would provide a more stable reference line_8: frame against which to measure the motions of solar system line_9: objects, for orbital and relativity studies. line_11: Because the observations will be made over the lifetime of ST, line_12: internal apparent motions within the EGO cores will be observed line_13: or not observed at a level which can only be obtained at radio line_14: wavelengths using VLBI at the present time. The study of time line_15: variable optical positions will bring a new aspect to bear on line_16: the study of these objects. line_18: Speckle observations of candidate HIPPARCOS stars were used to line_19: determine which ones are multiple and hence unsuitable for line_20: these studies. Franz and McAlister used the KPNO 4-meter and line_21: the Perkins telescope in the northern hemisphere, and Argue line_22: and Morgan used the AAT in the southern hemisphere to obtain line_23: observations. ! question: 3 section: 1 line_1: Observations will be made with the "Transit Circle" mode line_2: using PC-8 and the astrometric data from the guiding FGSs line_3: simultaneously. The spacecraft must be oriented so that line_4: the EGO and HIP stars are aligned for appropriate use of line_5: the guide stars. ! question: 4 section: 1 line_1: Because of astrometric limitations of the atmosphere, ground- line_2: based observations are capable of only about 0.01 arcsecond line_3: accuracy in measuring the relative positions between two line_4: objects separated by more than an isoplanatic patch. These line_5: observations require the longest focus telescopes and detailed line_6: analysis of the optical distortions. This accuracy has only line_7: been achieved in a handful of fields. ST will provide single line_8: observations at the 0.002 arcsecond level, and should allow line_9: an order of magnitude increase over the ground-based line_10: observations. The standard method of ground-based observation line_11: is still the transit circle, so relative optical positions of line_12: the HIPPARCOS stars with respect to EGOs will not be measured line_13: from the ground. Radio positions using VLBI and VLA line_14: observations of RS CVn stars will be made to relate the line_15: HIPPARCOS frame to EGOs indirectly. However, ST has the line_16: capability to measure this rotation directly, without the line_17: problem of relating the optical and radio emission regions. line_18: The possible transfer of the radio reference frame to the line_19: optical will of necessity require such assumptions about line_20: the EGOs, but the use of at least 50 objects will allow line_21: statistical statements to be made which will be of great line_22: astrophysical interest. ! question: 5 section: 1 line_1: In order to minimize the impact of power constraints, the dates line_2: of observations were picked so that the nominal FGS orientation line_3: is aligned with the EGO-HIP star position angle, and off-nominal line_4: rolls are not required. However, this constraint makes the line_5: observations time-critical. Because the goal is to measure line_6: motions, the repeat observations must be made within multiples line_7: of one year within two days, in order not to contaminate the line_8: motions with the parallaxes of other HIPPARCOS stars. ! question: 6 section: 1 line_1: The astrometric data will be reduced at STScI or the University line_2: of Texas using the SDAS/ADRS Software. The reduction of WF/PC line_3: data will use the SDAF/WF-PC Software. Analysis will be line_4: performed as appropriate. In particular, the reduced poitional line_5: data will be transmitted to the HIPPARCOS project, and the line_6: analysis will be performed in conjunction with that project. line_8: The PC observations using the F606W and F658N filters require line_9: the calibrations derived from the first 3 exposure log sheet line_10: lines of GTO proposal 1013. ! question: 8 section: 1 line_1: 160 HIPPARCOS stars have been identified within 10 arcminutes of line_2: 90 EGOs. During the GTO time, we expect to make three line_3: observations of 40 HIP star-EGO pairs, two observations of 40 line_4: more, and one observation of 40 more, for a total of 120 object line_5: pairs. We have included all the candidate objects, but expect line_6: scheduling constraints to limit which objects will be observed. line_8: The success of the program depends on obtaining essentially all line_9: of the priority one observations. Priority 2 solutions will line_10: strengthen the solution. Priority 3 observations are non- line_11: critical and should be treated as "fillers." ! question: 13 section: 1 line_1: Relative positions and motions of HIPPARCOS stars will be made line_2: with respect to Extragalactic Objects (EGOs), using the Fine line_3: Guidance Sensors and the Planetary Camera in the "transit line_4: circle" mode. The data will provide information line_5: on structure changes in the cores of these objects. The line_6: position measurements will be used to derive the overall line_7: rotation of the HIPPARCOS reference frame with respect to line_8: the extragalactic reference frame. ! !end of general form text general_form_address: lname: HEMENWAY fname: PAUL mi: D title: DR. category: CON inst: UNIVERSITY OF TEXAS AT AUSTIN addr_1: DEPARTMENT OF ASTRONOMY addr_2: UNIVERSITY OF TEXAS AT AUSTIN city: AUSTIN state: TX zip: 78712 country: USA phone: (512)471-3431 ! lname: JEFFERYS fname: WILLIAM mi: H. title: DR. category: PI inst: UNIVERSITY OF TEXAS AT AUSTIN addr_1: DEPARTMENT OF ASTRONOMY addr_2: UNIVERSITY OF TEXAS AT AUSTIN city: AUSTIN state: TX zip: 78712 country: USA phone: (512)471-1455 ! ! end of general_form_address records fixed_targets: targnum: 42 name_1: 1830+285INCA221-122 descr_1: (QSO) pos_1: RA=18H 30M 52.4S +/- .2S, pos_2: DEC=+28D 31' 16.6" +/- 2" equinox: 1950 fluxnum_1: 1 fluxval_1: V = 17.2 +/- 1 ! targnum: 44 name_1: INCA221-122-AST1 descr_1: EGO-FGS2-STAR pos_1: RA =278.141717D +/- .001D, pos_2: DEC = 28.392608D +/- 0.001D equinox: 2000 fluxnum_1: 1 fluxval_1: V =8.35 +/- 1 ! targnum: 46 name_1: INCA221-122 descr_1: (HIPPARCOS-STAR) pos_1: RA=18H 29M 57.9S +/- .2S, pos_2: DEC=+28D 23' 10" +/- 2" equinox: 1950 fluxnum_1: 1 fluxval_1: V =12 +/- 1 ! targnum: 48 name_1: INCA221-122-AST2 descr_1: HIP-FGS2-STAR pos_1: RA =277.888621D +/- .001D, pos_2: DEC = 28.261908D +/- 0.001D equinox: 2000 fluxnum_1: 1 fluxval_1: V =14.79 +/- 1 ! targnum: 50 name_1: 1921-293INCA221-126 descr_1: (QSO) pos_1: RA=19H 21M 42.26S +/- .2S, pos_2: DEC=-29D 20' 27.0" +/- 2" equinox: 1950 fluxnum_1: 1 fluxval_1: V = 16.5 +/- 1 ! targnum: 52 name_1: INCA221-126-AST1 descr_1: EGO-FGS2-STAR pos_1: RA =291.045433D +/- .001D, pos_2: DEC = -29.124425D +/- 0.001D equinox: 2000 fluxnum_1: 1 fluxval_1: V =12.1 +/- 1 ! targnum: 54 name_1: INCA221-126 descr_1: (HIPPARCOS-STAR) pos_1: RA=19H 21M 55.22S +/- .2S, pos_2: DEC=-29D 24' 27.5" +/- 2" equinox: 1950 fluxnum_1: 1 fluxval_1: V =12 +/- 1 ! targnum: 56 name_1: INCA221-126-AST2 descr_1: HIP-FGS2-STAR pos_1: RA =291.130725D +/- .001D, pos_2: DEC = -29.133661D +/- 0.001D equinox: 2000 fluxnum_1: 1 fluxval_1: V =13.91 +/- 1 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 691.000 targname: 1830+285INCA221-122 config: PC opmode: IMAGE aperture: P8 sp_element: F606W num_exp: 1 time_per_exp: 130S fluxnum_1: 1 priority: 2 param_1: PRE-FLASH=YES req_1: NON-INT; req_2: SEQ 691-691.06 NO GAP; req_3: ORIENT 235D +/- .3D; req_4: REPEAT 691-691.06, 800-802 EVERY 730D req_5: +/- 2D FOR 1 MORE TIMES; req_6: SAME ORIENT FOR 691.02-691.06 AS 691; req_7: CYCLE 9 / 691-902; req_8: COND IF SUITABLE GUIDE STARS AVAILABLE req_9: FOR DESIRED ORIENTATION; req_10: GUID TOL 0.007" comment_1: NEAR JDTOBS = 2448384.250000 comment_2: USE THE SAME GUIDE STARS FOR ALL comment_3: OBSERVATIONS. A POSSIBLE PAIR FROM comment_4: GSSS FOLLOWS: ! linenum: 691.020 targname: INCA221-122 config: PC opmode: IMAGE aperture: P8 sp_element: F658N num_exp: 1 time_per_exp: 150S fluxnum_1: 1 priority: 2 param_1: PRE-FLASH=YES req_1: NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: POS TARG 10.8,-10.8 / req_5: 691.02; req_6: GUID TOL 0.007" comment_1: FGS3 GS: RA =277.988954D +/- .0008D comment_2: DEC = 28.6173D +/- .0008D comment_3: V = 12.92 +/- 1 ! linenum: 691.060 targname: 1830+285INCA221-122 config: PC opmode: IMAGE aperture: P8 sp_element: F725LP num_exp: 1 time_per_exp: 5M fluxnum_1: 1 priority: 2 param_1: PRE-FLASH=YES req_1: NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: POS TARG 10.8,-10.8 / req_5: 691,691.06; req_6: GUID TOL 0.007" ! linenum: 711.000 targname: 1921-293INCA221-126 config: PC opmode: IMAGE aperture: P8 sp_element: F606W num_exp: 1 time_per_exp: 80S fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=YES req_1: NON-INT; req_2: SEQ 711-711.06 NO GAP; req_3: ORIENT 326D +/- .3D; req_4: REPEAT 711-711.06,900,901,902 EVERY 730D req_5: +/- 2D FOR 1 MORE TIMES; req_6: SAME ORIENT FOR 711.02-711.06 AS 711; req_8: COND IF SUITABLE GUIDE STARS AVAILABLE req_9: FOR DESIRED ORIENTATION; UNPROTECTED; req_10: GUID TOL 0.007" comment_1: NEAR JDTOBS = 2448080.000000 comment_2: USE THE SAME GUIDE STARS FOR ALL comment_3: OBSERVATIONS. A POSSIBLE PAIR FROM comment_4: GSSS FOLLOWS: ! linenum: 711.020 targname: INCA221-126 config: PC opmode: IMAGE aperture: P8 sp_element: F658N num_exp: 1 time_per_exp: 1S fluxnum_1: 1 priority: 2 param_1: PRE-FLASH=YES req_1: NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: POS TARG 10.8,-10.8 / req_5: 711.02; req_6: GUID TOL 0.007" comment_1: FGS3 GS: RA =291.445567D +/- .0008D comment_2: DEC = -29.2015D +/- .0008D comment_3: V = 12.76 +/- 1 ! linenum: 711.060 targname: 1921-293INCA221-126 config: PC opmode: IMAGE aperture: P8 sp_element: F725LP num_exp: 1 time_per_exp: 150S fluxnum_1: 1 priority: 2 param_1: PRE-FLASH=YES req_1: NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: POS TARG 10.8,-10.8 / req_5: 711,711.06; req_6: GUID TOL 0.007" ! linenum: 800.000 targname: INCA221-122-AST1 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: ^ fluxnum_1: 1 priority: 2 param_1: DATA-RATE=32 req_1: PAR WITH 691;NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: GUID TOL 0.007" comment_1: FGS1 GS: RA =278.215246D +/- .0008D comment_2: DEC = 28.356444D +/- .0008D comment_3: V = 13.58 +/- 1 ! linenum: 801.000 targname: INCA221-122-AST2 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: ^ fluxnum_1: 1 priority: 2 param_1: DATA-RATE=32 req_1: PAR WITH 691.02;NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: GUID TOL 0.007" comment_1: EQUINOX=J2000 ! linenum: 802.000 targname: INCA221-122-AST1 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: ^ fluxnum_1: 1 priority: 2 param_1: DATA-RATE=32 req_1: PAR WITH 691.06;NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: GUID TOL 0.007" ! linenum: 900.000 targname: INCA221-126-AST1 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: 16S fluxnum_1: 1 priority: 2 param_1: DATA-RATE=32 req_1: PAR WITH 711;NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: GUID TOL 0.007" comment_1: FGS1 GS: RA =291.043071D +/- .0008D comment_2: DEC = -29.366942D +/- .0008D comment_3: V = 14.4 +/- 1 ! linenum: 901.000 targname: INCA221-126-AST2 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: 0.2S fluxnum_1: 1 priority: 2 param_1: DATA-RATE=32 req_1: PAR WITH 711.02; COND IF SUITABLE GUIDE req_2: STARS AVAILABLE FOR DESIRED ORIENTATION; req_3: GUID TOL 0.007";NON-INT; comment_1: EQUINOX=J2000 ! linenum: 902.000 targname: INCA221-126-AST1 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: ^ fluxnum_1: 1 priority: 2 param_1: DATA-RATE=32 req_1: PAR WITH 711.06;NON-INT; req_2: COND IF SUITABLE GUIDE STARS AVAILABLE req_3: FOR DESIRED ORIENTATION; req_4: GUID TOL 0.007" ! ! end of exposure logsheet ! No scan data records found