! File: 3970C.PROP
! Database: PEPDB
! Date: 20-FEB-1994:02:04:14
coverpage:
title_1: ASTROMETRY THERMAL TEST - TAKE 2
proposal_for: OV/AST
pi_fname: WILLIAM
pi_mi: H.
pi_lname: JEFFERYS
pi_inst: TEXAS, UNIVERSITY OF
pi_country: USA
pi_phone: 512-471-1455
keywords_1: FGS, ASTROMETRY
hours_pri: 4.00
num_pri: 4
fgs: Y
time_crit: Y
pi_position: PROFESSOR
! end of coverpage
abstract:
line_1: The Astrometry Science Team will characterize the response of the prime
line_2: astrometry FGS unit to a changing HST thermal environment. By doing this test
line_3: immediately after the AST Lateral Color test done during a series of "cold"
line_5: orbits, we can determine changes in FGS behavior with timescales of 10 hours.
line_6: We can also monitor diurnal changes during the roughly 7 orbits required
line_7: for this test.
line_8: There are two versions of this proposal. One for FGS 1, one for FGS 3.
line_10: This is for FGS 3.
line_11: Modified to use PUPIL 910918 GFB
line_12: Modified for better hot orientation (PE inputs) GFB 911001
!
! end of abstract
general_form_proposers:
lname: JEFFERYS
fname: WILLIAM
mi: H.
inst: TEXAS, UNIVERSITY OF
country: USA
!
lname: SHELUS
fname: PETER
mi: J.
inst: TEXAS, UNIVERSITY OF
country: USA
!
lname: HEMENWAY
fname: PAUL
mi: D.
inst: TEXAS, UNIVERSITY OF
country: USA
!
lname: FREDRICK
fname: LAURENCE
mi: W.
inst: VIRGINIA, UNIVERSITY OF
country: USA
!
lname: VAN ALTENA
fname: WILLIAM
mi: F.
inst: YALE UNIVERSITY
country: USA
!
lname: BENEDICT
fname: GEORGE
mi: F.
inst: TEXAS, UNIVERSITY OF
country: USA
!
lname: DUNCOMBE
fname: RAYNOR
mi: L.
inst: TEXAS, UNIVERSITY OF
country: USA
!
lname: FRANZ
fname: OTTO
mi: G.
inst: LOWELL OBSERVATORY
country: USA
!
! end of general_form_proposers block
general_form_text:
question: 2
section: 1
line_1: The Team beleives that a rigorous thermal characterization of the inter-FGS
line_2: response to a changing thermal environment is absolutely critical to Astrometry
line_3: Science.
line_4: Astrometric measurements at the projected 0.002 arcseconds level of accuracy
line_5: require intra-FGS measurements within the "Astrometer" FGS. The intra-FGS
line_6: measurements are made on one object at a time. Thus the relative accuracy of
line_7: the target with respect to the reference objects depends on the FGS instrumental
line_8: system remaining fixed on the sky. This depends on the guiding FGSs holding HST
line_9: fixed with respect to the guide stars, and HST holding the astrometer fixed
line_10: with respect to the guiding FGSs during the astrometric measuring sequence.
line_11: Because thermal variations may cause the FGSs to move with respect to each other
line_12: at the 0.01 arcsecond level, and because we are trying to measure relative
line_14: positions to 0.002 arcseconds or better, the Astrometry OV thermal test was
line_15: designed to characterize the amplitudes and timescales for the inter-FGS motions
line_16: induced by cycling into and out of shadow, and from a worst case thermal slew
line_17: (hot to cold or cold to hot). Without such a test we can have little confidence
line_18: in the integrity of our science data, even with some simple "check" measurements
line_19: in an observing sequence. MODS to provide +60D sun angle wrt -V1 axis.
!
question: 3
section: 1
line_1: Immediately after the AST Lateral Color Test (proposal 1420)
line_2: 1) slew to hot orientation
line_3: 2) acquire guide stars
line_4: 3) acquire first target
line_5: 4) observe in FGS Pos mode for 3 minutes
line_6: 5) acquire second target
line_7: 6) observe in FGS Pos mode for 1 minute
line_8: 7) acquire third target
line_9: 8) observe 1 minute
line_10: 9) acquire fourth target
line_11: 10) observe 1 minute
line_12: 11) repeat steps 3-10 40 times
!
question: 4
section: 1
line_1: We must test the FGS units during HST operations.
!
question: 5
section: 1
line_1: To asses the effects of a changing thermal environment we must stay in "cold"
line_2: for a reasonable length of time, then remain in a "hot" state. The AST Lateral
line_3: Color Test is expected to keep the HST in a "cold" state for about 15 hours.
line_4: We wish to keep HST in a "hot" state for about the same time duration. Hence, we
line_5: remain pointed at targets which provide a hot orientation for about 10 hours,
line_6: repeating observations of our targets.
!
question: 6
section: 1
line_1: TEST MUST IMMEDIATELY FOLLOW AST LATERAL COLOR TEST (PROPOSAL 1420)
line_2: PRESENTLY SCHEDULED IN DECEMBER 1991.
line_3: The slew from the anti-sun point (the target for proposal 1420)
line_4: to the hot orientation (the target for this proposal)
line_5: should be timed so that the guide star acquisition for 1418
line_6: can start at the beginning of the visibilty period. This
line_7: insures that we begin observing thermal effects as soon as
line_8: possible.
!
question: 7
section: 1
line_1: Guide star and target data will be analyzed to determine magnitude of intra and
line_2: inter FGS positional changes throughout the approximately 10 hour hot state.
line_3: We will utilize STScI SDAS (ADRS within SDAS) and models developed to
line_4: incorporate temporal changes.
!
question: 8
section: 1
line_1: Must coordinate with proposal 1420.
line_2: Must override SAA AVOIDANCE RULE FOR THIS TEST ONLY.
!
question: 10
section: 1
line_1: On site data processing equipment at UTEXAS
!
!end of general form text
general_form_address:
lname: JEFFERYS
fname: WILLIAM
mi: H.
title: DR
category: PI
inst: TEXAS, UNIVERSITY OF
city: AUSTIN
state: TX
country: USA
!
lname: BENEDICT
fname: GEORGE
mi: F.
category: CON
inst: UNIVERSITY OF TEXAS
addr_1: ASTRONOMY DEPARTMENT
city: AUSTIN
state: TX
zip: 78712
country: USA
phone: 512-471-3448
!
! end of general_form_address records
fixed_targets:
targnum: 1
name_1: THERM1
descr_1: STAR
pos_1: RA = 22H 21M 43.478S +/- 1",
pos_2: DEC = -09D 54' 00.108" +/- 1"
equinox: 2000.0
pm_or_par: N
comment_1: NEW TARGET (10/91)
fluxnum_1: 1
fluxval_1: V = 10.65
!
targnum: 2
name_1: THERM1-1-REF
descr_1: ^
pos_1: RA = 22H 21M 24.550S +/- 1",
pos_2: DEC = -09D 55' 06.420" +/- 1"
equinox: ^
pm_or_par: ^
comment_1: NEW TARGET (10/91)
fluxnum_1: 1
fluxval_1: V=13.37
!
targnum: 3
name_1: THERM1-2-REF
descr_1: ^
pos_1: RA = 22H 21M 26.196S +/- 1",
pos_2: DEC = -09D 54' 43.920" +/- 1"
equinox: ^
pm_or_par: ^
comment_1: NEW TARGET (5/90)
fluxnum_1: 1
fluxval_1: V=11.16
!
targnum: 4
name_1: THERM1-3-REF
descr_1: ^
pos_1: RA = 22H 21M 32.906S +/- 1",
pos_2: DEC = -09D 54' 14.112" +/- 1"
equinox: ^
pm_or_par: ^
comment_1: NEW TARGET (5/90)
fluxnum_1: 1
fluxval_1: V=14.01
!
! end of fixed targets
! No solar system records found
! No generic target records found
exposure_logsheet:
linenum: 1.000
sequence_1: DEFINE
sequence_2: THERMAL
targname: THERM1
config: FGS
opmode: POS
aperture: 3
sp_element: PUPIL
num_exp: 1
time_per_exp: 3M
fluxnum_1: 1
priority: 1
param_1: DATA-RATE=32
param_2: LOCK=0.85
param_3: ACQ-DIST=10
req_1: CYCLE 1 / 1.0-49.0;
req_2: SEQ 1-2 NON-INT;
req_3: CRITICAL OBS;
req_4: NON-INT;
!
linenum: 2.000
sequence_1: DEFINE
sequence_2: THERMAL
targname: THERM1-1-REF
config: ^
opmode: ^
aperture: ^
sp_element: ^
num_exp: ^
time_per_exp: 3M
fluxnum_1: ^
priority: 1
param_1: ^
param_2: ^
param_3: ^
req_1: NON-INT;
req_2: DO FOR TARGETS 2-4;
!
linenum: 3.000
sequence_1: USE
sequence_2: THERMAL
req_2: SEQ 3-49 NO GAP;
comment_4: TARGET VISIBILITY PERIOD.
comment_5: TERMINATE TEST AFTER 7 ORBITS.
!
linenum: 4.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 5.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 6.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 7.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 8.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 9.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 10.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 11.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 12.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 13.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 14.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 15.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 16.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 17.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 18.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 19.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 20.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 21.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 22.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 23.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 24.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 25.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 26.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 27.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 28.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 29.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 30.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 31.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 32.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 33.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 34.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 35.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 36.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 37.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 38.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 39.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 40.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 41.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 42.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 43.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 44.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 45.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 46.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 47.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 48.000
sequence_1: USE
sequence_2: THERMAL
!
linenum: 49.000
sequence_1: USE
sequence_2: THERMAL
!
! end of exposure logsheet
! No scan data records found