A 1% Measurement of the Distance Scale with Perpendicular Spatial Scanning
We propose to measure the distance scale to 1% precision using a new capability of HST, thereby paving the way for a 1% measurement of the Hubble constant. Perpendicular spatial scanning with WFC3 can improve the precision of relative astrometry for parallax measurements by an order of magnitude over the previous best attained with point-and-stare imaging or by use of the Fine Guidance Sensor. We successfully demonstrated this capability with a Cycle 19 test program, measuring the position of bright Milky Way Cepheids to an unprecedented precision of 20 micro-arcseconds for optical sources. The leverage afforded by the technique can be used to extend the useful range of optical trigonometric parallax measurements to 1-3 kpc to collect a sample of long-period Cepheids, analogues of the Cepheids observable by HST in the nearest hosts of Type Ia supernovae. We propose to measure the distances to 11 Galactic Cepheids and obtain the photometry of these Cepheids on the same photometric system as distant Cepheids to eliminate zeropoint errors in the determination of H_0. Our program will establish a new technique to benefit a wide range of programs while advancing the investigation of unknowns in the present cosmological model by connecting the distance scale from the CMB to the present.
Continuation of 12879
COSMOLOGY
12
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This object was generated by the targetselector and retrieved from the SIMBAD database.
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This object was generated by the targetselector and retrieved from the SIMBAD database.
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This object was generated by the targetselector and retrieved from the SIMBAD database.
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This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
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This object was generated by the targetselector and retrieved from the SIMBAD database.
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J2000
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This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
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This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
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This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
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This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
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This object was generated by the targetselector and retrieved from the SIMBAD database.
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Imaging
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WFC3/IR
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WFC3/IR
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Spectroscopic
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WFC3/IR
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Imaging
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Imaging
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WFC3/UVIS
Imaging
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WFC3/UVIS
Imaging
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WFC3/UVIS
Imaging
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WFC3/IR
Imaging
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WFC3/IR
Spectroscopic
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WFC3/IR
Imaging
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WFC3/IR
Imaging
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WFC3/UVIS
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Imaging
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WFC3/UVIS
Imaging
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WFC3/UVIS
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WFC3/UVIS
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WFC3/UVIS
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WFC3/UVIS
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WFC3/UVIS
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WFC3/IR
Imaging
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WFC3/IR
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WFC3/IR
Imaging
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Imaging
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Imaging
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Imaging
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Same guide star set used in 12879
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The scheduling data was generated by CASM 21.2.
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Same guide star set used in 12879
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Same guide star set used in 12879
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The scheduling data was generated by CASM 21.2.
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Same guide star set used in 12879
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The scheduling data was generated by CASM 21.2.
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Same guide star set used in 12879
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The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
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The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1390453849000
61.0
(Tic-Visit
:proposal-id 13344
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:saa-model "29"
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:data-volume 1660240
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:coron NIL
)
(Tic-Obset
:proposal-id 13344
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:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "10"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2969
:al-overhead-at-end 0
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1390680105000
337.0
(Tic-Visit
:proposal-id 13344
:visit-id "11"
:proposal-version -1
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:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
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:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "11"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2895
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1391448756000
346.0
(Tic-Visit
:proposal-id 13344
:visit-id "12"
:proposal-version -1
:trans-version "20130502"
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:trans-errors '(:WARNINGS 6 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1430576
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "12"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2771
:al-overhead-at-end 0
:internal-dur-at-end 462
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1391904861000
70.0
(Tic-Visit
:proposal-id 13344
:visit-id "13"
:proposal-version -1
:trans-version "20130502"
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:trans-errors '(:WARNINGS 5 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1588080
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
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:obset-id "13"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "13"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2864
:al-overhead-at-end 0
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3491
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1397724330000
110.0
(Tic-Visit
:proposal-id 13344
:visit-id "14"
:proposal-version -1
:trans-version "20130502"
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:trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0
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:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "14"
:obset-id "14"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "14"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2910
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3253
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1397632499000
116.0
(Tic-Visit
:proposal-id 13344
:visit-id "15"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:01:10.0"
:trans-errors '(:WARNINGS 8 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1597232
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "15"
:obset-id "15"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "15"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2982
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3253
:pcs-gap 0
)
false
1
1
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1396373435000
280.0
(Tic-Visit
:proposal-id 13344
:visit-id "16"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:01:12.0"
:trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "16"
:obset-id "16"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "16"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2831
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3233
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1400818800000
243.0
(Tic-Visit
:proposal-id 13344
:visit-id "17"
:proposal-version -1
:trans-version "20140319"
:date "09-May-2014 05:43:58.0"
:trans-errors '(:WARNINGS 6 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1367568
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "17"
:obset-id "17"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "17"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2795
:al-overhead-at-end 0
:internal-dur-at-end 472
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3267
:pcs-gap 0
)
true
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
1401042434000
252.0
(Tic-Visit
:proposal-id 13344
:visit-id "18"
:proposal-version -1
:trans-version "20130502"
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:trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1452896
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "18"
:obset-id "18"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "18"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2798
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3377
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
(Tic-Visit
:proposal-id 13344
:visit-id "19"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:01:16.0"
:trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "19"
:obset-id "19"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "19"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2996
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
(Tic-Visit
:proposal-id 13344
:visit-id "20"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:01:18.0"
:trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "20"
:obset-id "20"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "20"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 3023
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
(Tic-Visit
:proposal-id 13344
:visit-id "21"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:01:20.0"
:trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "21"
:obset-id "21"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "21"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2901
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
(Tic-Visit
:proposal-id 13344
:visit-id "22"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:08:10.0"
:trans-errors '(:WARNINGS 6 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1380640
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "22"
:obset-id "22"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "22"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2818
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3511
:pcs-gap 0
)
false
1
0
The scheduling data was generated by CASM 21.2.
CASM was run in Phase II mode.
Same guide star set used in 12879
(Tic-Visit
:proposal-id 13344
:visit-id "23"
:proposal-version -1
:trans-version "20130502"
:date "17-Jun-2013 16:01:23.0"
:trans-errors '(:WARNINGS 4 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1525072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 13344
:visit-id "23"
:obset-id "23"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 13344
:visit-id "23"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2888
:al-overhead-at-end 0
:internal-dur-at-end 678
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3491
:pcs-gap 0
)
false
1
0