TIPS Meeting
17 April 2003, 10am, Auditorium
1. Cycle 12
Bob Williams
2. Using GSC-2 to select
guide stars for JWST
Jerry Kriss
Next TIPS Meeting will be held on 15 May 2003.
HST Cycle 12
TAC Results
Bob Williams
TIPS – 17 April 2003
TAC Review Committee
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“We find no fundamental flaws in the process or
unwarranted influence by STScI staff or management.”
“ We also attest to the overall integrity of the TAC
process “
“The committee panel was impressed by the efficacy of
the process for awarding time on HST, and the role of
the STScI in organizing and supporting complex and
challenging TAC procedures that we judge to be fair and
unbiased.”
TAC Review Committee
Recommendations
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Each proposal should be reviewed by at least one expert
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Institutional conflict of interest rules should be eased
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Collective memory of TACs should be retained through repeat panelists
over consecutive cycles
Written feedback on the evaluation of all proposals should be provided to
PI’s
Encourage participation in Treasury Program by organizing annual
workshops for development and coordination of large HST programs
Cycle 12 Timeline
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Reduction in time between proposal submission
and cycle observations by ~ 4 months
´ Opportunity
to follow up on scientific discoveries
´ ‘Fresher’ science programs
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Deadline was January 24 (from September 7)
11 review panels met 24-26 March
TAC met 27-29 March
Director’s Review April 3, PI notification April 4
Phase II deadline: Mid-May
Nominal Cycle 12: July 2003 - June 2004
Cycle 12 Overview
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1,046 proposals received:
-19,674 orbits requested
•
Plus: 1860 [Cyc13] & 855 [Cyc14]
-6,067 SNAP targets
-$13.2 M AR funding (including Theory)
Oversubscription by Cycle
9.00
GO Proposal oversubscription
GO Orbit oversubscription
AR Funding oversubscription
8.00
7.00
Oversubscription Ratio
6.00
5.00
4.00
3.00
2.00
1.00
0.00
1
2
3
4
5
6
7
Cycle
7N
8
9
10
11
12
Review Process
ß
Panels select small/medium proposals (2000 orbits)
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Panels review large programs for TAC
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TAC selects Treasury/Large programs (1000 orbits)
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Duplicate panels minimize conflicts and maximize attendance and
participation by all panelists
New and continued features since
Cycle 11
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TAC met after panels- NEW
´ Panels
provided input on Large/Treasury
programs via Chairs
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“Progressive subsidy” for Regular proposals MODIFIED
Chandra allocation for multi-wavelength
programs
NOAO allocation for supporting ground-based
observations
Types and Sizes of Proposals
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GO - orbits
´ Large
(100 or more orbits)
´ Regular (1-99 orbits)
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AR and Theory - funding
SNAP - targets
´ one
visit = one target
´ no links, no guarantees
´ probability of execution ~50%
Proposal categories
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Treasury
´
´
´
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AR Legacy
´
´
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Provide datasets for lasting value to HST program
Should focus on potential to solve multiple problems
Provide enhanced data products
Provide homogeneous set of calibrated data
Should enable new and important science
(AR) Theory
´
´
Direct relevance to HST observational research
Mission-specific favored over general theory programs
Other Categories
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Long-term Programs
´ Cycle
12 TAC/Panels may award Cycle 13+14 time
(~5%) where required by science.
´ (No proposal resubmission in those cycles)
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Target-of-Opportunity (TOO) Proposals
´ 1-2
ultra-fast (< 2 days) activations (15 orbit
overhead)
´~
6 rapid (< 2 weeks) activations allowed
´~
20 TOO activations (> 2 weeks)
Cycle 12 Summary
ß
GO Acceptance Rate: ~1/5 for proposals and ~1/6 for orbits
ß
SNAP Acceptance rate: ~1/3.5 for proposals and targets
ß
AR Acceptance rate: ~1/2.6 for proposals and dollars
ß
Theory Acceptance rate: ~1/4.2 for proposals and ~1/4.6 for dollars
ß
AR Legacy Acceptance rate: 0 approved
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GO proposals acceptance rate approximately independent of size.
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28.7% of program awarded to Large/Treasury Programs.
ß
Instrument breakdown for GO Programs: ACS (55%), STIS (23%), NICMOS
(21%), WFPC2 (2%), FGS (5%)
ß
ESA acceptance fraction 16.8% for proposals and 10.2% for orbits
Cycle12 Summary (Cont.)
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$2.97M awarded to Regular AR programs
$680K awarded to Theory programs
Proposal acceptance fraction similar for panelists and nonpanelists
Proposal acceptance fraction similar for STScI staff & community
Chandra: accepted 3 out of 25 proposals, or 115 ksecs out of 1444
submitted
NOAO: accepted 7 out of 15 proposals, or 17.5 nights out of 41.5
submitted
Calibration: 2 AR for $130K and 3 GO for 12 orbits approved
ToO’s: approved 1 ultra-fast (< 2 days) + 2 fast (< 2 week) + 8 other
Summary Results
Proposals
RequestedApproved% AcceptedESA Accepted ESA %
GO
819
170
20.8%
28
16.5%
Snapshot
74
21
28.4%
4
19.0%
Archival
111
41
36.9%
Theory
42
10
23.8%
Total
1046
242
23.1%
32
16.8%
Primary Orbits
19674
3154
16.0%
323
10.2%
Includes 0790.bahcall (48 orbits) and 0314.webster (30 orbits) and 12 calibration orbits
Acceptance Fraction by Size
100.00%
90.00%
Proposals
Orbits
80.00%
70.00%
60.00%
50.00%
40.00%
83
30.00%
38
20.00%
26
8
6
4
4
10.00%
0.00%
1 - 10
11 - 20
21 - 30
31 - 40 41 - 50
Orbit Bins
51 - 100
>100
Overall
Orbit Size by Cycle
35
Median Submitted
Median Approved
Average Submitted
30
Average Approved
Orbit Size
25
20
15
10
5
0
6
7
7N
8
9
Cycle
10
11
12
STScI Acceptance Resources
Submitted
Approved
Approved
Fraction
Fraction of
Cycle
Approved
AR
$492K
(6)
$60K
(1)
12.2%
2%
Theory
$472K
(7)
$90K
(1)
19%
13.1%
Orbits
2573
(73)
424
(20)
16.5%
13.4%
Snap
Targets
460
(5)
40
(1)
9%
2.3%
STScI Proposal Acceptance
100%
STScI Acceptance Rate
Average Acceptance Rate
Fraction of Program
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
5
6
7
7N
7AR
Cycle
8
9
10
11
12
GO Instrument Summary
Requested
Instruments Orbits
ACS/HRC
1914
ACS/SBC
266
ACS/WFC
11727
FGS
578
NIC1
427
NIC2
1866
NIC3
1471
STIS/CCD
1475
STIS/FUV
2743
STIS/NUV
1516
WFPC2
1919
25902
%
7.4%
1.0%
45.3% 53.7%
2.2%
2.2%
1.6%
7.2%
5.7% 14.5%
5.7%
10.6%
5.9% 27.8%
7.4%
7.4%
100.0%
Approved
Orbits
251
19
2640
268
183
597
342
333
433
126
123
5315
%
4.7%
0.4%
49.7%
5.0%
3.4%
11.2%
6.4%
6.3%
8.1%
2.4%
2.3%
100.0%
Total for
Instrument
54.8%
5.0%
21.1%
23.2%
2.3%
Pure Parallel Instrument Summary
Requeste
Instruments Mode
d Orbits
ACS/WFC
Imaging
700
ACS/WFC
Spectroscopy
300
NICMOS/NIC/3 Spectroscopy
500
WFPC2
Imaging
500
2000
%
35.0%
15.0%
25.0%
25.0%
Approve
d Orbits
0
0
500
0
500
%
0%
0%
100%
0%
Calibration Proposals
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7 Proposals Submitted: 2 AR for $130K and 5 GO
for 33 orbits
´2
—
—
AR and 3 GO approved for 12 orbits
AR: 0433.wyse
0562.dolphin
GO: 0149.odell
0568.dolphin
1233.hines
An astrometric standard field in omega Cen
CTE Corrections for WFPC2 and ACS
Calibration of the ACS Emission Line Filters
ACS Photometric Zero Point Verification
Enabling Coronagraphic Polarimetry with
NICMOS
TREASURY & LARGE PROGRAMS
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Thompson -[T]- 144 orbits
´ Deep
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IR images in CHANDRA Deep Field South
Scoville-[T]-320 orbits Cy 12+320 orbits Cy 13
´ COSMOS
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Riess & Perlmutter -60 orbits each
´ SNIa
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2-Degree ACS survey
Hubble Diagram
Benedict- 60 orbits´ Astrometric
Calibration of Cepheids P-L relation
TREASURY & LARGE PROGRAMS
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Sahu- 110 orbits
´ Galactic
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Malhotra- 40 orbits
´ Grism-
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bulge planetary transit survey
ACS program for extragalactic science
Kochanek- 110 orbits
´ Imaging
of gravitational lenses
TIPS Meeting
17 April 2003, 10am, Auditorium
1. Cycle 12
Bob Williams
2. Using GSC-2 to select
guide stars for JWST
Jerry Kriss
Next TIPS Meeting will be held on 15 May 2003.
Choosing Guide Stars for JWST:
the Suitability of Guide Star Catalog 2 (GSC-2)
Jerry Kriss
With help from:
Jeff Stys
Ed Nelan
Brian McLean
JWST
James Webb Space Telescope
Guide Star Catalog 2
´ Collaborative effort between STScI and the Osservatorio Astronomica di
Torino
´ The COMPASS source database contains ~2 billion stars, galaxies, and other
objects based on measurements of about 6000 sky-survey photographic
plates
´ Three colors: J385 (B band), F610 (R band), and N9/N715 (I band).
´ Official release of GSC-2.2.0 is magnitude-limited to J=19.5, F=18.5, but full
catalog contains objects down to J~22 and F~20. (Only J and F are currently
available.)
´ Above these limits, magnitudes accurate to ~0.15 mag; below, the accuracy
is ~0.5 mag.
´ Positional accuracy is 0.25-0.40 arcsec (11-16 mag), 0.20-0.65 arcsec (>16
mag).
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Concerns over using GSC-2 for JWST
´ GSC-2 is based on visual plate material. The JWST Fine Guidance Sensor
(FGS) will be a near-infrared camera.
´ Catalog completeness as a function of magnitude
´ Catalog contamination fraction as a function of magnitude
´ Photometric accuracy, especially at the faint end, and the reliability of
transforming photographic magnitudes to the infrared.
´ Are there enough stars to assure that JWST can acquire a guide star with
95% probability at any location and any orientation in the field of regard?
(More stringent than HST, ~80% at any given orientation.)
•
•
Facilitates mosaic surveys and multiple repeat visits
•
Simplifies scheduling and operations
Enables multi-instrument follow ups
(common for NIRCam Æ NIRSpec)
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Evaluating GSC-2 using SDSS
´ The Sloan Digital Sky Survey (SDSS) has 5 photometric
bands (u’, b’, g’, r’, i’, and z’) that probe much deeper with
more accurate magnitudes than GSC-2 (22.0, 22.2, 22.2,
21.3, and 20.5) in the five bands.
´ SDSS object classification is highly accurate. To the full
depth of GSC-2, it is essentially 100% correct in
classifying stars vs. galaxies.
´ We used a 2-square degree region at
(a,d)(J2000) = (190.0°, -0.1°) to (192.0°, -1.1°), (l, b) = (301°, +62°)
from the SDSS Early Data Release to compare to GSC-2.
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Classification Accuracy of SDSS
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Evaluating GSC-2 using SDSS
´ The Sloan Digital Sky Survey (SDSS) has 5 photometric
bands (u’, b’, g’, r’, i’, and z’) that probe much deeper with
more accurate magnitudes than GSC-2 (22.0, 22.2, 22.2,
21.3, and 20.5) in the five bands.
´ SDSS object classification is highly accurate. To the full
depth of GSC-2, it is essentially 100% correct in
classifying stars vs. galaxies.
´ We used a 2-square degree region at
(a,d)(J2000) = (190.0°, -0.1°) to (192.0°, -1.1°), (l, b) = (301°, +62°)
from the SDSS Early Data Release to compare to GSC-2.
A NASA
Origins
Mission
´ Objects were matched between the two catalogs using
positional coincidence.
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Positional Errors in GSC-2 vs. SDSS
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Transforming GSC-2 Magnitudes
to the Infrared
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Errors in the Transformation
Dispersion is 0.4 mag
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
Completeness of GSC-2
James Webb Space Telescope
Differential # of Stars vs. Predicted J Magnitude
1600
GSC2/SDSS Stars
GSC2 Stars
1400
SDSS
1200
1000
800
600
400
200
0
9-10
10-11
11-12
12-13
13-14
14-15
Predicted
15-16
Infrared
J
16-17
Magnitude
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
17-18
(bins)
18-19
19-20
20-21
21-22
Completeness of GSC-2
James Webb Space Telescope
Integral # of Stars vs. Predicted J Magnitude
7000
GSC2/SDSS Stars
GSC2 Stars
6000
SDSS
5000
4000
3000
2000
1000
0
9-10
10-11
11-12
12-13
13-14
14-15
Predicted
A NASA
Origins
Mission
15-16
Infrared
16-17
J
17-18
18-19
19-20
20-21
21-22
Magnitude
Using I-band magnitudes when they become available should enhance
completeness by 0.5—1.0 magnitude.
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
The Stellar Population at the
Faint Limits of GSC-2
J = 19
J = 17
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
Contamination Fraction of GSC-2
1400
1200
Unknown
Galaxies
Stars
Total
11.8%
38.6%
1000
4.4%
# of Objects
James Webb Space Telescope
Differential # of Objects vs. J385 Magnitude
800
4.8%
600
2.8%
400
2.9%
4.5%
200
32.0%
12.2%
80.0%
0
13-14
A NASA
Origins
Mission
14-15
15-16
16-17
17-18
18-19
19-20
J385 (1 magnitude bins)
04/17/03
TIPS
Jerry Kriss
20-21
21-22
22-23
Contamination Fraction of GSC-2
5000
Unknown
Galaxies
Stars
Total
4500
14.3%
14.4%
22
23
4000
7.7%
# of Objects (cumulative)
James Webb Space Telescope
Integral # of Objects vs. J385 Magnitude
3500
3000
5.6%
2500
2000
6.3%
1500
7.1%
1000
9.7%
15.0%
500
48.6%
28.1%
14
15
0
A NASA
Origins
Mission
16
17
18
19
J385
04/17/03
TIPS
Jerry Kriss
20
21
James Webb Space Telescope
Meeting the Requirement for a 95%
Probability of Guide Star Acquisition
´ For a 16 Hz sample rate,10 e- read noise, and a required
centroiding accuracy of 2.1 mas per axis, the FGS is likely
to have a limiting magnitude of JAB < 20.
´ GSC-2 is as complete as an IR survey down to JAB~17.4;
for 17.4 < JAB < 20, it is ~75% complete.
´ Contamination rates (primarily due to galaxies) down to
JAB = 20 are ~8%; adding in the ~2% fraction of close
binaries seen by HST implies an overall contamination
rate of ~10%.
´ Given this contamination rate, at least 2, and preferably 3
candidate guide stars should be uplinked for every field
(Isaacs 2001).
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
James Webb Space Telescope
Guide Star Acquisition Probabilities
A NASA
Origins
Mission
04/17/03
TIPS
Jerry Kriss
TIPS Meeting
17 April 2003, 10am, Auditorium
1. Cycle 12
Bob Williams
2. Using GSC-2 to select
guide stars for JWST
Jerry Kriss
Next TIPS Meeting will be held on 15 May 2003.