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GSC-II and DSS-II ProjectsGSC-II and DSS-II Projects2001 Annual Report2001 Annual Report

Brian McLean22nd October 2001

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Project GoalsProject Goals

Provide products/tools to increase efficiency of telescope operations and observation planning.

ALL-SKY Will support HST, GEMINI, VLT, TNG and NGST

Digitize available Schmidt Survey photographic plates Distribute 10x compressed images to community

Build object catalogues from images Positions, Proper motions, Magnitudes, Colors,

Classification Distribute to community

Provide access tools to images and catalogue. Enable use for observing and science

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Community PartnershipCommunity Partnership

STScI recognized center for sky surveys.

GSC-I DSS-I

Created international consortium to develop and complete DSS-II and GSC-II projects.

Collaborations Palomar/AAO ESO/ST-ECF,CADC SDSS science archive Tycho GAIA

Institution DSS-II GSC-II

Space Telescope -European Coordinating Facility

  X

European Space Agency - Astrophysics division

  X

European Southern Observatory X X

Osservatorio Astronomico di Torino   X

International GEMINI project X X

Canadian Astronomical Data Center X

Centre de Donnee Stellaire X  

Anglo-Australian Observatory X  

Royal Observatory Edinburgh X  

National Astronomical Observatory Japan

X  

Beijing Astronomical Observatory X  

Palomar Observatory X  

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DSS-II OverviewDSS-II Overview

Scan new survey plates from the Palomar and UK Schmidt telescopes

All-sky, minimum 3 bandpasses (J, F, N) 15 ”) sampling, 23040x23040 pixels of 1.2 GB each

STScI scan archive FITS images on MOD (8TB)+8mm tape backup 10x compressed images on-line in MAST

CDROM jukeboxes being replaced by NAS RAID array

10x images distributed to ESO, CADC, CDS, NAOJ, BAO, ROE, GEMINI and Australian consortium.

Photometric and astrometric calibration of all images calibrations provided in image headers

Survey Number Plates (7952)

POSS-I E 880

POSS-I O 880

Pal-QV 614

POSS-II J 897

POSS-II F 897

POSS-II N 897

SERC-J/EJ 894

SERC-QV 90

PPARC-ER 288

AAO-SES 606

AAO-GR 109

UKSTU-IR 894

Special XX 6

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Survey Epoch Plate/ Filter Band Depth Scanned CDROM Notes Pal-QV 1983-85 I I aD+W12 V 19.5 100% 100% 1,3

SERC-J 1975-87 I I I aJ +GG395 BJ 23.0 100% 100% 1,2,6

SERC-EJ 1979-88 I I I aJ +GG395 BJ 23.0 100% 100% 1,2,6

POSS-I E 1950-58 103aE+red R 20.0 100% 100% 2

POSS-I O 1950-58 103aO B 21.0 30% 0% 5

POSS-I I J 1987-00 I I I aJ +GG385 BJ 22.5 100% 100%

POSS-I I F 1987-99 I I I aF+RG610 R 20.8 100% 100%

POSS-I I N 1987-xx I V-N +RG9 I 19.5 98% 69%

AAO-SES 1990-00 I I I aF+OG590 R 22.0 100% 100%

SERC-ER 1990-xx I I I aF+OG590 R 22.0 100% 100%

SERC-I 1990-xx I V-N +RG715 I 19.5 75% 75%

Summary of Plate Scans

Notes to the First Generation Table. All scans (except POSS-I O plate) were made with 25 m (1.7”) sampling. [1] Used in the GSC-I. [2] These scans are part of the 102 volume CD set distributed as DSS-I. [3] Not published, but available on the STScI network server. [4] Plans include completing the -18, -24, and -30 degree zones as time permit. [5] Selected fields only. [6] About 150 J/EJ fields at the lowest latitudes are also being rescanned with 15 m sampling.

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GSC-II OverviewGSC-II Overview

All-sky catalogue of positions, proper motions, magnitudes and colours

Use all available images : DSS-I/DSS-II images + unpublished (QV,XO)

complete to a minimum of V=18 (Goal is plate limited) GSC-II will have ~5 billion entries for ~ billion objects GSC-II project is partially funded by external partners

OATo, GEMINI, ESA/ST-ECF and ESA/SA Receive prepublication data access for telescope

operations and science projects

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GSC-II SpecificationsGSC-II Specifications

Positions < 0.50”absolute; average across a single plate; < 0.20” relative,

over 1/2o field < 0.15”adherence to ICRS reference frame, average over all plates

Proper Motions Errors due to limited time baseline between observation epochs typically 5-30 mas/year in North and 20-40 mas/year in South

Photometry 0.2mag error between 12-18 magnitude

Classification: 95% accuracy within two magnitudes of plate limit

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Improved Reference CataloguesImproved Reference Catalogues

Astrometric Reference catalogues TYCHO - 2 ICRS reference frame Now precision is limited by measurement error

Photometric Reference catalogues Obtaining CCD sequences (14-18 magnitude) for all

survey plates Second Guide Star Photometric Catalogue (GSPC-II) 95% sky observed

Classification Training sets Availability of deep CCD catalogues over significant

area Tools to allow visual classification of objects from plates

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Improved Plate ProcessingImproved Plate Processing

Improved software system to process images Sky determination and Object detection, improved deblending Position calibration using Tycho-2 (ICRS) Derived systematic corrections (Masks and Filters) Magnitude calibration using GSPC-II Improved vignetting function and derived emulsion sensitivity

variations. Object classification using decision tree based on ranked object

features All objects loaded into commercial object-oriented database

(Objectivity) Database designed to support recalibration

Use best available calibration during plate processing Recalibrate within database as algorithms/plate modeling/etc

improved

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2001 Highlights2001 Highlights

GSC 2.2.n deliveries Public release Internal science version

DSS-II Plate scanning is approaching completion POSS-II completed

UKSTU obtained observable missing fields UKSTU SES, ER and IV-N close to completion

‘B’ grade plates for ALL remaining southern fields Continued scanning IV-N plates and started POSS-I O

Processing begun for IV-N plates Expansion of disk space for COMPASS

3.6TB on-line for ooDB files STScI will host SDSS public archive

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2001 Lowlights2001 Lowlights

Schedule slip GSC 2.2 delivered 3 months behind schedule

Resource reductions Staffing – Garcia, Laidler, Morrison,Wolfe GSC 2.3 Schedule impact?

Objectivity limitation DB pagefile issue will require DB rebuild

7 Missing POSS-II IV-N fields

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Catalog Release HistoryCatalog Release History

GSC 2.0 January 1999 Sky coverage prioritized for GEMINI SV, HST BOP Two-passbands (J,F), without proper motions Deliverable to GEMINI and ESO/VLT only

GSC 2.1.0 March 2000 Same as GSC 2.0, but with available sky coverage Preliminary application of astrometric masks

GSC 2.1.1 August 2000 Same as GSC 2.1.0, increased sky coverage Improved Photometric calibration with GSPC 2 Improved Astrometric calibration with Tycho 2

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Catalog Releases in 2001Catalog Releases in 2001

GSC 2.2.0 June 2001 99.9% complete sky coverage in 2 passbands to J=18.5 Computed error fields Initial community release (www, data-centers)

GSC 2.2.01 July 2001 Complete sky coverage in 2 passbands to J=18.5 Corrections to TYCHO entries

GSC 2.2.1 August 2001 Complete sky coverage to plate limit Internal consortium release for science and QA

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Planned Catalog ReleasePlanned Catalog Release

GSC 2.3 June 2002 ? Adds available XE, XO, QV plates + IR (XI, XN) Proper motions computed Reclassification with final decision trees Add links to Skymap, 2MASS, SDSS Improved precision, etc., depending on resources

final astrometric masks and magnitude equation and vignetting

Galaxy photometry Improved global error analysis and removal of

systematic errors• colour corrections• proper motion corrections

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Goals for this meetingGoals for this meeting

Celebrate GSC 2.2 Identify all critical issues related to GSC 2.3

Completion of calibration tasks GSPC 2.3 Magnitude equation Multi-plate tasks Galaxy photometry ReClassification

QA Export catalog format GSC-II paper(s)

SCIENCE PR plans

Microsoft Project Document

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SummarySummary

GSC 2.2 is already a success Satisfies requirements for telescope pointing

Project approaching completion Solid infrastructure

Scanning, Processing, COMPASS, GSPC-II BUT a lot of work remaining with limited resources

GSPC-II, Recalibration/Reclassification,QA Need to keep focused on final goal

Continue collaborative efforts STScI – production OATo – QA and Science ESO/GEMINI – Ops/Science feedback

Application