7 th Annual GSC-II Project Meeting C B A S GSC-II and DSS-II Projects 2001 Annual Report Brian McLean 22 nd October 2001

7 th Annual GSC-II Project Meeting C B A S Project 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

7 th Annual GSC-II Project Meeting C B A S Community 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 InstitutionDSS-IIGSC-II Space Telescope -European Coordinating Facility X European Space Agency - Astrophysics division X European Southern ObservatoryXX Osservatorio Astronomico di Torino X International GEMINI projectXX Canadian Astronomical Data CenterX Centre de Donnee StellaireX Anglo-Australian ObservatoryX Royal Observatory EdinburghX National Astronomical Observatory JapanX Beijing Astronomical ObservatoryX Palomar ObservatoryX

7 th Annual GSC-II Project Meeting C B A S DSS-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 SurveyNumber Plates (7952) POSS-I E880 POSS-I O880 Pal-QV614 POSS-II J897 POSS-II F897 POSS-II N897 SERC-J/EJ894 SERC-QV90 PPARC-ER288 AAO-SES606 AAO-GR109 UKSTU-IR894 Special XX6

7 th Annual GSC-II Project Meeting C B A S 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.

7 th Annual GSC-II Project Meeting C B A S GSC-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

7 th Annual GSC-II Project Meeting C B A S GSC-II Specifications  Positions  < 0.50 ” absolute; average across a single plate; < 0.20 ” relative, over 1/2 o 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 mas/year in South  Photometry  0.2mag error between magnitude  Classification:  95% accuracy within two magnitudes of plate limit

7 th Annual GSC-II Project Meeting C B A S Improved 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

7 th Annual GSC-II Project Meeting C B A S Improved 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

7 th Annual GSC-II Project Meeting C B A S 2001 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

7 th Annual GSC-II Project Meeting C B A S 2001 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

7 th Annual GSC-II Project Meeting C B A S Catalog Release History  GSC 2.0January 1999  Sky coverage prioritized for GEMINI SV, HST BOP  Two-passbands (J,F), without proper motions  Deliverable to GEMINI and ESO/VLT only  GSC 2.1.0March 2000  Same as GSC 2.0, but with available sky coverage  Preliminary application of astrometric masks  GSC 2.1.1August 2000  Same as GSC 2.1.0, increased sky coverage  Improved Photometric calibration with GSPC 2  Improved Astrometric calibration with Tycho 2

7 th Annual GSC-II Project Meeting C B A S Catalog Releases in 2001  GSC 2.2.0June 2001  99.9% complete sky coverage in 2 passbands to J=18.5  Computed error fields  Initial community release (www, data-centers)  GSC July 2001  Complete sky coverage in 2 passbands to J=18.5  Corrections to TYCHO entries  GSC 2.2.1August 2001  Complete sky coverage to plate limit  Internal consortium release for science and QA

7 th Annual GSC-II Project Meeting C B A S Planned Catalog Release  GSC 2.3June 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

7 th Annual GSC-II Project Meeting C B A S Goals 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

7 th Annual GSC-II Project Meeting C B A S Summary  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