1. 6 th Annual GSC-II Project Meeting C B A S GSC-II and DSS-II Projects 2000 Annual Report Brian McLean 19 th October 2000

2. 6 th Annual GSC-II Project Meeting C B A S Project Goals NProvide products/tools to increase efficiency of telescope operations and observation planning. N ALL-SKY N Will support HST, GEMINI, VLT, Galileo and NGST NDigitize available Schmidt Survey photographic plates N Distribute 10x compressed images to community NBuild object catalogues from images N Positions, Proper motions, Magnitudes, Colors, Classification N Distribute to community NProvide access tools to images and catalogue.

3. 6 th Annual GSC-II Project Meeting C B A S DSS-II Overview NScan new survey plates from the Palomar and UK Schmidt telescopes N All-sky, minimum 3 bandpasses (J, F, N)  15  ”) sampling, 23040x23040 pixels of 1.1 Gbyte each  Older 25  scans to be replaced as resources permit NSTScI/CASB scan archive N Magneto-optical discs N 8mm tape backup N Eventual goal to ingest image archive into STScI DADS system on DVD NPhotometric and astrometric calibration of all images N calibrations provided in image headers

4. 6 th Annual GSC-II Project Meeting C B A S DSS-II Overview (continued)  Distribute 10x compressed DSS  II images to participating institutions N STScI, ESO, CADC, CDS, NAOJ, BAO, ROE, and Australian consortium. N Two sets also to be made for the GEMINI telescopes N Disk replication by collaboration with CADC colleagues NAll compressed image data available on-line N preliminary data on STScI and other webservers N CADC, ESO, NAOJ NLarge-scale community distribution at end of project N Tentatively by printing about 500 sets on DVD (or other new technology)

5. 6 th Annual GSC-II Project Meeting C B A S Summary of First-Epoch Plate Scans for use in GSC-II and for general reference 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.

6. 6 th Annual GSC-II Project Meeting C B A S Status of Second-Epoch Plate Scans for DSS-II and GSC-II Notes to the Second Generation Table. Statistics estimated as of Oct 1, 1999. All scans on this page were made with 15 m (1”) sampling. The POSS-II surveys each cover the northern hemisphere (centers in +90>d>0) in 894 fields. The SERC ER covers the southern equatorial zone (centers in -15<d<0) in 288 fields, and the AAO SES (Second Epoch Survey) covers the remainder of the south in 606 fields. About 100 supplemental short exposure special plates taken in crowded fields are not listed in the table.

7. 6 th Annual GSC-II Project Meeting C B A S GSC-II Overview NAll-sky catalogue of positions, proper motions, magnitudes and colours N Use all available images : DSS-I/DSS-II images + unpublished (QV,XO) N complete to a minimum of V=18 (Goal is plate limited) NGSC-II will have ~10 billion entries for ~2 billion objects NGSC-II project is partially funded by external partners N OATo, GEMINI, ESA/ST-ECF and ESA/SA N Receive prepublication data access for telescope operations

8. 6 th Annual GSC-II Project Meeting C B A S GSC-II Overview (continued) NPositions  < 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 NProper Motions N Errors due to limited time baseline between observation epochs N typically 5-30 mas/year in North and 20-40 mas/year in South NPhotometry N 0.2mag error between 12-18 magnitude NClassification: N 95% accuracy within two magnitudes of plate limit

9. 6 th Annual GSC-II Project Meeting C B A S Improved Reference Catalogues NAstrometric Reference catalogues N TYCHO - 2 N ICRS reference frame N Now precision is limited by measurement error NPhotometric Reference catalogues N Obtaining CCD sequences (14-18 magnitude) for all survey plates N Second Guide Star Photometric Catalogue (GSPC-II) N 95% sky observed NClassification Training sets N Availability of deep CCD catalogues over significant area N Tools to allow visual classification of objects from plates

10. 6 th Annual GSC-II Project Meeting C B A S Improved Plate Processing NImproved software system to process images N Sky determination and Object detection, improved deblending N Position calibration using Tycho-2 (ICRS) N Derived systematic corrections (Masks and Filters) N Magnitude calibration using GSPC-II N Improved vignetting function and derived emulsion sensitivity variations. N Object classification using decision tree based on ranked object features N All objects loaded into commercial object-oriented database (Objectivity) N Database designed to support recalibration N Use best available calibration during plate processing N Recalibrate within database as algorithms/plate modeling/etc improved

11. 6 th Annual GSC-II Project Meeting C B A S Highlights NDSS-II Plate scanning is approaching completion N POSS-II J and F surveys completed N UKSTU SES and ER close to completion N N+S IV-N surveys now weather limited N Began scanning Southern IV-N plates NESA/ECF plate processing agreement completed N Higher throughput than expected (~2150 plates) NPlate processing completed for available GSC 2.2 plates NRecalibration N operational GSPC 2.2 and Tycho 2 N Astrometric masks implemented + improved vignetting NGSC 2.1.n deliveries

12. 6 th Annual GSC-II Project Meeting C B A S Highlights NNew Database server system for operational DB N 4x500Mhz cpu’s, 2GB memory, N H/W RAID, 8 channels on 64-bit PCI bus N MUCH faster I/O bandwidth (40-50 Mb/s) NExpansion of disk space for COMPASS N 1.8TB on-line for ooDB files NHierarchical Storage Management software was replaced NDLT jukebox for auxiliary file management NCommunity cooperation in developmental areas N HTM, Virtual Observatory, visualization NGSPC-II paper

13. 6 th Annual GSC-II Project Meeting C B A S Lowlights NResource reductions N Vacant scientist position lost N Reallocation of 0.25 FTE to NEXUS/NGST work N End of George Hawkins contract N End of ST-ECF contract N Consequences N De-scoped QA for GSC 2.2 release N Deferred classification improvements for GSC 2.3 N Deferred relative proper motion for GSC 2.3

14. 6 th Annual GSC-II Project Meeting C B A S Lowlights NDatabase load delays N HW problems with installation of RAID array N New Hierarchical Storage Management software still had operational difficulties with ooDB files. N Delayed database load when disks were full N Technical difficulties with 2 nd jukebox N Technical difficulties with installation of DLT jukebox and backup software to automate backups N Manual backups took 8-10 days N These problems increased manual operator intervention N Consequences N ~3 month schedule slip N Deferred POSS-I, QV plates till GSC 2.3

15. 6 th Annual GSC-II Project Meeting C B A S Catalog Releases NGSC 2.0delivered N Sky coverage prioritized for GEMINI SV, HST BOP N Two-passbands (J,F), without proper motions N Deliverable to GEMINI and ESO/VLT only NGSC 2.1.0delivered N Same as GSC 2.0, but with available sky coverage N Preliminary application of astrometric masks NGSC 2.1.1delivered N Same as GSC 2.1.0, increased sky coverage N Improved Photometric calibration with GSPC 2 N Improved Astrometric calibration with Tycho 2

16. 6 th Annual GSC-II Project Meeting C B A S Catalog Releases NGSC 2.2January 2001 N Complete sky coverage in 2 passbands N Compute error fields N Initial community release (www, data-centers) NGSC 2.3January 2002 N Adds available XE, XO, QV plates + IR (XI, XN) N Proper motions computed N Reclassification with final decision trees N Improved precision, etc., depending on resources N final astrometric masks and magnitude equation and vignetting N Galaxy photometry N Improved global error analysis and removal of systematic errors N colour corrections N proper motion corrections

17. 6 th Annual GSC-II Project Meeting C B A S Goals for this meeting NIdentify all critical issues related to GSC 2.2 and 2.3 deliverables N Completion of calibration tasks N Multi-plate tasks N Magnitude equation N GSPC 2.2 and 2.3 N Galaxy photometry N Derivation of final Classification decision trees N QA N GSC-II paper(s) NSCIENCE NPR plans

18. 6 th Annual GSC-II Project Meeting C B A S Project Schedule

19. 6 th Annual GSC-II Project Meeting C B A S Summary NWidespread use and success of DSS-I and GSC-I for telescope operations prompted development of DSS-II and GSC-II for next-generation telescopes. NApproaching completion and not far behind schedule. N “The end is in sight!” NSTScI is committed to the “Virtual Observatory” N Recognize importance and scientific value N DSS-II and GSC-II will be major datasets (+SDSS,2MASS,FIRST,etc)