GSC2 Export Catalog

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GSC2 Export Catalog
Gretchen Greene
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General Definition

• All-Sky catalog of unique sources
• Estimated final size 100 GB
• Estimated 2 billion entries
• Challenge what is the final number?
• Object Naming HTM sequential number within
  region
• Traditional to GSC 1 method
• Designed for telescope operations and beneficial
  science
• Result of successful collaboration between OATo,
  STScI, ESO

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Catalog Build Milestones

• GSC 2.0 delivered
• Limited Sky Coverage, select regions for testing
  GEMINI, ESO VLT, HST BOP
• GSC 2.1.0 1/00 delivered
• 800 plates
• GSC 2.1field 5/00 delivered CFA
• GSC 2.1.1 9/00 delivered
• 56 GB binary FITS files
• 1893 plates, assorted bandpasses
• GSC 2.2 1/01
• GSC 2.3 1/02

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Requirements to-date

• Telescope Operations
• ESO, GEMINI
• SkyCat Integration
• Maintainable QA API
• FITS binary files (32768)
• Direct file system mapping from COMPASS
• HTM Level 6 File System
• HTM Level 10, .17, sub indexed
• Achievable, within project resource scope
• Expensive API, ie ALL-SKY LARGE catalog

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Catalog content

• Look at WWW page now

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Content Issues

• Many parameters are non-ideal parameters
• Position and classification selected by first
  plate observation for a given source
• Magnitude perhaps not highest accuracy photometry
• One possible solution select closest plate
  center
• GSC 1.2 currently included
• Missing parameters, PA, e, A
• Different processing, introduces variation in
  accuracy
• External Catalog entries currently not included
• Lacking requirements for official catalog

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User Access

• ESO SkyCat
• Required standard configuration for telescope
  observation tools
• Solaris
• ShowSky tool
• COMPASS access and cross-correlation
• Any platform
• Astronomers Proposal Tool (APT) HST
• WWW Browser command line
• What lies beneath GSC2Query c/cgi
• Simple area query, ie center coord radius
• Selectable magnitude ranges
• Fast, 1sec average seek time

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Proposed new Access Methods

• Jsky
• JAVA version of SkyCat
• Platform independent
• MAST - Multi-Mission Archive at Space Telescope

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Conclusions

• Get the Data out to as many people as possible!
• WWW - WWW WWW - WWW - WWW - WWW
• Need careful review of the content requirements
• Maintain compatibility to previous versions
• Export API modification will require 1 month lead
  time (dev, test, base)
• Estimated time for all-sky GSC 2.2 export 1
  month full tilt
• Final export catalog will hinge on Public Release
  plans