Web Interface for Star Databases

of the „Pi of the Sky” Experiment

Marek BiskupWarsaw University

On behalf of the „Pi of the Sky” collaboration

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Outline

Star data Interface

Star search Lightcurve view

Summary

Wilga, 2007-05-24 Marek Biskup, Pi Stars Web Interface3

„Pi” Stars

The database „Pi 2004-2005” 11 months of operation 2 cameras ~2 million stars per camera ~200 observations per star => Almost 1 billion of records

(almost 200GB)

Online databases for ongoing observations

Implementation in PostgreSQL

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Other Catalogs Asas – star variability survey Gcvs – variable stars catalogue Tycho – nearly all stars up to 11m

All fits in the same database schema

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Database Schema

Measurements information Additional information about frames, external stars, etc

Star

PK id

ra dec magnitude cam_id ...

Superstar

PK id

name ra dec tycho_id star_class ...

Measurement

time ra dec magnitude ccdx ccdy ...

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Web interface

Modern technologies Php Javascript CSS Smarty DHTML AJAX

Configurable Adaptable for other catalogs

(Tycho, ASAS, GCVS)

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Search form

Change database

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Advanced search

Variability Types

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Search results (1)

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Search results (2)

Limited number of stars per plot

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Interactive searching

Mouse-drawn rectangle

Click on a star to see its light curve

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Light curve viewThe

lightcurveStar’s

properties

Lightcurve form

Advanced properties

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Light curve Different colors mark

different fields of observation

Small dots mark points from the other camera

Other camera

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Interactive light-curvingMouse-drawn

rectangle

Click

Observation properties

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Lightcurve form AJAX-like picture fetching Bookmarking support Data exporting

CVS HTML table ROOT macro

Bad measurement elimination

Field selection

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Switching between star databases

Direct – from the search form

From a light curve view Search by coordinates

(2’ around) Direct link to the same star

in other catalogs

Advanced star’s properties

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Summary

Pi of the Sky has a large Star Database, which will be published soon

Existing star databases are wrapped with the same interface

Star data from all the catalogs can be easily browsed