Post on 12-Dec-2015
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
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„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