Design and Implementation ofthe Japanese VirtualObservatory (JVO) system
Yuji SHIRASAKI
National Astronomical Observatory of Japan

2008-08-04

APRIM 2008, Kunming, Yunnan, China

1Introduction
 What can you do on Japanese Virtual Observatory (JVO) ?
 Web portal to the Astronomical Data
 On-line data visualization
 Simple and Easy Subaru data reduction

 Who can use the JVO
 Anyone can use the most of the functionality (Guest)
 Registered user can have a permanent storage area on the JVO andcan submit a job for Subaru data reduction. (Astro. study only) How can you access to the JVO
 http://jvo.nao.ac.jp/portal
 Search on google with a keyword “JVO”
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Why we develop the JVO
 Many astronomical data sites in the world
 many are unnoticed even though they provide good data need a broker system ( portal site ) Server side web service vs stand-alone application
 UI

is a Web browser: very familiar and easy to use.
 Always provide the most recent feature.
 Doesn’t require high-spec PC.
 Increase the usability of the Subaru data especially of Suprime-Cam Data reduction of large format data is time-consuming.
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IVOA Standards
 Registry Data service discovery
 Metadata exchange and search

 SIAP/SSAP/SkyNode/SCS Database query interface

 VOTable
 Table data transport format…
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Architecture
GridSystem

LDAP

解析
解析
解析
Analysis
ServersAuth.
SDSS

SubaruArchive

InvokeMDS

SkyNode1.0

Portal…
Web Service
HTTP Get
FTP
LDAPP. Reg.

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UserStorage

QSO
Subaru2MASS

Data Service

S. Reg.

Other VOsRegistry

P. Reg.

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SIAP/SSAP

SkyNode0.7.4
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Metadata exchange in the VO
SearchableRegistry② Harvest(collection)
MetadataMetadata• identifier of the service• access URL• contents (star, galaxy, AGN, ...)
• spectrum coverage• ...

① Registration
Analysis
ServiceOAI-PMH
SOAP/WS
Publishing
Registry③ Discovery
VODataService2008-08-04

Storage
ServiceAPRIM 2008, Kunming, Yunnan, China

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JVO SkyNode toolkit
 SkyNode toolkit is developed to help people whowant to open their own data to the VO.
 Enables to expose the content of the local
database thorough the VO standard interface
 SkyNode (will be replaced by TAP) SIAP SSAP http://jvo.nao.ac.jp/download/skynode-toolkit

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Loginhttp://jvo.nao.ac.jp/portal

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10TopPage
Data searchby several
types of UI

Servicesearch by
severaltypes ofUI

User
registration

Access to the reduced
Subaru data and data
reduction service forSuprime-Cam

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VO Data Service Search
 VO Service Registered in the JVO Registry 1967 Resource Metadata as of 2008-08-01
 12 countries
 USA, France, Canada, Italy, UK, Brazil, Australia, Spain, Mexico,ESA, China, and Japan

 Harvest once a day from 6 sites (STSCI, NCSA, GSFC,CDS, ESAC, JVO)

 Search Interfaces for JVO Registry Keyword Search Directory (Category) Search Search by Detailed Condition
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UI for JVORegistry2008-08-04

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Parallel Search• Only asearch region
can bespecified• Query to themultiple VO
services by
one click !

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Search Status
for ParallelSearch• over 1,000 data
resources are
queried at once.
• impossible to do
this by hand !
• Takes ~ 10minutes tocomplete

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Quick Search

Currently SDSS (DR6) + TWOMASS.
More Catalogs will be injected !

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APRIM 2008, Kunming, Yunnan, China• QI for the VirtualUniverse• Single Databasefrom multiple
catalogs• Only RA, Dec,Brightness• Quick Region
Search algorism
is employed• 0.8 sec forthousands ofobjects fromthree billions
objects
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Searchwith adetailedcriterion• Single VO Service• Criteria on each
attribute• Uniform QI for
every VO service

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VOTable Viewer

save and download
in a csv, text, or
votable format

SED Plot of eachgrouped object &Finding Chart• filtering based ona constraint for thecolumn values• grouping bycelestial coordinate
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VOTable Viewer

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VOTable Viewer

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JVO Plot

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Subaru Data Service
 Provides reduced Subaru data Mosaic image for Suprime-Cam
 Reduced 1D spectrum of HDS

 Data reduction by your own criteria
 Mosaic service for Suprime-Cam Doesn’t require detailed knowledge about Subaru
 No installation of any software on your PC is required Just click and wait about one hour

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Mosaic image for 1883
data sets< 1.2” for 1749 set< 1.0” for 1542 set< 0.8” for 1082 set

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Astrometric Calibration Error
0.32”

1.26” (99%)

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Access Statistics
1TB

Start of officialoperation
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Summary JVO Portal provides an integrated astronomical

research environment
 Web browser as an user friendly UI
 Data access with the IVOA standard Huge amount of computing/storage resource areavailable http://jvo.nao.ac.jp/portal http://jvo.nao.ac.jp/download/skynode-toolkit
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