O7.9 Development of Japanese Virtual
Observatory (JVO): Experience on
Interoperation with other Virtual
Observatories and its Future Plan
Masatoshi Ohishi / NAOJ & Sokendai
大石雅寿 / 国立天文台 & 総合研究大学院大学
masatoshi.ohishi@nao.ac.jp

October 4, 2005

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1Data Resources in NAOJ
• Subaru 8.2m Optical-Infrared Telescope• Kiso 105cm Schmidt Camera

Nobeyama 45m• Okayama 188cm Optical Telescope• Nobeyama 45m Radio Telescope• Nobeyama Millimeter Array• Nobeyama RadioheliographSubaru• VSOP• VERA
• ALMA

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Data Resources in JAXA/ISAS• ASCA X-ray astronomy satellite• YOHKO solar physics satellite• Ginga X-ray astronomy satellite• HALCA VLBI satellite• Geotail geomagnetosphere satellite

ASCA• Akebono aurora observation satellite• ASTRO-F Infrared satellite• ASTRO-E2 X-ray satellite
YOHKO• SOLAR-B

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HALCA

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VO Projects in the world• 17 countries and a region• International Virtual Observatory Alliance (IVOA)
Standards to interoperate VOs• Japan – Language to accessfederated DB
http://www.ivoa.net/

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Schematic diagram of JVO
Web Services

Input Queries and Analysis
Parameters

Web Services

Resource Meta-data

Web Services

User
Interface・Query Editor
・VOTable viewer
・DB queries
・Plotter・etc

Controller

SIAP/SSAP/SkyNode・parser・scheduler
・Service caller

User

US/CAN

SIAP/SSAP/SkyNode

Web Services
EuropeOctober 4, 2005

ADASS2005 @ El Escorial, SpainJVO Portal Server5

Integration of standard protocols

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Exchange of Meta Data:OAI-PMH
Searchable Registry
Publishing Registry
Publishing Registry

Query Services
Acserio u savot
ce ss

Data
ServicervicesAnalysis
Service
Virtual Observatory Client

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Schematic diagram of JVO
Web Services

Input Queries and Analysis
Parameters

Web Services

Resource Meta-data

Web Services

User
Interface・Query Editor
・VOTable viewer
・DB queries
・Plotter・etc

Controller

SIAP/SSAP/SkyNode・parser
・scheduler
・Service caller

User

US/CAN

SIAP/SSAP/SkyNodeWeb Services
EuropeOctober 4, 2005

ADASS2005 @ El Escorial, SpainJVO Portal Server8Interconnected VOs in the World

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ADASS2005 @ El Escorial, Spain9Successful Interoperations• Accesses from / toother VOs in Europe
and US have been
available since Dec
2004• Publishing &Searchable Registries• 117 resources areaccessible as of today
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10Elapsed time to querying US VOs
wavelength

Surveyname

servertime(sec)

X-ray

Chandra cda.harvard.edu

1.715

Infrared 2MASS

mercury.cacr.caltech.
edu

3.536

Radioadil.ncsa.uiuc.edu

7.115

VLABest Records -- Some servers may be overloaded from time to time
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JVO is seen from the UK VO

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QSO searches

Such results
can be obtained
only in a few
minutes

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13Performance Improvement• Memory
consumption wastoo large.
• AXIS implementation• Introduced
memory garbage
stable operation
Visit P.105 : Shirasaki et al. for details
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Future Prospects• Started to design / implement operational system– More User-friendly interfaces– Add analysis engines by Java-wrapping– Single-Sign-on, authentication by Grid tool
– Download to / Upload from user machines– Science corresponding to use cases !!
– Design workflows• Experimental operation – March 2006 (hopefully)• Technologies sharing in AP region (East Asia)
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Workflow Description Language
Based on BPEL4WS••

Visit P.107 : Tanaka et al. for details
October 4, 2005

Variable definition
Controls (Loop,Condition)• Parallel execution• Invoke externalservices• Invoke built-in JavaClasses

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JVO collaborators
Project Scientists
NAOJ• Mizumoto• Oe• Shirasaki• Tanaka• Honda• Kawanomoto
ICRR• Yasuda
Ochanomizu U.
• Masunaga
October 4, 2005

System Engineers
Fujitsu Ltd.
• Monzen• Kawarai• Ishihara• Tsutsumi

SEC Ltd.
• Morita• Nakamoto• Kobayashi• Yoshida

SupporterNII•MiuraADASS2005 @ El Escorial, Spain

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Acknowledgement• Core-to-Core Program of theJSPS• Grant-in-Aid by the MEXT
• NAOJ– funding, personnel, etc.

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Reference URLs
JVO – http://jvo.nao.ac.jp/index-e.html
IVOA – http://www.ivoa.net/
there are links to other VO projects in theworld

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Too hard to collect andanalyze whole data.
Need Cat’s help

Data Rate

Accelerate astronomical
research, and sufficient
time for research itself !! Virtual Observatory

October 4, 2005

Nobeyam Radio Obs.

~ 1 TB/yr

SUBARU telescope~ 20 TB/yrALMA~ 1 PB/yr

Even for educational use

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Spain from anywhere
Accessible

at any time21

What is the Virtual Observatory…
and what it is not…
The VO is:• A set of international standards to share complex data
• A modular set of tools to work with distributed data
• A simple environment to publish data to• An essential part of the research astronomer’s toolkit• A catalyst for world-wide access to astronomical archives• A vehicle for education and public outreach

The VO is not:• A replacement for building new telescopes and instruments• A centralized repository for data
• A data quality enforcement organization
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Standardization in IVOA
• Query language to distributed DBs (VOQL)• Meta-data：contents, protocol to interchange
based on OAI-PMH• Protocols to retrieve images, spectra, and so on
SkyNode, SIAP, SSAP, STC, etc.
• Unified attribute names in DBs
UCD (Unified Contents Descriptions)• Output Format：VOTable (XML)incorporates FITS
• etc
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International Endorsements• IAU XXVth GA Res. (2003 Jul.)• OECD Rec. (‘04 Aug)– place archives that may be accessible
via internet– provide adequate funding as long-term
issues

October 4, 2005

ADASS2005 @ El Escorial, Spain24DBs available under JVO• Subaru SupCAM (partial)• SXDS• SMOKA (catalog)• SDSS – images/spectra• 2MASS• JAXA/ISAS – ASCA
– More to come
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Analysis Tools• Sextractor – extract source parameters
generate personal catalogs• HyperZ – derive photometric Z• Aladin – Image viewer• VOPlot – Plot VOTables• SpecView – Spectral Energy Distribution
generator• More to be added– Legacy softwares, Data mining, personal DBs, etc.
October 4, 2005

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