National Astronomical Observatory of Japan

National Astronomical Observatory of Japan

The National Astronomical Observatory of Japan is an astronomical research organisation comprising several facilities in Japan, as well as an observatory in Hawaii and Chile. Derived from Wikipedia licensed CC-BY-SA.

Open Access statistics for National Astronomical Observatory of Japan, Japan, covering academic research published from 2000 to 2024. Read More.


Open Access Percentage

77%


Total
Publications

13K


Total Open
Publications

10K


Total
Citations

521K


Open Access
Percentage

77%


Total
Publications

13K


Total Open
Publications

10K


Total
Citations

521K

Wikipedia

Website

download

Breakdown

20% 48% 8% 24%

Publisher Open

20%

Both

48%

Other Platform Open

8%

Closed

24%

Percentage of Open Access over time

0%10%20%30%40%50%60%70%80%90%100%
2000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024

Publisher Open

Both

Other Platform Open

Closed

Volume of Open Access over time

0100200300400500600700Total Publications
2000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024

Open

Closed

Publisher Open

66%OA Journal

OA Journal 66%

5.9K

Hybrid 6%

569

No Guarantees 28%

2.5K

Other Platform Open

Preprint 87%

6.6K

Institution 34%

2.6K

Other Internet 2%

166

Domain 1%

70

Public 1%

39

Other Platform Locations

Name

Platform Type

Publications

arXiv
Preprint
6.7K
Le Centre pour la Communication Scientifique Directe - HAL - Diderot
Institution
826
DANS - Data Archiving and Networked Services
Institution
691
U.S. Department of Energy Office of Scientific and Technical Information - OSTI OAI
Institution
635
Spanish National Research Council (CSIC - DIGITAL.CSIC)
Institution
230
King's College London - Research Portal
Institution
185
California Institute of Technology - The Caltech Institute Archives
Institution
156
AECID Library - Americanae
Institution
154
University of Groningen / Centre for Information Technology - University of Groningen research database
Institution
140
Massachusetts Institute of Technology - DSpace@MIT
Institution
140
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Data updated 18 August 2025

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