夜空


Based in the Public Relations Center in the National Astronomical Observatory of Japan (NAOJ),the Spectrum Management Office works to protect the environment for astronomy observations through promoting awareness and policies for the effective and responsible management of the electromagnetic spectrum, most notably radio waves and optical light. To this end we work to ensure a peaceful and mutually respectful coexistence between radio astronomers and other radio users and to reduce light pollution as much as possible for the protection of our optically “dark” and radio “quiet” sky.

Radio waves are used in various places in our daily lives. The Spectrum Management Office makes proposals from the perspective of astronomy researchers at public meetings for appropriate spectrum management to avoid radio frequency interference.

We also provide advice and support to Japanese observatories in applying to the Ministry of Internal Affairs and Communications for designation as a radio astronomy facility under Radio Law Article 56-1, which ensures that the operation of recognized radio astronomy facilities will not be obstructed by other services.

The beautiful starry sky belongs to all the people of the world. We know that artificial lighting is required for traffic safety and other modern conveniences, but it is possible to reduce the amount of light that leaks up into the sky. Many satellites in the sky look like stars, but we make efforts to mitigate the impact of those false stars through discussions with the satellite operators.

On this website you can find updates from the Spectrum Management Office as well as an introduction to radio astronomy and the need for spectrum management and light pollution prevention activities.

RFI分布図
   Global RFI distribution taken by the Forte Satellite in 131MHz (Courtesy by A. Tzioumis @ CSIRO, Australia)

Announcements

  • 2022/06:"Coexistence of convenient society and radio astronomy observations" Posted on NAOJ Blog (in Japanese)

    This blog describes how astronomical observations that use radio waves and useful devices that also use radio waves can coexist.
    >> NAOJ blog

  • 2022/03:Introductory Brochure Prepared by Spectrum Management Office (in Japanese)

    This A4 4-page brochure explains what frequency resources are and why frequency resource protection is important for protecting radio astronomy, based on the current severe conditions. You can download the brochure from the following link.

    パンフレット p.1
    パンフレット p.2

    Download >> here.

  • 2021/11: Interview about Spectrum Management Office Posted on You Tube

    An English interview about the Spectrum Management Office conducted by the International Astronomical Union (IAU) Office for Astronomy Outreach (OAO) has been posted on YouTube.


    See YouTube

  • 2021/05: Interview about the activities to protect the starry sky Posted on You Tube

    An English interview with astronomers about the Dark and Quiet Skies project conducted by the International Astronomical Union (IAU) Office for Astronomy Outreach (OAO) has been posted on YouTube.


    See YouTube

  • 2021/03: NAOJ News March 2021 

    "Investigation of the effects of the Darksat satellite on astronomical observations using the Murikabushi Telescope" Posted in “NAOJ News March 2021.” (in Japanese)

  • 2021/02: Newton April 2021

    "40,000 Artificial Satellites Plague Astronomers" Posted in “Newton April 2021". (in Japanese)

    An eight-page special feature details how 40,000 artificial satellites in the sky will affect astronomical observations from the ground, problems in coexistence of space development and space observation, and other issues in the future.

  • 2021/01: Universe Today

    “Astronomers Confirm That Darksat is About Half as Bright as an Unpainted Starlink” Posted in “Universe Today.”

  • 2020/12: Astrophysical Journal Vol.905 No.1.

    "Simultaneous Multicolor Observations of Starlink's Darksat by the Murikabushi Telescope with MITSuME” Posted in the American astrophysical journal "Astrophysical Journal Vol.905 No.1."

  • 2020/05: NAOJ News May 2020

    “Possibility of coexistence: A beautiful starry sky and high-speed Internet communication devices” Posted in “NAOJ News May2020.” (in Japanese)

  • 2020/03:The Astronomical Herald vol.113 No.3

    “Impact of huge communication satellite network on astronomical observation” Posted in “The Astronomical Herald vol.113 No.3.” (in Japanese)

  • News and Updates

  • 2022.07.01:The Ministry of the Environment has posted a YouTube video (in Japanese) to raise awareness for the prevention of light pollution.

    The Ministry of the Environment has posted a video on YouTube, showing measures to prevent light pollution in the Yaeyama Islands, which are located at the most southwestern tip of Japan and have an extremely excellent starry sky. The measures can be applicable to anywhere.
    >> The Yaeyama Islands Coexistence with starry sky (in Japanese)

  • 2021/10/18: Nagano Prefecture has revised the ordinance to prevent light pollution.

    Nagano Prefecture has established measures to prevent light pollution in the " Ordinance on the preservation of a good living environment * " to prevent discomfort to local residents, disruption of the bio-rhythms and growth of animals and plants, and the effects on the starry sky environment. The revised ordinance provides a definition of light pollution, and encourages efforts to prevent light leaking upward from lighting equipment in order to prevent light pollution. The use of searchlights is also prohibited in general, and people using a searchlight may be fined.


  • 2021/09/09: Operation of wireless systems that are expected to affect radio astronomy observation Restricted.

    The details of new restrictions have been posted on the website of the Ministry of Internal Affairs and Communications "Restrictions on operation when using UWB wireless systems outdoors".(in Japanese)

    Please see the"Our Work" page for the contents of discussions and studies.

    停波のお願いポスター

     A poster requesting a reduction of radio wave transmissions.

  • 2020.12.08:Astronomers Confirm a dark coating applied to artificial satellites reduces their reflected light by using the Murikabushi Telescope at Ishigakijima Astronomical Observatory of NAOJ.

  • Staff

  • 2021/06/01:New Member Joins Spectrum Management Office.

    Prof. Masaaki Hiramatsu joined the Spectrum Management Office.

  • Spectrum Management Office Staff

    >>Spectrum Management Office STAFF


  • * : Unofficial Translation