Topics March 19, 2021

Japanese Amateur Astronomer Discovers New Nova in Cassiopeia

A new 9.6-magnitude nova has been discovered.

Science March 19, 2021

American Astronomers Find Secrets of Japanese Universes

Working from a mock catalog of galaxies prepared by a Japanese team, two American teams correctly guessed the cosmological parameters used to generate the catalog to within 1% accuracy. This gives us confidence that their methods will be able to determine the correct parameters of the real Universe when applied to observational data.

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Science February 20, 2021

Sounding Rocket CLASP2 Elucidates Solar Magnetic Field

Cooperative operations between a solar observation satellite and a sounding-rocket telescope have measured the magnetic field strength in the photosphere and chromosphere above an active solar plage region.

Topics February 20, 2021

CLASP2 Team Receives NASA/MSFC Group Achievement Honor Award

The Japan-US-Europe Joint Rocket Experiment (CLASP2) team received the Marshall Space Flight Center (MSFC) Group Achievement Honor Award from the National Aeronautics and Space Administration (NASA).

Science February 16, 2021

Supercomputer Turns Back Cosmic Clock

Astronomers have tested a method for reconstructing the state of the early Universe by applying it to 4000 simulated universes using the ATERUI II supercomputer at NAOJ. They found that together with new observations the method can set better constraints on inflation.

Science January 26, 2021

When galaxies collide—Models suggest galactic collisions can starve massive black holes

It was previously thought that collisions between galaxies would necessarily add to the activity of the massive black holes at their centers. However, researchers have performed the most accurate simulations of a range of collision scenarios and have found that some collisions can reduce the activity of their central black holes.

Topics January 13, 2021

A new-year’s message from the Director General, NAOJ

A new-year’s message from the Director General of NAOJ, Dr. Saku Tsuneta

Science December 18, 2020

Compressive Fluctuations Heat Ions in Space Plasma

New simulations carried out in part on the ATERUI II supercomputer in Japan have found that the reason ions exist at higher temperatures than electrons in space plasma is because they are better able to absorb energy from compressive turbulent fluctuations in the plasma.

Topics December 18, 2020

The Subaru Telescope Photographs the Next Target Asteroid for Hayabusa2

On December 10, 2020 (Hawaiʻi Standard Time), the Subaru Telescope imaged the small asteroid 1998 KY26, the target of Hayabusa2’s extended mission.

Science December 8, 2020

Study Confirms Dark Coating Can Reduce Satellite Reflectivity

Observations conducted by the Murikabushi Telescope of Ishigakijima Astronomical Observatory confirmed that dark coating can reduce satellite reflectivity by half.