Press Release

2018

Comet 17P/Holmes which exhibited a Great Outburst in October 2007 was Born in a Region of the Solar Nebula Far from the Sun
Comet 17P/Holmes which exhibited a Great Outburst in October 2007 was Born in a Region of the Solar Nebula Far from the Sun November 7, 2018

A team of astronomers has discovered that Comet 17P/Holmes formed in a cold region of the solar nebula far from the Sun. This suggests that Comet 17P/Holmes probably includes highly volatile species abundantly (with low sublimation temperatures below ~50 K) and that sublimation of these volatiles could be responsible for the comet's explosive releases of dust grains.

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Subaru Telescope Discovers a New Extremely Distant Solar System Object During Hunt for Planet X
Subaru Telescope Discovers a New Extremely Distant Solar System Object During Hunt for Planet X October 3, 2018

Using Hyper Suprime-Cam on the Subaru Telescope, astronomers have discovered a new object at the edge of our Solar System. The new extremely distant object far beyond Pluto has an orbit that supports the presence of an even-farther-out Super-Earth, or larger Planet X.

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Cosmological Constraints from the First-Year Hyper Suprime-Cam

Cosmological Constraints from the First-Year Hyper Suprime-Cam September 26, 2018

The deepest wide field map of the three-dimensional distribution of matter in the Universe ha s been made from the data taken with HSC on the Subaru Telescope. A team of scientists has used the gravitational distortion of images of about 10 million galaxies in the map, and made further constraints on the properties of the "dark energy" that dominates the energy density of the Universe.

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Astronomers Find 12 New Moons, One Oddball, Orbiting Jupiter
Unprecedentedly Wide and Sharp Dark Matter Map July 20, 2018

Scientists announced the discovery of 12 new moons orbiting the planet Jupiter, including one oddball that bucks the trend by orbiting in the opposite direction from others of its kind. The Subaru Telescope's wide-field imaging data allowed the team to follow the motions of the moons and refine the orbits of these satellites.

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Double or Nothing: Astronomers Rethink Quasar Environment
Unprecedentedly Wide and Sharp Dark Matter Map March 12, 2018

Using Hyper Suprime-Cam mounted on the Subaru Telescope, astronomers have identified nearly 200 protoclusters, the progenitors of galaxy clusters, in the early Universe, about 12 billion years ago, about ten times more than previously known. They also found that quasars don't tend to reside in protoclusters; but if there is one quasar in a protocluster, there is likely a second nearby. This result raises doubts about the relation between protoclusters and quasars.

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Unprecedentedly Wide and Sharp Dark Matter Map
Unprecedentedly Wide and Sharp Dark Matter Map March 1, 2018

A research team of researchers released an unprecedentedly wide and sharp dark matter map based on the newly obtained imaging data by Hyper Suprime-Cam on the Subaru Telescope. The dark matter distribution is estimated by the weak gravitational lensing technique. The team located the positions and lensing signals of the dark matter halos and found indications that the number of halos could be inconsistent with what the simplest cosmological model suggests.

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