In this paper, we describe Japan’s possible contributions for coronagraph of the Habitable Worlds Observatory (HWO) based on our independent study.
Subaru telescope
Posted inAstronomy & Telescopes, Exploration Gear & Tech, Press Release
The Mass of TOI-1883 b: A Low Density Super-Neptune In The Ridge Regime Transiting An Early-M dwarf
Recent large-scale transit surveys conducted by space telescopes such as Kepler and TESS have revealed a vast number of exoplanets, uncovering the diversity of their population.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Interstellar, Press Release
Subaru Telescope Captures Interstellar Comet 3I/ATLAS Composition Change
The Subaru Telescope observed the interstellar comet 3I/ATLAS on January 7, 2026 (UT), after it made its closest approach to the Sun. By observing colors in the coma around the […]
![[LEFT:] A Rare Brown Dwarf: HIP 71618 B [RIGHT:] A New Giant Planet: HIP 54515 b -- W. M. Keck Observatory and the Subaru Telescope.](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/12/Discoveries-From-Maunakea-Reveal-1.png?resize=1200%2C720&ssl=1)
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Press Release, Stellar Cartography
Discoveries From Maunakea Reveal Hidden Worlds Around Accelerating Stars
Astronomers using W. M. Keck Observatory and the Subaru Telescope on Maunakea, Hawaiʻi Island have discovered a massive planet and a brown dwarf orbiting distant stars—two rare companions that deepen […]
Posted inAI - Data - Apps - Cybernetics, Astronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Press Release
First Results From The Subaru Telescope’s OASIS Survey: Direct Imaging Of New Worlds Around Unexplored Stars
The discovery of two remarkable substellar companions orbiting distant stars has been announced by an international team of astronomers using the Subaru Telescope’s sharp adaptive-optics imaging together with precision stellar […]
Posted inAriel Mission, Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The Mass Of TOI-654 b: A Short-period Sub-Neptune Transiting A Mid-M Dwarf
Sub-Neptunes are small planets between the size of the Earth and Neptune. The orbital and bulk properties of transiting sub-Neptunes can provide clues for their formation and evolution of small […]
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Europa, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Status Report
A Search For Water Vapor Plumes On Europa By spatially Resolved Spectroscopic Observation Using Subaru/IRCS
We present near-infrared high-dispersion spectroscopic observations of Europa using the Infrared Camera and Spectrograph (IRCS) onboard the Subaru Telescope, seeking direct evidence of water plumes on Europa and exploring spatial […]
Posted inAstrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Comets and Asteroids, Icy Worlds, Press Release
Our Outer Solar System Is More Populated With Icy Worlds Than We Thought
Observations of the outer Solar System with the Subaru Telescope have discovered new bodies where none were expected. The new objects are likely members of a much larger population waiting […]
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Status Report
Subaru/CHARIS High-Resolution Mode Spectroscopy of the Brown Dwarf Companion HD 33632 Ab
Brown dwarfs (BD) are model degenerate in age and mass. High-contrast imaging and spectroscopy of BD companions to host stars where the mass and age can be independently constrained by […]
Posted inBiogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Mars, Origin & Evolution of Life, Press Release, Venus, Water/Hycean Worlds & Oceanography
Gliese 12 b: Earth Twin or Evil Twin
The discovery of a planet similar to Venus around a star in the neighborhood of the Solar System raises hopes that astronomers may someday unlock the secret to why life […]