The Vera C. Rubin Observatory released its first images taken with the world’s largest digital camera on June 23, 2025 (local ...

Detail ： GJ 504 b is an exoplanet orbiting a sun-like star GJ 504. It is estimated to be three to six times more massive than Jupiter, making it the least massive planet ever directly imaged. This ...

ベラ・C・ルービン天文台は、世界最大のデジタルカメラによる観測画像を 2025年6月23日（現地時）に初公開しました。今後、このカメラを用いた大規模撮像探査プロジェクト「LSST（Legacy Survey of Space and Time）」が本格的に始まります。LSST には、国立天文台の研究者を含む日本の研究者も多く ...

An international team of astronomers has discovered a tightly packed cluster of supermassive black holes dating back 10.8 billion years―the most extreme concentration of such objects ever found in the ...

If a person with both Japan and Time Exchange attributes, such as a Japanese national affiliated with a U.S. research institution, proposes to use the Subaru Telescope, he or she may choose which ...

国立天文台や東京大学の研究者を含む国際共同研究チームは、くじら座の方向の約 108 億年前の宇宙で 11 個の超巨大ブラックホールが一斉に輝く構造を発見しました。これほど密集した超巨大ブラックホールの集団が見つかったのは、初めてのことです。

説明 ： 太陽に似た恒星「GJ 504」を周回する惑星「GJ 504 b」は、その質量が木星の3～6倍程度と見積もられ、直接撮像された惑星としては最小の質量を記録しました。この「第二の木星」とも例えられる暗く低温の惑星は ...

Detail ： Low Res. ( 85 KB) / Mid. Res. ( 1.46 MB) / High Res. ( 9.3 MB) When we look up at the night sky, we see stars that appear to twinkle. This twinkling occurs because the light from the stars is ...

The Call for Proposals for Semester S25B received 139 submitted proposals for the Normal and Intensive Programs requesting a total of 319.96 nights. After screening by TAC, 99.05 (including 6.5 ToO) ...

See “CCD information” for the detail. The CCDs are arranged on the focal plane with two different gaps of approximately 12 arcsec and 53 arcsec between neighboring CCDs. We recommend that you should ...

Figure 2: The laboratory measurement of the throughput of the LS-J and LS-H grisms (images by courtecy of Dr. Ebizuka). Also shown in each figure is of the current VPH-J (left) and VPH-H (right).