K2-9

M2.5 V型星のK2-9には、確認された惑星が1個あります。

測定値

概要 271光年. 横断するには:

2026-10-25までの1年間に外向きに進んだ速さでのボイジャー1号（JPL Horizons）。走行条件：休みなし、給油なし。

K2-9 b — 2.3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 18 days; about 41 °C, between freezing and boiling; found in 2015 by transit.

NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.

英語版カードからAI（Opus 5.5）により翻訳。数値、名称、出典は変更していません。

惑星が知られている恒星

M2.5 V型星のK2-9には、確認された惑星が1個あります。

概要 271光年. 横断するには:

2026-10-25までの1年間に外向きに進んだ速さでのボイジャー1号（JPL Horizons）。走行条件：休みなし、給油なし。

K2-9 b — 2.3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 18 days; about 41 °C, between freezing and boiling; found in 2015 by transit.

NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.