Kepler-399

ケプラー-399には確認済みの惑星が3個あります。

測定値

概要 2,420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。

Kepler-399 c — 1.4 times Earth's width, about Earth-sized — probably rocky; its year lasts 27 days; about 360 °C, hotter than boiling water; found in 2014 by transit.
Kepler-399 d — 1.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 58 days; about 210 °C, hotter than boiling water; found in 2014 by transit.
Kepler-399 b — 1 times Earth's width, about Earth-sized — probably rocky; its year lasts 14 days; about 500 °C, hotter than boiling water; found in 2014 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。

3個の惑星が知られている恒星

ケプラー-399には確認済みの惑星が3個あります。

概要 2,420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。

Kepler-399 c — 1.4 times Earth's width, about Earth-sized — probably rocky; its year lasts 27 days; about 360 °C, hotter than boiling water; found in 2014 by transit.
Kepler-399 d — 1.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 58 days; about 210 °C, hotter than boiling water; found in 2014 by transit.
Kepler-399 b — 1 times Earth's width, about Earth-sized — probably rocky; its year lasts 14 days; about 500 °C, hotter than boiling water; found in 2014 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.