由 AI（Opus 5.5）根据英文卡片翻译。数字、名称和来源均未改动。
有2颗已知行星的恒星
Kepler-396
开普勒-396有2颗已确认的行星。
实测
- 距离
- 约730光年
- 已确认的行星
- 2
与太阳的距离
简介 730光年. 穿越它需要：
- 光730年
- 旅行者1号的速度13百万年
- 以100 km/h的速度行驶7.88亿年
旅行者1号以截至2026-10-25的一年中向外运动的速度（JPL Horizons）。驾车：不停歇，永不加油。
发现方式
- 2013年通过凌星法发现首颗行星（NASA系外行星档案库）。
它的行星
- Kepler-396 c — 5.3 times Earth's width, Neptune-sized; its year lasts 89 days; about 120 °C, hotter than boiling water; found in 2013 by transit.
- Kepler-396 b — 3.5 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 43 days; about 220 °C, hotter than boiling water; found in 2013 by transit.
The NASA Exoplanet Archive's page
资料来源
- 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.