由 AI（Opus 5.5）根据英文卡片翻译。数字、名称和来源均未改动。
有已知行星的恒星
4 UMa
大熊座4是一颗K1 III型恒星，拥有一颗已确认的行星。
实测
- 距离
- 约240光年
- 恒星光谱型
- K1 III
- 已确认的行星
- 1
与太阳的距离
简介 240光年. 穿越它需要：
- 光240年
- 旅行者1号的速度4.26百万年
- 以100 km/h的速度行驶2.59亿年
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
- 2006年通过视向速度法发现首颗行星（NASA系外行星档案库）。
它的行星
- 4 UMa b — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 270 days; about 690 °C, hotter than boiling water; found in 2006 by radial velocity.
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.