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
HD 220197
HD 220197是一颗G5型恒星,拥有一颗已确认的行星。
实测
- 距离
- 约210光年
- 恒星光谱型
- G5
- 已确认的行星
- 1
与太阳的距离
简介 210光年. 穿越它需要:
- 光210年
- 旅行者1号的速度3.73百万年
- 以100 km/h的速度行驶2.27亿年
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
- 2018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
- HD 220197 b — 9.3 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts about 5 Earth years; about −110 °C, below freezing; found in 2018 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.