فوياجر 1 بالسرعة التي ابتعد بها خلال السنة حتى 2026-10-25 (JPL Horizons). القيادة: دون توقف، ودون التزود بالوقود أبدًا.
كيف اكتُشف
اكتُشف أول كوكب عام 2018 بطريقتي السرعة الشعاعية والعبور (أرشيف ناسا للكواكب الخارجية).
كواكبه
K2-157 c — 6.1 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 26 days; about 310 °C, hotter than boiling water; found in 2025 by radial velocity.
K2-157 d — 5.2 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 67 days; about 160 °C, hotter than boiling water; found in 2025 by radial velocity.
K2-157 b — 0.9 times Earth's width, about Earth-sized — probably rocky; its year lasts 9 hours; about 2,200 °C, hot enough to melt rock; found in 2018 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.