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 2011 بطريقتي السرعة الشعاعية والعبور (أرشيف ناسا للكواكب الخارجية).
كواكبه
Kepler-20 g — 4.7 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 35 days; about 250 °C, hotter than boiling water; found in 2016 by radial velocity.
Kepler-20 c — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 11 days; about 560 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 d — 2.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 78 days; about 160 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 f — 1 times Earth's width, about Earth-sized — probably rocky; its year lasts 20 days; about 410 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 b — 1.8 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 4 days; about 910 °C, hotter than boiling water; found in 2011 by transit.
Kepler-20 e — 0.8 times Earth's width, about Earth-sized — probably rocky; its year lasts 6 days; about 730 °C, hotter than boiling water; found in 2011 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.