Traduzido por IA (Opus 5.5) a partir do cartão em inglês. Números, nomes e fontes não foram alterados.

Estrela com 2 planetas conhecidos

K2-18

K2-18, uma estrela M2.5 V, tem 2 planetas confirmados.

Medido

Sobre 124 anos-luz. Para atravessá-lo:

Voyager 1 à velocidade com que se afastou ao longo do ano até 2026-10-25 (JPL Horizons). Dirigindo: sem parar, sem nunca reabastecer.

Primeiro planeta descoberto em 2015 por trânsito e velocidade radial (NASA Exoplanet Archive).

K2-18 b — 2.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 33 days; about 11 °C, between freezing and boiling; found in 2015 by transit.
K2-18 c — 2.7 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 9 days; about 90 °C, between freezing and boiling; found in 2017 by radial velocity.

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.

Traduzido por IA (Opus 5.5) a partir do cartão em inglês. Números, nomes e fontes não foram alterados.

Estrela com 2 planetas conhecidos

K2-18, uma estrela M2.5 V, tem 2 planetas confirmados.

Sobre 124 anos-luz. Para atravessá-lo:

Voyager 1 à velocidade com que se afastou ao longo do ano até 2026-10-25 (JPL Horizons). Dirigindo: sem parar, sem nunca reabastecer.

Primeiro planeta descoberto em 2015 por trânsito e velocidade radial (NASA Exoplanet Archive).

K2-18 b — 2.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 33 days; about 11 °C, between freezing and boiling; found in 2015 by transit.
K2-18 c — 2.7 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 9 days; about 90 °C, between freezing and boiling; found in 2017 by radial velocity.

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.