Tradotto dall'IA (Opus 5.5) dalla scheda inglese. Numeri, nomi e fonti sono invariati.

Stella con 6 pianeti noti

K2-138

Apri in Ouranos

K2-138, una stella G8 V, ha 6 pianeti confermati.

Misurato

Distanza: circa 661 anni luce
Tipo spettrale della stella: G8 V
Pianeti confermati: 6

Distanza dal Sole

Informazioni 661 anni luce. Per attraversarlo:

Luce661 anni
Velocità della Voyager 111.7 milioni di anni
In movimento a 100 km/h7.13 miliardi di anni

Voyager 1 alla velocità con cui si è allontanata nell'anno fino al 2026-10-25 (JPL Horizons). In auto: senza sosta, senza mai fare rifornimento.

Come è stato scoperto

Primo pianeta scoperto nel 2017 con il transito (NASA Exoplanet Archive).

I suoi pianeti

K2-138 c — 2.3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 4 days; about 740 °C, hotter than boiling water; found in 2017 by transit.
K2-138 d — 2.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 5 days; about 620 °C, hotter than boiling water; found in 2017 by transit.
K2-138 b — 1.5 times Earth's width, about Earth-sized — probably rocky; its year lasts 2 days; about 880 °C, hotter than boiling water; found in 2017 by transit.
K2-138 e — 3.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 8 days; about 480 °C, hotter than boiling water; found in 2017 by transit.
K2-138 g — 3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 42 days; about 170 °C, hotter than boiling water; found in 2021 by transit.
K2-138 f — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 380 °C, hotter than boiling water; found in 2017 by transit.

The NASA Exoplanet Archive's page

Da dove proviene

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.

Ogni catalogo utilizzato da Ouranos è citato nella pagina dei crediti.

I suoi pianeti

K2-138 c — 2.3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 4 days; about 740 °C, hotter than boiling water; found in 2017 by transit.

K2-138 d — 2.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 5 days; about 620 °C, hotter than boiling water; found in 2017 by transit.

K2-138 b — 1.5 times Earth's width, about Earth-sized — probably rocky; its year lasts 2 days; about 880 °C, hotter than boiling water; found in 2017 by transit.

K2-138 e — 3.4 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 8 days; about 480 °C, hotter than boiling water; found in 2017 by transit.

K2-138 g — 3 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 42 days; about 170 °C, hotter than boiling water; found in 2021 by transit.

K2-138 f — 2.9 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 380 °C, hotter than boiling water; found in 2017 by transit.

Da dove proviene

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.