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

Stella con 3 pianeti noti

GJ 581

GJ 581, una stella M3.0 V, ha 3 pianeti confermati.

Misurato

Informazioni 20.5 anni luce. Per attraversarlo:

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.

Primo pianeta scoperto nel 2005 con la velocità radiale (NASA Exoplanet Archive).

GJ 581 b — 4.8 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 5 days; about 190 °C, hotter than boiling water; found in 2005 by radial velocity.
GJ 581 c — 2.5 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 73 °C, between freezing and boiling; found in 2007 by radial velocity.
GJ 581 e — 1.4 times Earth's width (estimated from its mass, not measured), about Earth-sized — probably rocky; its year lasts 3 days; about 280 °C, hotter than boiling water; found in 2009 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.

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

Stella con 3 pianeti noti

GJ 581, una stella M3.0 V, ha 3 pianeti confermati.

Informazioni 20.5 anni luce. Per attraversarlo:

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.

Primo pianeta scoperto nel 2005 con la velocità radiale (NASA Exoplanet Archive).

GJ 581 b — 4.8 times Earth's width (estimated from its mass, not measured), Neptune-sized; its year lasts 5 days; about 190 °C, hotter than boiling water; found in 2005 by radial velocity.
GJ 581 c — 2.5 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 13 days; about 73 °C, between freezing and boiling; found in 2007 by radial velocity.
GJ 581 e — 1.4 times Earth's width (estimated from its mass, not measured), about Earth-sized — probably rocky; its year lasts 3 days; about 280 °C, hotter than boiling water; found in 2009 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.