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Stella con 4 pianeti noti

HD 20794

Apri in Ouranos

HD 20794, una stella G6 V, ha 4 pianeti confermati.

Misurato

Distanza: circa 19.6 anni luce
Tipo spettrale della stella: G6 V
Pianeti confermati: 4

Distanza dal Sole

Informazioni 19.6 anni luce. Per attraversarlo:

Luce19.6 anni
Velocità della Voyager 1348,000 anni
In movimento a 100 km/h212 milioni 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 2011 con la velocità radiale (NASA Exoplanet Archive).

I suoi pianeti

HD 20794 f — 2.3 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 650 days; about −58 °C, below freezing; found in 2025 by radial velocity.
HD 20794 e — 2 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 150 days; about 79 °C, between freezing and boiling; found in 2017 by radial velocity.
HD 20794 d — 2 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 90 days; about 120 °C, hotter than boiling water; found in 2011 by radial velocity.
HD 20794 b — 1.5 times Earth's width (estimated from its mass, not measured), about Earth-sized — probably rocky; its year lasts 18 days; about 390 °C, hotter than boiling water; found in 2011 by radial velocity.

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

HD 20794 f — 2.3 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 650 days; about −58 °C, below freezing; found in 2025 by radial velocity.

HD 20794 e — 2 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 150 days; about 79 °C, between freezing and boiling; found in 2017 by radial velocity.

HD 20794 d — 2 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 90 days; about 120 °C, hotter than boiling water; found in 2011 by radial velocity.

HD 20794 b — 1.5 times Earth's width (estimated from its mass, not measured), about Earth-sized — probably rocky; its year lasts 18 days; about 390 °C, hotter than boiling water; found in 2011 by radial velocity.

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.