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

Stella con 4 pianeti noti

HR 8799

Apri in Ouranos

HR 8799, una stella A5 V, ha 4 pianeti confermati.

Misurato

Distanza: circa 135 anni luce
Tipo spettrale della stella: A5 V
Pianeti confermati: 4

Distanza dal Sole

Informazioni 135 anni luce. Per attraversarlo:

Luce135 anni
Velocità della Voyager 12.39 milioni di anni
In movimento a 100 km/h1.45 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 2008 con l'imaging diretto (NASA Exoplanet Archive).

I suoi pianeti

HR 8799 d — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 100 Earth years; about 1,000 °C, hot enough to melt rock; found in 2008 by imaging.
HR 8799 b — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 470 Earth years; about 930 °C, hotter than boiling water; found in 2008 by imaging.
HR 8799 e — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 57 Earth years; about 880 °C, hotter than boiling water; found in 2010 by imaging.
HR 8799 c — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 190 Earth years; about 930 °C, hotter than boiling water; found in 2008 by imaging.

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

HR 8799 d — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 100 Earth years; about 1,000 °C, hot enough to melt rock; found in 2008 by imaging.

HR 8799 b — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 470 Earth years; about 930 °C, hotter than boiling water; found in 2008 by imaging.

HR 8799 e — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 57 Earth years; about 880 °C, hotter than boiling water; found in 2010 by imaging.

HR 8799 c — 13 times Earth's width, a giant, Jupiter-sized or more; its year lasts about 190 Earth years; about 930 °C, hotter than boiling water; found in 2008 by imaging.

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.