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HR 8799 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HR 8799 b

Confirmed exoplanet · Gas Giant

HR 8799 b

Orbiting HR 8799

Discovered in 2008 using Imaging. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

HR 8799 System (NIRCam image), an official ESA/Webb exoplanet image or artist concept — Sourced object or system artworkNASA, ESA, CSA, STScI, W. Balmer (JHU), L. Pueyo (STScI), M. Perrin (STScI)

Discovery: 2,008
Method: Imaging
Radius: 13 R⊕
Mass: 2,000 M⊕
Orbit: 170,000 days
Distance: 41.2441 pc

Planet profile

Orbit and physical properties

Orbital period: 170,000 days
Semi-major axis: 68 AU
Eccentricity: Not reported by the NASA Exoplanet Archive
Radius: 13 Earth radii
Mass: 2,000 Earth masses
Mass provenance: Mass
Density: 5 g/cm³
Equilibrium temperature: 1,200 K
Insolation: 0.0011 Earth flux

Host system

Star and system properties

Host star: HR 8799
Stars in system: 1
Known planets in system: 4
Spectral type: A5 V
Stellar temperature: 7,204.58 K
Stellar radius: 1.49338 R☉
Stellar mass: 1.5 M☉
Stellar metallicity: -0.47 dex
Stellar age: 0.06 Gyr
Distance: 41.2441 parsecs
Right ascension: 23h07m28.84s
Declination: +21d08m02.54s

Discovery

Detection and provenance

Discovery method: Imaging
Discovery year: 2,008
Publication date: 2008-11
Discovery locale: Ground
Facility: Gemini Observatory
Telescope: 8.19 m Gemini North Telescope
Instrument: NIRI Camera
NASA Exoplanet Archive: Open composite record ↗

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