HR 8799 e

HR 8799 e
	Artistic rendering of HR 8799 e as a hot gas giant
Discovery
Discovered by	Marois et al.
Discovery site	Keck and Gemini; observatories in Hawaii
Discovery date	November 1, 2010 (announced); November 22, 2010 (published)
Detection method	Direct imaging
Orbital characteristics
Semi-major axis	~ 14.5 ± 0.5 AU; 16.4+2.1; −1.1 AU
Eccentricity	0.15 ± 0.08
Orbital period (sidereal)	~ 50 y
Inclination	25 ± 8°
Star	HR 8799
Physical characteristics
Mean radius	1.17+0.13; −0.11 RJ
Mass	9.6+1.9; −1.8 MJ
Surface gravity	104.3 ± 0.3 cm s−2
Temperature	1,000 K; 1150 ± 50 K
Spectral type	~L7
	^ a b Value given assuming the planet's orbit is circular and is being observed face-on. ;

HR 8799 e is a large exoplanet, orbiting the star HR 8799, which lies 129 light-years from Earth. This gas giant is between 5 and 10 times the mass of Jupiter.^[1] Due to their young age and high temperature all four discovered planets in the HR 8799 system are large, compared to all gas giants in the Solar System.

^ ^a ^b ^c Cite error: The named reference Marois2011 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference Gravity Collaboration was invoked but never defined (see the help page).
^ Cite error: The named reference Brandt2021 was invoked but never defined (see the help page).
^ Cite error: The named reference Skemer2012 was invoked but never defined (see the help page).

[circular_orbit-2] Value given assuming the planet's orbit is circular and is being observed face-on.

[Marois2011-1] Cite error: The named reference Marois2011 was invoked but never defined (see the help page).

[Gravity_Collaboration-3] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference Gravity Collaboration was invoked but never defined (see the help page).

[Brandt2021-4] Cite error: The named reference Brandt2021 was invoked but never defined (see the help page).

[Skemer2012-5] Cite error: The named reference Skemer2012 was invoked but never defined (see the help page).

[1]

[note 1]

[2]

[3]

[4]

Discovery
Artistic rendering of HR 8799 e as a hot gas giant
Discovered by	Marois et al.
Discovery site	Keck and Gemini observatories in Hawaii
Discovery date	November 1, 2010 (announced) November 22, 2010 (published)
Detection method	Direct imaging
Orbital characteristics
Semi-major axis	~ 14.5 ± 0.5^[1]^{[note 1]} AU 16.4+2.1 −1.1^[2] AU
Eccentricity	0.15 ± 0.08^[2]
Orbital period (sidereal)	~ 50^[1]^{[note 1]} y
Inclination	25 ± 8^[2]°
Star	HR 8799
Physical characteristics
Mean radius	1.17+0.13 −0.11 R_J^[2]
Mass	9.6+1.9 −1.8 M_J^[3]
Surface gravity	10^{4.3 ± 0.3}^[2] cm s⁻²
Temperature	1,000 ^[4] K 1150 ± 50^[2] K
Spectral type	~L7^[2]
^ ^a ^b Value given assuming the planet's orbit is circular and is being observed face-on.