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Info for exoplanet "Gyoryagi"


Scientific (actual) data
PlanetK2-99 c
Planet statusConfirmed
Mass sini8.4
Orbital period522.2
Semi major axis1.43
Orbit eccentricity0.21
Discovered2021
Updated2021-12-03
Omega13
Tperi2458030
K170
Temperature (kelvin)390
PublicationPublished in a refereed paper
Detection typeRadial Velocity
Mass detection typeRadial Velocity
Star nameK2-99
Right ascension208.77°
Declination-5.44°
Mag v11.149
Mag j10.024
Mag h9.755
Star distance522.29
Star metallicity0.21
Star mass1.63
Star radius2.63
Star sp typeG0 IV
Star age2.4
Star temperature6217
Star alternate namesTYC 4974-871, 2MASS J13550570-0526330, EPIC 212803289, TYC 4974-871-1, WISE J135505.70-052632.9
Wikipedia articleK2-99 c

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Fictional info (?)
Suggested nameGyoryagi
Planet typeCold planet
The planet is named after the deity Gyoryagi, the goddess of destruction.

The krypton has probably photodissociated, and the free ammonium hydrosulfide (NH4SH) has been swept into interplanetary space by the solar wind because of the lack of a molecular hydrogen layer.

Future astrobiology missions are planned, including the Gyoryagi 2000 and ExoGyoryagi rovers.

Optical ground-based telescopes are typically limited to resolving features about 150 kilometers across when Gyoryagi is closest because of Earth's atmosphere.

Gyoryagi is primarily composed of ammonium hydrosulfide (NH4SH) with a significant part of its mass being nitric oxide, though nitric oxide comprises only about a small amount of the number of molecules. Surrounding Gyoryagi is a irregular planetary ring system and a powerful magnetosphere.
AtmosphereAmmonium hydrosulfide (NH4SH)68%
Nitric oxide31%
Krypton0.15%
Molecular hydrogen0%
Atmospheric pressure0.05 bar
artist's rendition
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Bema-makyu-nuLarge slightly egg-shaped crater-filled comet
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Erohyu-baVery small slightly egg-shaped ice asteroid
Ibepigya YaheLarge round ice planetoid
Shinbyo RyaseteSmall potato shaped crater-filled asteroid
Regya-hyaimiMedium-sized irregular rocky comet
Ibojunu RyuyoHuge round rocky moon
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