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Info for exoplanet "Demedeia"


Scientific (actual) data
PlanetKepler-991 b
Planet statusConfirmed
Radius0.227
Orbital period82.5342
Discovered2016
Updated2021-02-05
Tconj2455040
PublicationAnnounced on a website
Detection typePrimary Transit
Alternate names2MASS J19482175+4937356 b, K01876.01, KIC 11622600 b, KOI-1876 b, KOI-1876.01, WISE J194821.73+493735.4 b
Star nameKepler-991
Right ascension297.09°
Declination49.63°
Mag j13.329
Mag h12.72
Mag k12.611
Star distance370
Star metallicity-0.25
Star mass0.64
Star radius0.61
Star age3.47
Star temperature4392
Star alternate names2MASS J19482175+4937356, KIC 11622600, KOI-1876, WISE J194821.73+493735.4
Wikipedia articleKepler-991 b

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Fictional info (?)
Suggested nameDemedeia
Planet typeCold planet
This planet is named after the deity Demedeia, the god of fear.

An observer on Demedeia would therefore see only one sunrise every three years.

Two spacecraft have visited Demedeia: Wayfinder 6 flew by 27 years ago; and Messenger, launched 23 years ago, orbited Demedeia over 105 times in four years before exhausting its reactor and crashing into the planet's atmosphere 4 years later.

Demedeia is by far the hottest planet in its solar system, with a mean surface temperature of 587°K (314°C).

The two polar ice caps appear to be made largely of dust.

Demedeia can easily be seen from Aithi-mip with the naked eye, as can its greenish coloring. Its apparent magnitude reaches -3, which is surpassed only by Aithi-mip, Nogreip, and Kepler-991.

Surrounding Demedeia is a vast planetary ring system and a powerful magnetosphere.
AtmosphereAmmonium hydrosulfide (NH4SH)63%
Formaldehyde27%
Carbon dioxide6.2%
2H2O2.2%
Neon0.35%
Oxygen0.22%
Molecular hydrogen0.058%
Atmospheric pressure100 bar
artist's rendition
MoonLiaqMedium-sized slightly egg-shaped gaseous asteroid
Masnoe-siLarge round ice moon
Ditage LisviVery small potato shaped rocky asteroid
SaomoneVery small round crater-filled moon
Google search for Demedeia


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