» Extrasolar Planet Guide » HD 28185 » HD 28185 b


Water Cloud Jovian

Object Type: Water Cloud Jovian
Parent Star: HD 28185 (G5)
Discovery Status: Confirmed
Habitability: Planet at Earthlike Temperatures at Mean Orbital Distance
Orbit of HD 28185 b Current Planet
Habitability Zone Habitability Zone
Mass ( M sin i ): 5.7 Jupiters
Periastron Distance: 0.95 AU
Mean Distance: 1.03 AU
Apastron Distance: 1.1 AU
Orbital Period: 383 ± 2 Days
Eccentricity: 0.07 ± 0.04
Argument of Perihelion (omega):
351 °
Radial Velocity of Star: 168 m/s
Planet Appearance:
White water ice clouds
Estimated Radius:
1.033 Jupiters 1
Estimated Periastron Temp: 258 Kelvin
Estimated Mean Temp: 249 Kelvin
Estimated Apastron Temp: 240 Kelvin
Temp from
Internal Heating :

209.986 Kelvins 2
Max Angular Star Size: 0.587°
Mean Angular Star Size: 0.542°
Min Angular Star Size: 0.507°
Gravitational Influence
(Hill Sphere):
0.126 AU / 18850000 km
Max Stable Prograde Moon Orbit: 0.045 AU / 6780000 km
Max Moon Mass: > 10 Earths 3
Tidally locked if older than: > 20 Gyr 4
Estimated Bond Albedo: ~ 0.79 5
Notes:
     1 from planet formation models of Burrows et al
     2 from planet formation models of Burrows et al
     3 assuming age of 5 Gyr
     4 orbit may be too eccentric for 1:1 tidal lock
     5 from Sudarsky et al. 2000
Year Discovered: 2001
Detection Method: Doppler Spectroscopy
Discovered By: Michel Mayor, Dominique Naef, Francesco Pepe, Didier Queloz, Nuno C. Santos, Stephane Udry, Michel Burnet

Click image below to enlarge



HD 28185 b is the first exoplanet discovered with a circlular orbit within its star's habitable zone.


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Oceans in the Air
Gigantic oceans of water girdle HD 28185 b. But these oceans are not liquid, they are clouds of ice crystals. Here, we see a cloudscape akin to what might be found on our own world, but on a much vaster scale. In the distance, two of the planet's moons are lit by the morning sun. If one of these moons is large enough and far enough from the planet's super energetic magnetic field, it my harbor oceans of its own. Oceans of a more familiar variety.
Earth-like Moon of HD 28158 b
HD 28185 b orbits within the habitable zone of its star. Although the planet itself is a gas giant with no solid surface, it may have rocky moons, some as large as Earth. Such moons would have similar climate to the Earth as well and might have an atmosphere, oceans, and even, possibly, life.
A Living Moon
Upon an Earth sized rocky moon of HD 28185, safe beneath a nitrogen atmosphere and a strong magnetic field and nurtured by temperate oceans of liquid water, life flourishes. Although mere speculation, the existence of a living moon such as this one is almost guaranteed somewhere in the galaxy.


View the Night Sky from HD 28185 b...

Cylindrical All Sky View
(750 x 1500 pixels)
Northern Hemisphere
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Southern Hemisphere
(750 x 750 pixels)