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Space Astro
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Info for exoplanet "Riiyu"
| Scientific (actual) data |
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| Planet | HD 4732 A c |
| Planet status | Confirmed |
| Mass sini | 2.37 |
| Orbital period | 2732 |
| Semi major axis | 4.6 |
| Orbit eccentricity | 0.23 |
| Discovered | 2013 |
| Updated | 2019-12-02 |
| Omega | 118 |
| Tperi | 2456090 |
| K | 24.4 |
| Publication | Published in a refereed paper |
| Detection type | Radial Velocity |
| Alternate names | HR 228 c, HD 4732 c, HR 228 A c |
| Star name | HD 4732 A |
| Right ascension | 12.31° |
| Declination | -24.14° |
| Mag v | 5.9 |
| Star distance | 56.5 |
| Star metallicity | 0.01 |
| Star mass | 1.74 |
| Star radius | 5.4 |
| Star sp type | K0 IV |
| Star temperature | 4959 |
| Star alternate names | HD 4732 |
| Wikipedia article | HD 4732 A c |
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| Fictional info (?) |
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| Suggested name | Riiyu |
| Planet type | Cold planet |
| This planet is named after the deity Riiyu, the demon of dreams.
The sulfur dioxide has probably photodissociated, and the free nitric oxide has been swept into interplanetary space by the solar wind because of the lack of a planetary magnetic field.
Plans have been proposed for rovers or more complex missions, but they are hindered by Riiyu's hostile surface conditions.
The Riiyu system has a unique configuration among those of the planets because its axis of rotation is tilted sideways, nearly into the plane of its solar orbit. Observations from Earth have shown seasonal change and increased weather activity as Riiyu approached its equinox 8 years ago. |
| Atmosphere | Nitric oxide | 38% |
| Methane | 23% |
| Sulfur dioxide | 13% |
| Carbon dioxide | 12% |
| Ammonium hydrosulfide (NH4SH) | 9.6% |
| Oxygen | 2.3% |
| Nitrogen | 0.67% |
| Hydrogen chloride | 0.28% |
| Hydrogen peroxide | 0.029% |
| Atmospheric pressure | 40 bar |
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| Moon | Birupa'sewashu | Medium-sized irregular gaseous moon |
| Google search for Riiyu |
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Website by Joachim Michaelis
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