Kuumavi
Kuumavi
Orbital characteristics
| Semi-major axis | 0.118 AU |
|---|---|
| Eccentricity | 0.12 |
| Orbital period | 10.494 d |
| Inclination | 4.2° to Aurinko's equator |
Physical characteristics
| Radius | 0.414 Earths |
|---|---|
| Mass | 0.072 Earths |
| Mean density | 5.60 g/cm3 |
| Surface gravity | 0.42 g |
| Synodic rotation period | (Tidally locked) |
| Axial tilt | 0.07° |
| Temperature | 588 K |
| Visual magnitude | −2.22 (max) |
Kuumavi is the first planet from Aurinko and the smallest planet in the system. It is a rocky planet with trace amounts of atmosphere. Despite the lack of an atmosphere to protect against asteriod impacts, the planet has much less impact craters than expected due to there being moderate levels of volcanic and tectonic activity which reshapes the surface regularly. This is due to the close proximity of Kuumavi to Aurinko, creating high levels of tidal stress, this has also caused Kuumavi to become tidally locked to Aurinko. This means one side of the planet constantly faces the sun, and the other faces to space, causing huge temperature gradients between the two sides, with the day side reaching above 588 K and the night side reaching around 100K.
Nomenclature
Kummavi is the contraction of the phrase "kuuma kivi", which is Finnish for "hot rock", as Kummavi is (apart from Aurinko) the hottest object in the Aurinko System.
General characteristics
Kuumavi is one of three terrestrial planets in the Aurinko System, and is the smallest of the three.
Kummavi has a solid crust, a slightly rigid outer mantle, a liquid inner mantle and outer core, and a solid core. Kummavi also has an unsually high density of around 5.6 g/cm3 which suggests a large and iron rich core which makes up about 48% of the mass of Kuumavi. Ridges and valleys have been observed on Kuumavi, suggesting that tectonic activity is present, with the most distinctive being the Seinä range, a 3000 km by 300km mountain range with peaks reaching 3 km and higher. The tallest mountain on Kummavi is Mt. Korkea at 5267 m.
Volcanic eruptions have been observed on Kuumavi, with the most recent eruption being in 2423. Most volcanos seem to be concentrated at plate boundaries, though there have been several hotspots identified. Volcanic eruptions have contributed to Kuumavi's exosphere, with high levels of sulphur and carbon oxides detected.
Despite its small size, Kuumavi has a significant magnetic field, likely due to its large liquid core. Strong tidal heating effects due to its close proximity and high eccentricity help keep the core in a liquid state necessary for the formation of the magentic field.