Highly tilted world with a unique geneered biosphere
Image from Steve Bowers
|April during an equatorial season, when nearly the entirety of the surface enjoys moderate illumination. Soon, however, one hemisphere will plunge into the long night of the winter and the other will be showered by constant sunlight, creating extreme climates that sweep across nearly the entire globe. To prevent the planet from freezing over, April's atmosphere is slightly thicker and contains high levels of carbon dioxide.|
This planet is surrounded by a ring of macrostats, long orbiting habitats which are large enough to produce a small amount of tidally-induced gravity effects at each end. Most of the population lives in these habitats.
Beta Hydri - Data Panel
|Star||Names: Beta Hydri, Calendar|
|Physical characteristics||- Mass: 2.148E+30 kg (1.08 x Sol)|
- Radius: 1,258,521 km (1.809 x Sol)
- Luminosity: 3.505 x Sol (bolometric)
- Temperature: 5,872 Kelvin
- Spectral type: G2IV - a G-type subgiant star whose brightness has, as of 10600 AT, increased to over three times its main sequence luminosity.
- Age: 6.40 billion years
- Distance from Sol: 25.297 ly (10600 AT)
- Galactic xyz 10.61,-15.34,-15.69
The Planets of Beta Hydri - Data Panel
|Planets||Surviving records found at the Aristotle (Delta Pavonis) system suggested that the names of the planets in this system were chosen by a public vote organized by Earth's astronomical organization in 376 as an homage to the old Gregorian calendar, which was being replaced by the Tranquility calendar across much of the Solsys. Undecember was named later, during the First Federation era, by the colonists.|
- 2 Jovians: September and October.
- 3 Neptunians: August, November, and December.
- 4 Superterrestrials: January, February, March, June.
- 3 Terrestrials: April, May, and July.
- 15 dwarf planets, including Undecember
April - Data Panel
|Orbital characteristics||- Semi-major axis: 287,378,000 km (1.921 AU)|
- Period: 935.8 days (2.562 Julian years)
- Eccentricity: 0.043
|Physical characteristics||- Type: Skolian (a highly tilted terrestrial world, transformed by ecopoesis to support a specialised biosphere|
- Mass: 1.445E+24 kg
- Radius: 4,201.7 km
- Density: 4,651 kg/m^3
- Gravity: 5.463 m/s^2 (0.557 g)
- Rotation period: 121,406 s (33.72 hr)
- Obliquity: 62.9°
- Albedo: 0.331 (highly variable)
- Average surface temperature: 296 K (highly variable)
|Atmosphere||- Surface pressure: 122 kPa|
- Composition: 80% N2, 20% O2, 0.1% CO2, traces of other gases.
Image from Anders Sandberg
|Macrostats above Mt Hara on April, Beta Hydri II|
Image from Steve Bowers
|Macrostats above April. The centre of gravity of each habitat is in orbit at 2000 km above the surface, and the structure is extended two hundred kilometres in both directions (inward and outward). At the extremities of each habitat, tidal effects produce a low level of acceleration, approximately 0.02 gees in each case. This is similar to the gravity levels on a small moon or planetoid.|