Beta Canum Venaticorum c, target of a slow Generation Ship mission

Image from Steve Bowers

Chara (Beta Canum Venaticorum) - Data Panel

Star: Chara (Beta Canum Venaticorum)
Spectral Type: G0 V
Mass: 2.038E+30 kg (1.025 x Sol)
Radius: 781,271 km (1.123 x Sol)
Absolute magnitude: 4.26
Luminosity: 1.151 x Sol
Temperature: 5,653 Kelvin
Age: 6.2 billion years
Distance from Sol: 27.53 ly (2000 epoch)


(The Three Grace Worlds)
Aglaea (Beta Canum Venaticorum b)
Orbital characteristics:
- Semi-major axis: 45,777,000 km (0.306 AU)
- Period: 61.068 days (0.167 Julian year)
- Eccentricity: 0.175
Physical characteristics:
- Type: Hermean
- Mass: 1.290E+23 kg
- Radius: 1,838 km
- Gravitational acceleration:[/b] 2.549 m/s^2 (0.260 g)
- Rotation period: Tidally-locked
- Albedo: 0.38
- Equilibrium temperature: 462 K

Thalia (Beta Canum Venaticorum c)

Orbital characteristics:
- Semi-major axis: 120,277,000 km (0.804 AU)
- Period: 260 days (0.712 year)
- Eccentricity: 0.102
Physical characteristics:
- Type: Selenian
- Mass: 1.984E+23 kg
- Radius: 2,292.6 km
- Gravitational acceleration: 2.519 m/sec^2 (0.257 g)
- Rotation period: Tidally-locked]
- Albedo: 0.11
- Equilibrium temperature: 312 Kelvin

Euphrosyne (Beta Canum Venaticorum d)

Orbital characteristics:
- Semi-major axis: 190,887,000 km (1.276 AU)
- Period: 520 days (1.424 Julian year)
- Eccentricity:[/b] 0.051
Physical characteristics:
- Type: EuArean > NeoGaian
- Mass: 1.534E+24 kg
- Radius: 4214.8 km
- Gravitational acceleration: 5.763 m/sec^2 (0.587 g)
- Albedo: 0.24
- Equilibrium temperature:[/b] 238 Kelvin
- Rotation period: 79520 s (22.089 hr)
- Obliquity: 12.3°
1) Mirth: Type: Moon Brain, Semi-major axis = 98,400 km, Orbital period = 7.014 days, Eccentricity = 0.1, Inclination = 0.8°, Radius = 400.0 km, Albedo = 0.13

Euphrosyne and Mirth
Image from Steve Bowers
Euphrosyne and its moon, Mirth, which currently has a large number of ultratech processing nodes on the surface
Euphrosyne was detected in the early Interplanetary Age, and after the Technocalypse was the target of a slow-moving Generation Ship, the Endurance, which left Solsys in 710 AT and was due to arrive in 2795 AT. However during this period much faster ships from the First Federation and the Eridanus League had overtaken them, and the system was already colonised. Following a mutiny, the colonists on board the Endurance chose not to decelerate on arrival, and the generation ship continued past Beta Canum Venaticorum and into deep space.

Around half the colonists from the Endurance were transferred to fast-moving Conversion Drive vessels and taken to join the colony on the third planet, which had been named Euphrosyne. This large Arean-type world was in the process of being terraformed.

The arkship Endurance (and the remainder of its population) still continues to travel outwards and is now more than a hundred light years from its original destination.

Euphrosyne became one of the most important worlds in the Yoson Confederacy, with a large Etodist minority, but joined the Solar Dominion after the Version War. This world was briefly renamed Chiri during the ComEmp period, due to the local pronunciation of the star's ancient name, Chara. The name Chiri is still used by some cultures on this world and elsewhere.

Today many of the population live in tall arcologies set among parks and agricultural land. The arcologies are connected by subterranean vac-train circuits.

In the Current Era Aglaea and Thalia are populated by an extremely diverse mechosphere comprised of many kinds of vecs, semisentient robots, smart matter mats, gelbots, and solid, immobile aioids. Aglaea is a densely populated world, and Thalia is treated as a reserve and research site, leasing various craters out to entities wanting to try out their new mechosystem designs.
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Development Notes
Text by Steve Bowers
The Astronomer
Initially published on 08 November 2009.

Additional Information

Fiction related to Euphrosyne

Deceleration Phase