Keldan System

The Keldan System is a planetary system that orbits a star called Keldan, which is an ordinary K-type main sequence/orange dwarf star of spectral classification K0.5V. It is orbited by 8 planets, including one dwarf planet, and many other comets and asteroids. It is situated over 5.49 billion light years away from the Solar System, in a giant lenticular galaxy. The star Keldan gets its name from a primitive sapient species that call themselves the Chalosians, which live on one of the planets in this system.

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## Keldan System

The Keldan System, with all of the orbits of the planets

## System Facts

The Keldan System is interesting because it is probably one of the only planetary systems known that is like the Solar System; this means with an inner and outer system, with a circumstellar disk/asteroid belt separating them. It is also interesting for its 3 planets with life out of the 8, one of which the Chalosians call home. Other than these two cool things, the Keldan system is pretty much just a normal planetary system, forming from a protoplanetary disk that once orbited around the newborn Keldan, just like the Solar System.

## The Star: Keldan

As stated before, Keldan is an ordinary type of star known as a K-type main sequence/orange dwarf star, meaning that it is a star that is slightly cooler than the Sun and is still fusing hydrogen into helium in its core. Keldan, for some reason, probably has a much higher metallicity than the Sun even though it is much older; being about 8.574 billion years old. This also means that the Keldan System itself is about 8.574 billion years old. Keldan is expected to be in the main sequence for about 17 to 20 billion years, meaning at its current age it is about halfway through its main sequence lifetime.

## The System

As again stated before, the Keldan System has two subsystems; the inner system and the outer system, with an asteroid belt separating these two regions. The inner system is dominated by rocky, terrestrial planets, while the outer system however has two giant planets and a terrestrial ice planet.

### Inner System

#### Kelbro

Kelbro, as named by the primitive Chalosians, is the first planet orbiting Keldan and is one of the smallest planets in the Keldan System. Being the closest planet to Keldan, Kelbro gets very hot, and so is the hottest planet in the Keldan System, with temperatures ranging from 380 degrees Celsius to about 430 degrees Celsius. Kelbro is close enough to Keldan that tidal interactions between it and Keldan has allowed it to be very volcanically active, forming an atmosphere of almost entirely sulfur dioxide blanketing Kelbro as a by-product. Kelbro is also so hot that its clouds of probably sulfur dioxide glow a dark red on its nightside. Conditions aside, Kelbro has a mass that is just greater than the mass of Mercury but is substantially larger, probably because of its lower density. Kelbro is in a 6:1 spin-orbital resonance, which surprisingly makes this planet have a day-night cycle. Kelbro has 2 dwarf moons that are not currently known by the Chalosians.

#### Vinualos

    Vinualos, also named by the Chalosians, is the second planet orbiting Keldan and is one of the only terrestrial planets in the Keldan System to have a fully fledged intrinsic magnetosphere, meaning intense aurorae happen on the planet. Being the second closest planet to Keldan, it is also the second hottest planet in the Keldan System, with temperatures ranging from about 222 degrees Celsius to about 235 degrees Celsius. Vinualos does not experience a proper day-night cycle as it is tidally locked to Keldan, likely due to its closeness to Keldan. Vinualos's atmosphere, although thin, is protected by Vinualos's intrinsic magnetosphere, which is, again, one of the only terrestrial planets in the Keldan System to do so. Vinualos has a mass of about 1/3 of the mass of Earth and is just smaller than the Earth. Vinualos has 4 dwarf moons, none of which are currently known by the Chalosians.

#### Paanduyu

    Paanduyu, named by the Chalosians, is the third planet orbiting Keldan and is one of the 3 planets in the Keldan System to have life. Though not as close to Keldan as Vinualos is, it is still close enough to Keldan that it is tidally locked to it. Because it is tidally locked to Keldan, Paanduyu should be an eyeball planet, but it is not. Its thick atmosphere seems to mitigate this effect by distributing heat across Paanduyu's surface, making life on Paanduyu be able to live on the perpetual night side of the planet. Though not as hot as Kelbro and Vinualos, Paanduyu is still hot in its own right, with temperatures ranging from 90 degrees Celsius to 99 degrees Celsius. Because of this high temperature range, most Paanduyan flora are very yellow, covering almost all of the available landmass of Paanduyu, with most Paanduyan fauna being reptiles. Despite the life-bearing conditions, no intelligent life on Paanduyu ever emerged. Paanduyu is one of the 2 ocean worlds in the Keldan System. Paanduyu has a mass of about 70% higher than the Earth's mass while being almost the exact same size as Earth. Despite this high mass, Paanduyu does not seem to have an intrinsic magnetosphere, which makes the planet have an induced magnetosphere instead due to its thick atmosphere. Paanduyu has no known moons.

#### Chalos

    Chalos, home of the Chalosians, is the fourth planet orbiting Keldan and is, again, one of the 3 planets in the Keldan System to have life. Chalos is far enough away from Keldan that Chalos can never get tidally locked to Keldan; instead it rotates freely once every 17 hours and 44 seconds on an axis of about 18 and a half degrees, meaning that Chalos gets seasons that are milder than what is observed on Earth. Chalos is a behemoth of a planet, with a mass of about 8.7 times the mass of the Earth and being 77% larger than Earth. Other than that, Chalos is basically just an Earth-like world with a thicker atmosphere. Chalos's temperature ranges from 12 degrees Celsius to about 20 degrees Celsius. Chalos has 11 known moons, with a major moon called Tribro that orbits Chalos along Chalos's equatorial plane. Chalos is one of 2 ocean worlds in the Keldan System.