by Max Barry

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33

Zeganas's solar system.

This is the solar system that Zeganas is located in, with 7 planets and a brown dwarf. 3 of the planets are proven to be habitable with breathable atmospheres.

1 nakolna ZAU = 0.91 earth AU
1 nakolna mass = 1.15 earth masses
1 nakolna radius = 1.08 earth radii
1 nakolna density = 0.913 earth density
1 nakolna zG (gravity) = 0.985 earth G
1 nakolna year = 0.877 earth years
1 nakolna year = 320.57997685(185 repeating forever) days

Star: Hunasai

Stats

Mass

1.9510^23 kg (0.978x sun)

Radius

674,676 km

Luminosity

3.37E10^23 watts (0.875x sun)

Temperature

5,698 K (0.99x sun)

Metallicity

2.1%

Age

5.5 billion years

Description

The parent star is a G4V main sequence star currently halfway through its lifespan. It's a star with a substellar companion, Lonaiso.

Planet 1: Hedera

Stats

Orbit

8,955,024 km (0.066 ZAU, 0.060 AU)

Period

5.41 days

Radius

2,733 km (0.4x nakolna, 0.43x earth)

Mass

3.6110^23 kg (0.053x nakolna, 0.06x earth)

Area

93,861,854 km

Density

4.22 g/cm (0.84x nakolna, 0.77x earth)

Gravitational Acceleration

3.22 m/s (0.33x nakolna, 0.33x earth)

Average Temperature

1244 C (day) 121 C (night)

Atmosphere

trace amounts of hydrogen, helium, and oxygen

Description

A very hot and somewhat molten world, Hedera sits super close to the sun and is tidally locked to it, with the day side bearing extremely hot temperatures and the night side relatively cool but still seismically active and volcanic.

Planet 2: Daolinu

Stats

Orbit

43,756,891 km (0.32 ZAU, 0.29 AU)

Period

58.4 days

Radius

5,312 km (0.77x nakolna, 0.83x earth)

Mass

3.0610^24 kg (0.45x nakolna, 0.51x earth)

Area

354,589,602 km

Density

4.87 g/cm (0.97x nakolna, 0.88x earth)

Gravitational Acceleration

7.24 m/s (0.75x nakolna, 0.74x earth)

Average Temperature

949 C

Atmosphere

92 atmospheres (pressure), 95.8% carbon dioxide, 4.2% nitrogen

Description

This planet has the hottest average surface temperature of any planet, despite being further from the sun than Hedera, its atmosphere is extremely dense and traps a lot of solar heat due to the large amounts of carbon dioxide. The surface has many lava flows.

Planet 3: Dasnar

Stats

Orbit

105,316,375 km (0.77x ZAU, 0.70 AU)

Period

218 days

Radius

6,265 km (0.91x nakolna, 0.98x earth)

Mass

5.2310^24 kg (0.76x nakolna, 0.88x earth)

Area

493,232,874 km

Density

5.08 g/cm (1.01x nakolna, 0.92x earth)

Gravitational Acceleration

8.90 m/s (0.92x nakolna, 0.91x earth)

Average Temperature

56 C

Atmosphere

770 torr, 75.18% nitrogen, 22.83% oxygen, 1% water vapor, 0.95% argon, 0.02% carbon dioxide, 0.02% other

Description

A really hot desert world, prone to global dust storms and heat waves, there is bountiful vegetation near the southern polar region with a south pole ocean providing ample amounts of water, it can get very rainy and polar hurricanes can develop frequently. Currently there are 4 populated settlements on the planet.

Planet 4: Nakolna

Stats

Orbit

136,137,065 km (0.91 AU)

Period

320.6 days

Radius

6,875 km (1.08x earth)

Mass

6.84710^24 kg (1.15x earth)

Area

593,957,361 km

Density

5.03 g/cm (0.91x earth)

Gravitational Acceleration

9.661 m/s (0.985x earth)

Average Temperature

23 C

Atmosphere

778 torr, 72.47% nitrogen, 24.0% oxygen, 2.5% water vapor, 0.97% argon, 0.05% carbon dioxide, 0.01% other

Description

The native planet of Zeganas. It's a warm planet with temperate zones at high lattitudes, but much of it has tropical characteristics, there is not much ice as the south pole is an ocean and the north pole is an archipelago, resulting in a lower albedo, more carbon dioxide, and a higher temperature.

Nakolna Alpha Moon

Stats

Orbit

138,202 km

Period

5.54 days

Radius

812 km

Mass

6.7510^21 kg

Area

8,285,561 km

Density

3.01 g/cm

Gravitational Acceleration

0.683 m/s

Description

This moon is just big enough to cover the sun during an eclipse, and when an eclipse happens, there's a larger umbra cast on nakolna.

Nakolna Beta Moon

Stats

Orbit

399,195 km

Period

27.125 days

Radius

2,232 km

Mass

1.8210^23 kg

Area

62,603,447 km

Density

3.91 g/cm

Gravitational Acceleration

2.44 m/s

Description

The outer and more massive moon which is also just big enough to cause total solar eclipses, there is a rare phenomenon where both moons can cause an eclipse.

Planet 5: Masae

Stats

Orbit

170,542,770 km (1.25 ZAU, 1.14 AU)

Period

522.25 days

Radius

4,932 km (0.72x nakolna, 0.77x earth)

Mass

3.0310^24 kg (0.44x nakolna, 0.51x earth)

Area

305,424,381 km

Density

6.03 g/cm (1.2x nakolna, 1.09x earth)

Gravitational Acceleration

8.32 m/s (0.86x nakolna, 0.85x earth)

Average Temperature

-19 C

Atmosphere

689 torr, 73.84% nitrogen, 22.67% oxygen, 2.4% water vapor, 0.96% argon, 0.09% carbon dioxide, 0.04% other

Description

Third habitable world, and very cold. Moderate temperatures can be found mainly along the equatorial regions and tundras are widespread. Without the ample carbon dioxide and current geological activity, it would likely be completely frozen.

Planet 6: Pakanisa

Stats

Orbit

635,763,678 km

Period

3,235 days

Radius

51,645 km

Mass

5.2410^26 kg

Density

908 kg/m

Gravitational Acceleration

13.1 m/s

Average Temperature

-164 C

Description

The largest planet (excluding the brown dwarf Lonaiso), Pakanisa is a gas giant mostly made of hydrogen and helium, with bands of various clouds.
It's helped shape the solar system be what it is today.

Pakanisa Moon 1: Dunaraev

Stats

Orbit

402,137 km

Period

75.1 hours

Radius

5,455 km

Mass

2.1410^24 kg

Area

373,937,805 km

Density

3.15 g/cm

Gravitational Acceleration

4.80 m/s

Description

The largest moon in the system, Dunaraev is an icy, geologically active world that gets a lot of tidal heating from Pakanisa, so it's speculated that there's a massive liquid ocean underneath the icy surface, it's bigger than 3 planets in the system.

Pakanisa Moon 2: Dorona

Stats

Orbit

834,549 km

Period

225 hours

Radius

2,866 km

Mass

1.8810^23 kg

Area

103,219,615 km

Density

1.91 g/cm

Gravitational Acceleration

1.53 m/s

Description

Another icy moon of Pakanisa, Dorona is thought to also have an ocean underneath its surface due to the tidal actions of Pakanisa, Dunaraev,
and Eruntaji all acting on it.

Pakanisa Moon 3: Eruntaji

Stats

Orbit

1,325,836 km

Period

451 hours

Radius

1,854 km

Mass

6.310^22 kg

Area

43,194,587 km

Density

2.36 g/cm

Gravitational Acceleration

1.22 m/s

Description

An icy moon that may also be rocky, Eruntaji is the smallest of the 3 big moons of Pakanisa.

Planet 7: Asakona

Stats

Orbit

1,007,461,463 km

Period

6,454 days

Radius

25,301 km

Mass

1.0710^26 kg

Density

1.57 g/cm

Gravitational Acceleration

11.1 m/s

Average Temperature

-168 C

Description

An ice giant planet, meaning that it has mostly elements heavier than hydrogen and helium, with much of the materials in it being ammonia, methane, and water.

Asakona Moon: Nayamoro

Stats

Orbit

688,174 km

Period

373 hours

Radius

2,566 km

Mass

1.9710^23 kg

Area

82,741,458 km

Density

2.78 g/cm

Gravitational Acceleration

1.99 m/s

Description

The largest moon of Asakona by far, an icy moon that may have a liquid ocean under the surface.

Brown Dwarf: Lonaiso

Stats

Orbit

19,178,447,024 km

Period

1658 nakolna years

Radius

251,133 km

Mass

3.310^28 kg

Density

498 kg/m

Gravitational Acceleration

35.0 m/s

Luminosity

1.2110^19 watts

Temperature

2,154 K

Metallicity

3.4%

Description

The brown dwarf, Lonaiso is thought to have some satellites around it, 3 large ones have been observed so far.

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