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Cyran
Cyranthumb
Cyran as seen from orbit.
Planet of Kerbol
Orbital Characteristics
Semi-major axis 37 500 000 000 m [Note 1]
Apoapsis 45 000 000 000 m [Note 1]
Periapsis 30 000 000 000 m [Note 1]
Orbital eccentricity 0.2
Orbital inclination 7 °
Argument of periapsis 120 °
Longitude of the ascending node 8 °
Mean anomaly 80 rad (at 0s UT)
Sidereal orbital period 42 140 658 s
1 950 d 5 h 44 m 18 s
Synodic orbital period 11775270.7 s
Orbital Velocity 4 565 to 6 848 m/s
Physical Characteristics
Equatorial radius 8 000 000 m
Equatorial Circumference 50 265 482 m
Surface area 8.0424772×1014 m2
Mass 1.5986676×1025 kg
Standard gravitational parameter 1.0669635×1015 m3/s2
Density 7 454.1751 kg/m3
Surface gravity 16.7 m/s2 (1.7 g)
Escape velocity 16 332.20 m/s
Sidereal rotation period 36 000.000 s
1 d 4 h 0 m 0 s
Solar day 36 030.780 s
1 d 4 h 0 m 30.8 s
Sidereal rotational velocity 1 396.3 m/s
Synchronous orbit 24 718.87 km
Sphere of influence 2.2786138×109 m [Note 1]
Atmospheric Characteristics
Atmosphere present ✓ Yes
Atmospheric Pressure 2 026.50 kPa
20 atm
Scale height  m
Atmospheric height 500 000 m
2.0×10-5 atm
Temperaturemin Unknown
Temperaturemax Unknown
Oxygen present × No
Scientific multiplier
Surface N/A
Splashed N/A
Lower atmosphere 1
Upper atmosphere 20
Near space 7
Outer space 6
Recovery 5

  1. 1.0 1.1 1.2 1.3 The distances are given from the bodies center not surface (unlike ingame)

Cyran is a Super-Jool gas giant added in the Kopernicus pack Planet Cyran.

It is a hot, orange planet generating its own heat and has a fiery ring system. Cyran replaces Dres' location between Duna and Jool, and has 9 moons. One of these moons is a relocated and re-textured Dres. Two of Cyran's moons have oceans, while one is potentially habitable.

In-Game Description

A huge and somewhat angry looking gas giant, Cyran is as much loved as it is feared. The decay of radioactive elements in the planet's core have heated up the planet, and thus it seems to glow. It is also quite warm close to this planet due to the heat generated by the radioactive decay, so be careful with aerobraking, you might just melt from the sheer temperature of the atmosphere.

Kerbin Astronomical Society

Characteristics

Physical Properties

Cyran is a "Super-Jool". These are large gas giants with a greater radius and mass than Jool in the stock KSP system. It has a radius of 8,000 kilometers, or 1.3 Jool Radii. Cyran also has more than twice the gravity of Jool and 2-4 times its mass. This results in the planet having a radioactive core and huge amounts of released heat, getting it close to the level of a Y-Class Brown Dwarf (though this would require the presence of fusion).

Atmosphere

Cyran's atmosphere starts at 500 kilometers, with 20 times the pressure of Kerbin's atmosphere. The radioactive decay of the planet's large core heats the atmosphere - this is handled in a unique way with Cyran, as instead of it having a mundane hot atmosphere the technical temperature of its atmosphere remains zero throughout but all craft will heat up every physics tick, with the rate of heating increasing as altitude drops. This inexorable heating, high speed and the very sudden onset of the atmosphere make entering Cyran's atmosphere extremely hazardous and the high drag means craft will often be destroyed by the heating before they penetrate into the lower atmosphere.

The atmosphere of Cyran has several distinct cloud features. It has a few prominent jet streams running alongside glowing cloud belts that contain air from near the planet's core. There is one huge superstorm in Cyran's atmosphere, along with multiple smaller ones. There are an equal concentration of these mini-storms in both the Northern and Southern hemispheres of Cyran.

Altitude (m) Pressure (Pa) Pressure (atm)
0 2 026 500 20.000
10 000 1 775 590 17.524
20 000 1 047 109 10.334
30 000 1 532 880 15 128
40 000 1 204 155 11.884
50 000 Unknown Unknown
60 000 Unknown Unknown
70 000 Unknown Unknown
80 000 838 435 8.275
90 000 764 160 7.542
100 000 694 580 6.855
120 000 569 692 5.622
140 000 462 535 4.565
160 000 371 637 3.668
180 000 295 274 2.914
200 000 231 866 2.288
225 000 168 109 1.659
250 000 118 613 1.171
275 000 80 125 0.791
300 000 49 393 0.487
325 000 26 493 0.261
350 000 16 999 0.168
400 000 9 629 0.095
450 000 2 959 0.029
500 000 0 0.000

Biomes

Cyran is unique for being one of the very few gas giants in a Kopernicus planet pack to have biomes. There are 5 in total and mark prominent features in Cyran's turbulent atmosphere.

Cyran Biome Map

Cyran biome map

  • Lower Storms (Black)
  • Upper Storms (Blue)
  • Jet Streams (Green)
  • Glowing Bands (Red)
  • Superstorm (White)

System

Rings

Cyran has a narrow band of brightly glowing rings. These are made from material shed by the half-molten moon Infernas. The rings of Cyran are heated to well over 800 Kelvin.

Moons

Cyran has 9 moons, in alphabetical order:

  • Crysalis: A small asteroid-like body in an extremely eccentric orbit with an exposed metallic core.
  • Dres: This is a remade version of Dres. It is a crimson-grey moon with steep ridges and lots of craters.
  • Glacia: A distant, icy moon with grey uplands and blue-ice craters.
  • Iltan: A Kerbin-like moon with golden land masses, a breathable atmosphere, and oceans of water.
  • Infernas: A rocky moon with a decaying orbit that is being torn apart by Cyran. One side is pure lava, while the other is mostly made of basalt.
  • Kivlan: A beautiful cyan ice moon with a decently thick atmosphere and vast mountain ranges.
  • Protorin: A moon covered covered in extensive purple canyon systems.
  • Sennim: A large, blue-green moon similar to Titan with a thick atmosphere and lakes of liquid mercury.
  • Zerto: A small purple and grey planetoid captured in a retrograde orbit around Cyran.

Trivia

  • Despite not being based off of any known exoplanet, Cyran bears similarities to the planet J1407b.
  • Planet Cyran is the only planet pack that moves and remakes Dres while keeping the rest of the Kerbol system the way it normally is.
  • If you reach the bottom of the atmosphere, a consequence of how Cyran handles temperatures means there is an ocean of lava you can splash down in at 0 altitude. This is impossible without cheats.
  • Planet Cyran is one of the few planet packs to feature a gas giant with a custom normal map.

Reference Frames

Warp Minimum Altitude
Any
5× 500 000 m (above the atmosphere)
10× 500 000 m (above the atmosphere)
50× 500 000 m (above the atmosphere)
100× 500 000 m (above the atmosphere)
1 000× 1 000 000 m
10 000× 7 500 000 m
100 000× 40 000 000 m