Ornak

Ornak, also known as Craehlil IV, is the fourth planet of the Craehlil System within the Orion Arm of the Milkyway Galaxy, orbiting Craehlil at approximately 2.18 AU. Classified as a dwarf gas giant, Ornak possesses a tenuous ring system, a degraded magnetosphere, and a dense, layered atmosphere dominated by hydrogen, ammonia, and silicate aerosols. While lacking the massive scale of true gas giants, Ornak remains geologically and chemically dynamic due to internal heating from tidal stresses and radioactive decay in its core. Its atmosphere churns with turbulent bands, thermal updrafts, and intermittent storm systems that flicker with violet electrical discharges. Below its visible cloud decks lies a semi-metallic hydrogen layer where pressures crush and distort even advanced probes.

Ornak

Astrographical Information

Galaxy

Milkyway

Galactic Arm

Orion

System

Craehlil System

Orbiting

Craehlil

Orbital position

Fourth Planet

Orbital Distance

2.18 AU (326,135,360 km)

Orbital characteristics

Aphelion

2.25 AU (336,094,207 km)

Perihelion

2.11 AU (316,176,513 km)

Semi-major axis

2.18 AU (326,135,360 km)

Eccentricity

0.057

Orbital period (sidereal)

931.4 days

Average orbital speed

19.1 km/s

Mean anomaly

140.6°

Inclination

• 1.9° – Craehlil's equator;

• 1.3° – invariable plane;

• 2.5° – J2000 ecliptic

Longitude of ascending node

82.7°

Time of perihelion

104.3 days

Argument of perihelion

96.5°

Moon(s)

163

Physical Information

Diameter

62,270 km (38,701.6 mi)

Mean radius

31,135 km (19,350.8 mi)

Equatorial radius

32,012 km (19,887.9 mi)

Polar radius

29,983 km (18,813.7 mi)

Flattening

0.0634

Circumference

• 201,187 km; equatorial

• 188,310 km; meridional

Surface area

12.18 × 10⁹ km²

Volume

1.26 × 10¹⁵ km³

Mass

2.18 × 10²⁶ kg

Mean density

1.92 g/cm³

Surface Gravity

19.5 m/s²

Moment of inertia factor

0.245

Escape velocity

33.4 km/s

Synodic rotation period

18.6 hours

Sidereal rotation period

17.8 hours

Equatorial rotation velocity

3,136.4 m/s

Axial tilt

11.2°

Axial Precession

10,900 years (modest magnetic-induced wobble)

Albedo

• 0.34 geometric

• 0.22 Bond

Temperature 71–448 K

Surface Temperature

• -170°C (–274°F) Min

• –108°C (–162°F) Mean

• –42°C (–44°F) Max

Surface absorbed dose rate

46.8 μGy/h

Surface equivalent dose rate

55.3 μSv/h

Apparent magnitude

–2.0" to 3.8"

Absolute magnitude (H)

4.17

Atmosphere

Atmospheric pressure

1,800,000 kPa in lower layers

Composition by volume

• 73.2% Hydrogen

• 19.4% Helium

• 3.1% Ammonia

• 1.8% Methane

• 1.1% Trace hydrocarbons

• 0.7% Silicate aerosols

• 0.4% Water vapor (upper cloud bands)

• 0.3% Ionized sulfur compounds

• ~0.1% Industrial residuals (salvage dispersal and debris emissions)