Pantheus System

Template:Star SystemThe Pantheus System, also known as EGC-13, AELNIS-1 or RS-8496-928-6-91668-45 is a .990 star system located in the fringes of the Orion Arm in the Milky Way. Pantheus is a binary system, consisting of a 1.26 M_☉ F9 spectral class star, known as Pantheus A (Cthnos), and a .67 M_☉ K5 spectral class star, known as Pantheus B (Klintriarch). From Sol, Pantheus appears as a magnitude 11.78 star in the constellation of Crater.

Both stars in the system have complicated planetary systems. Cthnos has eleven planets and twenty rounded moons, while Klintriarch has a system of twelve planets and 22 rounded moons. The majority of the system's mass resides in the Cthnoite system as it is orbited by five J-class planets, all of which have masses exceeding that of Jupiter. The Klintriarchian system by comparison is predominantly N-class and I-class planets.

The Pantheus System was first catalogued in early sky surveys of the 20th and 21st centuries. Interest in the system began when famous human explorer Sylvester Arsiza visited in 2245 and documented the system, adding it to his Expansion General Catalogue as EGC-13. When Arsiza later created Arsiza's List of Notable Interstellar Systems, Pantheus was classified as AELNIS-1.

Although Sylvester Arsiza would later discover more unique systems, the Pantheus System remains significant as one of his favorites, and one of the first he put considerable effort into investigating. The system is well known today among local residents of the Confederacy of Humanity. It is now administered as a historic location, offering tours of the system to visitors and drawing in a moderate attendance rate.

Location

The closest stellar systems and R-class planets to the Pantheus System.

The Pantheus System is located in the the same place as Earth, the Orion Arm of the Milky Way Galaxy. Pantheus is below the majority of galactic plane, resulting in a significant contrast between its view of the Milky way and the rest of the sky.

The closest stars system to Pantheus is the Abbaca Proxima system, at 4.14 ly away. The next nearest star systems are the Biother system (5.21 ly away) and the Biasint System (5.63 ly away), both of which have bodies with multicellular life. The closest R-Class planet to Pantheus is Akkurath, at 3.06 ly away. It is close enough to the system where Cthnos and Klintriarch appear as distinct stars if viewed from its surfcace.

The Solar System is 1,360.39 light years away from Pantheus.

System Architecture

Orbits of the suns of the Pantheus System. Barycenter shown in teal.

Pantheus is a binary system, with both Cthnos and Klintriarch orbiting a central Barycenter. Both orbits intersect, and Cthnos is the inner of the two orbits, having a pericenter of 139.26 AU and an apocenter of 419.39 AU. Klintriarch's orbit has a pericenter of 263.67 AU and an apocenter of 794.07 AU. The stars orbit with a 1:1 resonance, with both stars completing an orbit every 20,283 terran years. Cthnos travels at 952 mph while Klintriarch travels at 1,737 mph.

Both planetary systems have significantly deviant orbital planes. The Cthnoite planetary system is angled 50° relative to the plane of the system, while the Klintriarchian planetary system is angled 230° relative to the plane of the system.

The Pantheus system has no circumbinary planets.

Planets

The Pantheus system has a total of 23 planets, eleven of which are around Cthnos and twelve of which are around Klintriarch. The majority of the Panthian planets are gas giants, most of which have moons massive enough to undergo hydrostatic equilibrium, and some large enough to sustain liquid cycles and atmospheres. There are a total of 65 planetary mass objects in the Pantheus System.

Cthnos

The eleven Cthonite planets are generally more vast and massive than those of Klintriarch. The system alternates between massive gas giants and modest terrestrial planets.

Heaphance

Heaphance of Cthnos

The first planet from Cthnos, Heaphance is a hot J-class world. Despite being only the second most massive of the Cthnoite gas giants, its proximity to Cthnos renders Heaphance the largest planet in the Pantheus System. Heaphance is naturally a dark lavender color, but the thermal radiation it emits makes it appear red and yellow.

Heaphance is 3.9 Jupiter masses, has a diameter of 98,208 miles, orbits 16,732,045 miles from Cthnos, has a day length of 10h58m, a year length of 25.69 days and an axial tilt of 12.19 degrees.

Heaphance has 23 dwarf moons, but given its proximity to its sun, Heaphance has no large moons.

The planet is large enough to be seen as a prominent disk in the sky of Oaven, where it can appear as large as 13 arcminutes across.

Oaven

Oaven of Cthnos

The second planet from Cthnos, Oaven is a torrid A-class Venus analogue, and by far the hottest Panthian planet. The surface of Oaven is covered in volcanos and geologic scarring, and the planet is covered in 2000 degree weather facilitated by its immense atmosphere of water vapor and carbon dioxide.

Oaven is 1.9 Earth masses, has a diameter of 9,302 miles, orbits 42,759,671 miles from Cthnos, has a day length of 17h58m, a year length of 100.35 days and an axial tilt of 12.14 degrees.

Oaven has no moons.

Geltrest

Geltrest of Cthnos

The third planet from Cthnos, Geltrest is a warm J-class planet