Eris

Eris is a dwarf planet in the Kuiper belt, discovered in 2005. While it is slightly smaller than Pluto physically, it is about 27% more massive than Pluto, and this resulted in it initially being considered a tenth planet, until the International Astronomical Union created the "dwarf planet" category to group objects like Pluto and Eris together.

In Terra Invicta, Eris is only added to the solar system if the "Massive Solar System" option is chosen at game start. It is a relatively large body, with 9 hab sites (plus one more on its moon Dysnomia). However, Eris is also far more distant from the Sun than any other body in the game save Gonggong, with both having orbital radii almost 20 AU larger than any other body in the game. Eris can only be visited once the Mission to the Outer Planets tech has been researched.

Basic Information

Parameter	Value
Diameter	2,326 km
Orbits	Sol (Sun)
Orbital Period	556.86 Earth years
Distance from Sun	67.68 AU
Atmosphere	None
Habitation Sites	9
Satellites	Dysnomia
Available Orbits	Low Eris Orbit Medium Eris Orbit High Eris Orbit

Mining Sites

Notes:

• Negative values are not a bug, the game actually sets the median to a negative value to make it incredibly unlikely for the site to have a positive mine output. But note that the actual mined amount cannot actually be negative.
• Blank values indicate that the site can never produce this resource. In contrast, 0 indicates that there is still up to 50% chance for the site to produce the resource.
• Values shown do not take into account the final capping of the Noble Metals output to just 1/2 or 1/3 of the Base Metals output.
• Top 50% Mean is the average value of the top 50% of possible rolls. It is also a much looser estimate than the median because it cannot handle edge cases such as where the mininum value is too close to the median value.

MedianTop 50% Mean

Site Name	Parent Body	Mining Profile	Max Hab Tier	Median Resources (after Mass/Density Modifiers)
Lao Ma Facula	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Amarice Dorsum	Eris	Diverse Icy Planetoid	4	75	25	15	8	0
Varia Macula	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Joxer Catena	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Mons Virgilis	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Borias Planitia	Eris	Diverse Icy Planetoid	4	75	25	15	8	0
Eve Dorsum	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Ephiny Catena	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Xena Dorsum	Eris	Volatile-Rich Planetoid	4	65	70	10	5	0
Total: 9 Hab Sites				605	540	100	51	0

Site Name	Parent Body	Mining Profile	Max Hab Tier	Estimated Top 50% Mean Resources (after Mass/Density Modifiers)
Lao Ma Facula	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Amarice Dorsum	Eris	Diverse Icy Planetoid	4	77.5	33.571	28.333	12.286	0.5
Varia Macula	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Joxer Catena	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Mons Virgilis	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Borias Planitia	Eris	Diverse Icy Planetoid	4	77.5	33.571	28.333	12.286	0.5
Eve Dorsum	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Ephiny Catena	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Xena Dorsum	Eris	Volatile-Rich Planetoid	4	67.5	75	16.429	9.286	0.214
Total: 9 Hab Sites				627.5	592.143	171.667	89.571	2.5