Lumenna-Súnáris System (2): Eurymir

(Or maybe a little more often, if I happen to feel like it; also, a shout out to Wolfram Alpha, whose fine facilities make running the necessary calculations a great deal easier.)

I/1. Eurymir

Class: Eurymic
Orbit (period): 0.21 au (35.15 T-days)
Orbit (ecc.): 0.05
Radius: 1,758.5 miles
Mass: 4.712 x 10²³ kg
Density: 4.96 g/cm³
Surface gravity: 0.4 g

Axial tilt: 3.9°
Rotation period: 35.15 T-days (tide-locked)

Black-body temperature: 577 K
Surface temperature (avg., sunside): 672 K
Surface temperature (avg., nightside): 56 K

Atmosphere: None.
Hydrographic coverage: 0%

Satellites: None.

The innermost planet of Lumenna, Eurymir is similar to Mercury as we once imagined it, which is to say, tide-locked, with a sunward face hot enough to have lakes of molten metal and roast anyone on even momentary exposure, and a dark face plunged into deepest chill, even occasionally to the extent of having water ice. The mind boggles…

Unlike Mercury, though, Eurymir can muster up some volcanic activity, especially on its sunward face: the tidal stresses also keep its core molten and perking right along.

(Being the fine, inhospitable world it is, it’s not all that populated even in the future. It houses a fascinating experimental a-life ecology, but apart from that, its principal use is as a gravity anchor for solar power stations and antimatter generators.

Its best-known settlement is actually a temple: because when you have a solar deity, where would be the best place to put that but the nearest solid ground to the eponymous sun?)