Tarkkailija
Tarkkailija
Orbital characteristics
| Semi-major axis | 122,447 km |
|---|---|
| Eccentricity | 0.057 |
| Orbital period | 5.914 d |
| Inclination | 7.37° to Selviytyä's equator |
Physical characteristics
| Radius | 0.75 Moons |
|---|---|
| Mass | 0.52 Moons |
| Mean density | 4.11 g/cm3 |
| Surface gravity | 0.153 g |
| Synodic rotation period | 5.914 d (Tidally locked) |
| Axial tilt | 1.33° |
| Temperature | ~280 K |
Tarkkailija is a moon of Selviytyä. It is Selviytyä's only natural satillite and has been orbiting it for about 10 billion years.
Nomenclature
Tarkkailija is Finnish for "observer".
General characteristics
Tarkkailija is a moon of Selviytyä and was likely formed by a large impact early in Selviytyä formation, which could also be the cause for Selviytyä's high axial tilt.
The interior of Tarkkailija is predominantly solid with a partially molten inner core and mantle. It is unknown whether volcanic activity is still present on Tarkkailija, but recent evidence suggests that lava flows happened as recent as a few thousand years ago. The side facing Selviytyä has more dark patches, suggesting that lava flows used to be more common on the Selviytyä facing side of Tarkkailija.