Atlân is in the same orbit as Daia, at his L₃ point.
Mass: 4·640,24e24 kg (0·777 Earth's)
Core mass factor: 35·2%
Density: 5·32 g/cm³
Radius: 5'927·60 km (0·930 Earth's)
Gravity: 8·805 m/s² (0·898 g)
Escape velocity: 10·22 km/s (0·914 Earth's)
Axial tilt: 3·9° (prograde rotation)
Tropics: 3·9°
Polar circles: 86·1°
Albedo: 0·29 (provisional)
Greenhouse effect: 1 (provisional)
Avg. surface temp.: 291 K (18 °C)
Rotation period: 108'000 s (30 h)
Semi-major axis: 179'981'946 km (1·203 au)
Eccentricity: 0
Orbital period: 39'528'000 s (366 local days)
Atmospheric pressure: 96·488,25 kPa (0·952,5 atm)
Nitrogen: 64·9%
Oxygen: 35%
Argon: 0·07%
Carbon diöxide: 0·03%
Atmospheric density: 1·177 kg/m³