Vall is a curiously blue airless body and curiously, the last of them to be discovered, having been often mistaken for a pale asteroid in the inner asteroid belt whenever it was observed.

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Rational Resources Classification:

Ocean	Surface	Atmosphere	Exosphere
None	Ice-Water	None	ExoIce

From the PDF included in the download:

Bulk Params		Orbital and Rotational Params
Classification	Moon (Jool)	Semi-major Axis	160,230 km
Radius	550 km sea level, 552.3 km mean	Periapsis	155,423 km
Mass	8.00068×1021 kg	Apoapsis	165,037 km
Gravitational Parameter	5.33972×1011 m3/s2	Orbit eccentricity	0.03
Mean density	11,340 kg/m3	Orbit inclination	0.3°
Surface gravity	0.18 g ASL	Longitude of ascending node	90°
Escape velocity	1,393 m/s	Argument of periapsis	270°
Bond Albedo	0.4	Sidereal orbit period	6.5979 days
Solar irradiance	53.2 W/m2	Synodic period	6.6084 days
Black-body temperature	109 K	Mean orbital velocity	3,532 m/s
		Sidereal rotation period	6.5979 days
		Solar day	6.6084 days
		Synchronous orbit altitude	N/A
		Sphere of influence	5,962 km