Gilly is a lumpy rock wandering around the orbit of Eve. It was once and for a long time believed to be the smallest natural satellite that the Kerbal Astronomical Society ever discovered, but that changed when the concept of colonizing the asteroid field suddenly became very interesting to those who weren't afraid of it.

Gilly remains as easy as ever, if you discount its greater size and lessened Ore abundance versus its stock configuration. It is also no longer the smallest celestial in the entire system, falling to 🥉 3rd place behind 🥈 Dak and 🥇 Tam.

Rational Resources Classification:

Ocean	Surface	Atmosphere	Exosphere
None	Rock-Metal	None	None

From the PDF included in the download:

Bulk Params		Orbital and Rotational Params
Classification	Moon (Eve)	Semi-major Axis	86,920 km
Radius	30 km sea level, 33.0 km mean	Periapsis	39,114 km
Mass	9.91820×1017 kg	Apoapsis	134,726 km
Gravitational Parameter	6.61949×107 m3/s2	Orbit eccentricity	0.55
Mean density	6,580 kg/m3	Orbit inclination	12°
Surface gravity	0.0075 g ASL	Longitude of ascending node	80°
Escape velocity	66 m/s	Argument of periapsis	10°
Bond Albedo	0.25	Sidereal orbit period	15.517 days
Solar irradiance	2,602 W/m2	Synodic period	16.669 days
Black-body temperature	305 K	Mean orbital velocity	815 m/s
		Sidereal rotation period	15.517 days
		Solar day	16.669 days
		Synchronous orbit altitude	N/A
		Sphere of influence	366 km