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121 Hermione

Asteroid
Hermione is a very large binary asteroid discovered in 1872. It orbits in the Cybele group in the far outer asteroid belt. As an asteroid of the dark C spectral type, it is probably composed of carbonaceous materials. In 2002, a small moon was... Wikipedia
Orbital period: 2,344 days
Radius: 59.03 mi
Discovered: May 12, 1872
Mass: ~1.6×1015 kg
Minor planet category: main-belt · Cybele
Orbital period (sidereal): 2.582 ± 0.002 d