Observations by amateurs helped researchers determine that the 168-mile-wide asteroid (87) Sylvia appears to have a dense core surrounded by a layer of relatively fluffy material. Further, the space rock's larger moon is about 15 miles wide.
Shape of Huge Asteroid with 2 Moons Revealed By SETI, Amateur Astronomers
SPACE.com - 7 Oct 2013 22:34
Observations by amateurs helped researchers determine that the 168-mile-wide asteroid (87) Sylvia appears to have a dense core surrounded by a layer of relatively fluffy material. Further, the space rock's larger moon is about 15 miles wide.
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