High Quality Content by WIKIPEDIA articles! 19 Fortuna is one of the largest main belt asteroids. It has a composition similar to 1 Ceres: a darkly colored surface that is heavily space weathered with the composition of primitive organic compounds, including tholins. Fortuna is 225 km in diameter and has one of the darkest known geometric albedos for an asteroid over 150 km in diameter. Its albedo has been measured at 0.028 and 0.037. The Hubble Space Telescope observed Fortuna in 1993. It was resolved with an apparent diameter of 0.20 arcseconds and its shape was found to be nearly spherical. Satellites were searched for but none were detected.

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