19 Fortuna
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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.<ref name=Hubble2005>Template:Cite journal</ref> The spectra of the asteroid displays evidence of aqueous alteration.<ref name=Fornasier1999>Template:Citation</ref>
Discovery and naming
It was discovered by J. R. Hind on 22 August 1852, and named after Fortuna, the Roman goddess of luck. Its historical symbol was a star over Fortune's wheel; it was encoded in Unicode 17.0 as U+1CECC (.svg){kind=small}
).<ref name=astunicode>Template:Cite web</ref><ref name="Unicode-1CEC0">Template:Cite web</ref>
Physical characteristics
The Hubble Space Telescope observed Fortuna in 1993. It was resolved with an apparent diameter of 0.20 arcseconds (4.5 pixels in the Planetary Camera) and its shape was found to be nearly spherical. Satellites were searched for but none were detected.
Stellar occultations by Fortuna have been observed several times. Fortuna has been studied by radar.<ref name="detected">Template:Cite web</ref>
Fortuna has been perturbed by the 80 km 135 Hertha and was initially estimated by Baer to have a mass of 1.08Template:E kg.<ref name="Baer2007">Template:Cite journal</ref> A more recent estimate by Baer suggests it has a mass of 1.27Template:E kg.<ref name=Baer/>
On 21 December 2012, Fortuna (~200 km) harmlessly passed within 6.5 Gm of asteroid 687 Tinette.<ref>Generated with Solex 10 Template:Webarchive by Aldo Vitagliano</ref>
Notes
References
External links
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