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54 Alexandra

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Discovery date  September 10, 1858
Aphelion  485.483 Gm (3.245 AU)
Semi-major axis  405.763 Gm (2.712 AU)
Orbits  Sun
Discoverer  Hermann Goldschmidt
Discovery site  Paris Observatory
Minor planet category  Main belt
Perihelion  326.043 Gm (2.179 AU)
Discovered  10 September 1858
Spectral type  C-type asteroid
Named after  Alexander von Humboldt
54 Alexandra httpsuploadwikimediaorgwikipediacommonsthu
Discovered by  Hermann Mayer Salomon Goldschmidt
Similar  Hermann Goldschmidt discoveries, Other celestial objects

54 Alexandra is a very large and dark main-belt asteroid. It was discovered by German-French astronomer Hermann Goldschmidt on September 10, 1858, and named after the German explorer Alexander von Humboldt; it was the first asteroid to be named after a male.

On May 17, 2005, this asteroid occulted a faint star (magnitude 8.5) and the event was observed and timed in a number of locations within the U.S. and Mexico. As a result, a silhouette profile was produced, yielding a roughly oval cross-section with dimensions of 160 × 135 km (± 1 km).

Photometric observations of this asteroid during 1990–92 gave a light curve with a period of 18.14 ± 0.04 hours and a brightness variation of 0.10 in magnitude. Alexandra has been studied by radar. It was the namesake and largest member of the former Alexandra asteroid family; a dynamic group of C-type asteroids that share similar orbital elements. Other members included 70 Panopaea and 145 Adeona. 145 Adeona was subsequently assigned to the Adeona family, with Alexandra and Panopaea being dropped.

References

54 Alexandra Wikipedia


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