Elizabeth Olsen was born.
54 Alexandra is a very large and dark main-belt asteroid .. main-belt. main-belt. asteroid. 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 .. Alexander von Humboldt. Alexander von Humboldt. asteroid. asteroid. Hermann Goldschmidt. Hermann Goldschmidt. On May 17 , 2005 , this asteroid occulted a faint star -LRB- magnitude 8.5 -RRB- and the event was observed and timed in a number of locations within the U.S. and Mexico .. asteroid. asteroid. magnitude. Magnitude ( astronomy ). Mexico. Mexico. As a result , a silhouette profile was produced , yielding a roughly oval cross-section with dimensions of 160 × 135 km -LRB- ± 1 km -RRB- .. silhouette. silhouette. 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 .. asteroid. asteroid. magnitude. Magnitude ( astronomy ). Photometric. Photometry ( astronomy ). light curve. light curve. Alexandra has been studied by radar .. radar. radar astronomy. 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 .. C-type asteroid. asteroid. asteroid. asteroid family. asteroid family. orbital elements. orbital elements. Other members included 70 Panopaea and 145 Adeona .. 70 Panopaea. 70 Panopaea. 145 Adeona. 145 Adeona. 145 Adeona was subsequently assigned to the Adeona family , with Alexandra and Panopaea being dropped .. 145 Adeona. 145 Adeona. Adeona family. Adeona family