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08.001 Small planets

 

Joachim Herrmann
dtv-Atlas zur Astronomie (dtv Atlas to Astronomy), 1973
Page 95 Small planets

In the New Year’s night 1800/1801 G. Piazzi discovered a small planet, which runs between Mars and Jupiter and was given the name Ceres. The discoveries of Pallas in the year 1802 through Olbers, Juno 1804 through Harding and Vesta 1807 again through Olbers followed. Then it remained silent for several decades, until K. Hencke 1845 found Asträa and 1847 Hebe. Since then not a single year passed in which not new small planets were discovered.

Today over 1 750 small planets (asteroids or planetoids) are so well known that their orbits are essentially secured; but far above 7 000 have already been found. Above all after the introduction of photographic discovery methods through K. Wolf 1891 the number rose suddenly, but by far not all found small planets could be »secured«.

 

 

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