Historedia
Episode 1 of 2

Discovery of Ceres

When
1 January 1801
Where
Palermo Astronomical Observatory
Part of
Giuseppe Piazzi discovers Ceres, the first asteroid

Piazzi discovered a moving stellar object at Palermo on 1 January 1801, identifying it as the predicted missing planet.

Piazzi observed a 'stellar object' moving against the background of stars at the Palermo Astronomical Observatory. This object was the first identified in the asteroid belt. The discovery occurred before Piazzi received an invitation to join von Zach's search group, fulfilling the Titius-Bode law prediction.

Sources

  1. Giuseppe Piazzi Wikipedia, revision of 2026-09-04
  2. Ceres (dwarf planet) Wikipedia, revision of 2026-09-29

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.