23P/Brorsen-Metcalf
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| Discovery | |
|---|---|
| Discovered by: | Theodor Brorsen and Joel Metcalf |
| Discovery date: | July 20, 1847 |
| Alternate designations: | 1847 O1, 1919 Q1, 1989 N1 |
| Orbital characteristics A | |
| Epoch: | October 1, 1989 |
| Perihelion distance: | 0.478 AU |
| Semi-major axis: | 17.07 AU |
| Eccentricity: | 0.972 |
| Orbital period: | 70.52 a |
| Inclination: | 19.33° |
| Last perihelion: | September 11, 1989 |
| Next perihelion (predicted): | June 8, 2059 |
Comet Brorsen-Metcalf is a periodic comet in our solar system that was first discovered by Theodor Brorsen (Altona, Germany) on July 20, 1847, and again by Kaspar Schweizer (Moscow) on August 11, 1847, the prediction was made it would return between 1919 and 1922.
On August 21, 1919, the comet was recovered by Reverend Joel Hastings Metcalf (Camp Idlewild, Vermont, USA) as 8th magnitude. Additional discoveries were made by Edward Barnard (Yerkes Observatory, Wisconsin, USA) on August 22, Michel Giacobini (Paris, France), Ostrovlev (Theodosia, Crimea) and Selavanov (St. Petersburg). By the end of September 1919 it was confirmed as being the same as Brorsen's comet.
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