23P/Brorsen-Metcalf

Infobox Comet
name=23P/Brorsen-Metcalf


caption=
discoverer=Theodor Brorsen and Joel Metcalf
discovery_date=July 20, 1847
designations=1847 O1, 1919 Q1, 1989 N1
epoch=October 1, 1989
aphelion=
perihelion=0.478 AU
semimajor=17.07 AU
semiminor=
orbital_circ=
eccentricity=0.972
period=70.52 a
avg_speed=
max_speed=
min_speed=
inclination= 19.33°
last_p=September 11, 1989
next_p=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 (Saint Petersburg). By the end of September 1919 it was confirmed as being the same as Brorsen's comet.

External links

* [http://cometography.com/pcomets/023p.html 23P at Kronk's Cometography]
* [http://www9.ocn.ne.jp/~comet/pcmtn/0023p.htm 23P at Kazuo Kinoshita's Comets]
* [http://www.aerith.net/comet/catalog/0023P/index.html 23P at Seiichi Yoshida's Comet Catalog]