Open Access Articles- Top Results for Brorsen%E2%80%93Metcalf


Discovered by Theodor Brorsen and Joel Metcalf
Discovery date July 20, 1847
1847 O1, 1919 Q1, 1989 N1
Orbital characteristics A
Epoch October 1, 1989
Aphelion 33.65 AU
Perihelion 0.478 AU
Semi-major axis 17.07 AU
Eccentricity 0.972
Orbital period 70.52 a[1]
Inclination 19.33°
Last perihelion September 11, 1989[1]
Next perihelion June 8, 2059[2][3]

Comet Brorsen–Metcalf is a periodic comet with an orbital period of 70 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years).[1] It 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 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.


  1. ^ a b c "JPL Small-Body Database Browser: 23P/Brorsen-Metcalf". Jet Propulsion Laboratory. 1989-09-09 last obs. Retrieved 2011-10-17.  Check date values in: |date= (help)
  2. ^ Seiichi Yoshida (2005-11-09). "23P/Brorsen-Metcalf". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-19. 
  3. ^ Horizons output. "Observer Table for Comet 23P/Brorsen-Metcalf (1989)". Retrieved 2012-02-19.  (Observer Location:@sun)

External links

Periodic comets (by number)
23P/Brorsen–Metcalf Next

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