23P/Brorsen–Metcalf
AU | |
| Eccentricity | 0.972 |
|---|---|
| Orbital period | 70.52 yr[1] 69y 8m 28d (perihelion to perihelion) |
| Max. orbital speed | 60.2 km/s @ perihelion[2] |
| Inclination | 19.33° |
| Last perihelion | September 11, 1989[1] |
| Next perihelion | June 8, 2059[2][3][4] |
23P/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 at the Altona Observatory on July 20, 1847, and again by Kaspar Schweizer (Moscow) on August 11, 1847. It was predicted that it would reappear between 1919 and 1922.
On August 21, 1919, the comet was recovered by
The comet became visible with naked eye as a small hazy spot of light and on 6 October 1919 it was estimated to have a magnitude of 4.5. The comet had a slender tail with a length of 8,5 degrees. On the photographs of the comet on 22 October 1919 a disconnection event of the tail was visible, that probably started on 20 October.[5]
The comet was recovered by the
References
- ^ a b c "JPL Small-Body Database Browser: 23P/Brorsen-Metcalf". Jet Propulsion Laboratory. Retrieved October 17, 2011.
last obs. used 1989-09-09
- ^ a b "Horizons Batch for 23P/Brorsen-Metcalf (90000342) on 2059-Jun-08" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 2022-06-27. Retrieved 2022-06-27. (JPL#13 Soln.date: 2002-Mar-01)
- ^ Kinoshita, Kazuo (2003-05-29). "23P/Brorsen-Metcalf past, present and future orbital elements". Comet Orbit. Retrieved 2023-07-29.
- ^ Seiichi Yoshida (2005-11-09). "23P/Brorsen-Metcalf". Seiichi Yoshida's Comet Catalog. Retrieved February 19, 2012.
- ISSN 0004-637X.
- ISBN 9781139033947.
- doi:10.1086/169527.
External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 23P at Kronk's Cometography
- 23P at Kazuo Kinoshita's Comets
- 23P at Seiichi Yoshida's Comet Catalog
.png)
