12P/Pons–Brooks

12P/Pons–Brooks
12P/Pons–Brooks
Discovery
Discovered by: Jean-Louis Pons
William Robert Brooks
Discovery date: July 12, 1812
Alternate designations: 1812; 1884 I; 1954 VII
Orbital characteristics A
Epoch: 1954-Sep-15[1]
Aphelion distance: 33.468 AU
Perihelion distance: 0.77366 AU
Semi-major axis: 17.1212 AU
Eccentricity: 0.95481
Orbital period: 70.85 yr
Inclination: 74.176°
Last perihelion: May 22, 1954
January 25, 1884
September 15, 1812
Next perihelion: April 21, 2024[2]

12P/Pons–Brooks is a periodic comet with a period of 71 years. The comet was suggested by Carl Sagan as the spectacular comet seen by the Chinese in 1486 BCE which, according to historical researcher Graham Phillips, might have inspired the rise of a number of monotheistic religions around the world[citation needed]. Fragments of the comet may have barely missed Earth in 1883. It will next appear in 2024.[2]

Contents

Discovery

12P/Pons–Brooks was discovered on July 12, 1812 by Jean-Louis Pons. Independently, it was later found by Vincent Wisniewski on August 1, and Alexis Bouvard on August 2 the same year. In 1883 it was accidentally "discovered" by William Robert Brooks and later identified as the same object. Shortly after its initial discovery it was found to have an orbital period of about 70 years with an error of about 5 years. Johann Franz Encke determined a definitive orbit with a period of 70.68 years. This orbit was used to generate an ephemeris for the 1883 return, but searches were unsuccessful, until it was rediscovered by Brooks.

Orbit

With a steep orbital inclination of 74.2° this comet does not spend a lot of time near the ecliptic where it is easiest to interact with other bodies. The comet's orbit appears to be stable between 1740 and 2167, with no strong perturbations by any of the planets.[3] The Jet Propulsion Laboratory's (JPL) website shows that between the years 1900 and 2200, that the comet is only noticeably perturbed by Saturn on July 29, 1957, when it passes within 1.6AU of the giant planet's powerful influence.[4]

Bonilla's comet

Mexican astronomers have suggested that a comet may have split into several pieces around 1883 and that Earth barely avoided multiple Tunguska events or even a mass extinction.[5] On August 12-13th of 1883, Mexican astronomer José Bonilla observed 447 bodies cross the solar disc.[5] These objects were estimated to have had a size of between 46 and 1022 meters,[5] and to have passed only 538 to 8062 km from the Earth.[5] But the source of these objects could also have been an unknown comet or comet C/1883 D1 (Brooks-Swift).[5] The event also coincided with the annual Perseids meteor shower. Even migrating birds can not be ruled out.[5]

References

  1. ^ "JPL Small-Body Database Browser: 12P/Pons-Brooks". Jet Propulsion Laboratory. 1954-08-23 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=12P. Retrieved 2011-10-17. 
  2. ^ a b 12P/Pons-Brooks – Seiichi Yoshida @ aerith.net
  3. ^ Kronk, Gary W. (2001–2005). "12P/Pons-Brooks". Archived from the original on 2009-05-09. http://cometography.com/pcomets/012p.html. Retrieved 2009-05-07.  (Cometography Home Page)
  4. ^ "JPL Close-Approach Data: 12P/Pons-Brooks". 1954-08-23 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=12P;cad=1#cad. Retrieved 2009-05-06. 
  5. ^ a b c d e f Manterola, Hector Javier Durand; Maria de la Paz Ramos Lara, Guadalupe Cordero (2011). "Interpretation of the observations made in 1883 in Zacatecas (Mexico): A fragmented Comet that nearly hits the Earth". arXiv. arXiv:1110.2798. 

External links

Periodic comets (by number)
Previous
11P/Tempel-Swift-LINEAR
12P/Pons–Brooks Next
13P/Olbers

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  • 12P/Pons-Brooks — Données Période de révolution 70,9 ans Excentricité 0,955 Inclinaison de l orbite 74,2 degrés Découverte 1812 Découvreur Jean Louis Pons 12P/Pons Brooks est la désignation d une com …   Wikipédia en Français

  • 12P/Pons Brooks — Données Période de révolution 70,9 ans Excentricité 0,955 Inclinaison de l orbite 74,2 degrés Découverte 1812 Découvreur Jean Louis Pons 12P/Pons Brooks est la désignation d une com …   Wikipédia en Français

  • 12P/Pons-Brooks — Infobox Comet name=12P/Pons Brooks discoverer=Jean Louis Pons William Robert Brooks discovery date=July 12, 1812 designations=1812; 1884 I; 1954 VII epoch= semimajor=17.13 AU perihelion=0.77 AU aphelion=33.8 AU eccentricity=0.955 period=70.9 a… …   Wikipedia

  • 12p — ist die Abkürzung für: 12P/Pons Brooks, ein Komet Die Abkürzung 12p steht für Trisomie 12p, eine Behinderung auf der Grundlage einer Genommutation Tetrasomie 12p, eine Behinderung auf der Grundlage einer Genommutation, siehe Pallister Killian… …   Deutsch Wikipedia

  • 12P — ist die Abkürzung für: 12P/Pons Brooks, ein Komet Die Abkürzung 12p steht für Trisomie 12p, eine Behinderung auf der Grundlage einer Genommutation Tetrasomie 12p, eine Behinderung auf der Grundlage einer Genommutation, siehe Pallister Killian… …   Deutsch Wikipedia

  • 12P/Понса — Брукса — Открытие Первооткрыватель: Ж. Л. Понс Дата открытия: 12 июля 1812 Альтернативные обозначения: 1812; 1884 I; 1954 VII Характеристики орбиты Афелий: 33,8 а. е. Перигелий …   Википедия

  • 12P/Понса — Брукса Открытие Первооткрыватель: Ж. Л. Понс Дата открытия: 12 июля 1812 Альтернативные обозначения: 1812; 1884 I; 1954 VII Характеристики орбиты Афелий: 33,8 а. е. Перигелий: 0,77 а. е. Большая полуось …   Википедия

  • Pons — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom.  Pour l’article homophone, voir Ponce (homonymie). Pons ou Ponce peut désigner : Sommaire …   Wikipédia en Français

  • Comet Pons — may refer to any one of these comets: C/1801 N1 C/1802 Q1 C/1804 E1 C/1806 V1 (a.k.a. 1806 II) C/1808 F1 (a.k.a. 1808 I) C/1808 M1 (a.k.a. 1808 II) C/1810 Q1 C/1811 W1 (a.k.a. 1811 II) C/1813 C1 (a.k.a. 1813 I) C/1813 G1 (a.k.a. 1813 II) C/1816… …   Wikipedia

  • Comet Brooks — may refer to any one of 17 comets: C/1885 R1 (a.k.a. 1885 III, 1885c) C/1885 Y1 (a.k.a. 1885 V, 1885f) C/1886 H1 (a.k.a. 1886 V, 1886a) C/1886 J1 (a.k.a. 1886 III, 1886b) D/1886 K1 (a.k.a. 1886 IV, 1886c) C/1887 B2 (a.k.a. 1887 II, 1887b) C/1888… …   Wikipedia

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