12P/Pons–Brooks is a periodic comet with an orbital period of 71 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). The next perihelion passage is 20–21 April 2024,[a] with closest approach to Earth being 1.54 AU (230 million km) on 2 June 2024.
|Discovered by||Jean-Louis Pons|
William Robert Brooks
|Discovery date||July 12, 1812|
|1812; 1884 I; 1954 VII; C/1457 A1; C/1385 U1|
|Orbital characteristics A|
|Semi-major axis||17.121 AU|
|Orbital period||70.85 yr|
|Earth MOID||0.187 AU (28.0 million km)|
|Last perihelion||May 22, 1954|
January 25, 1884
September 15, 1812
|Next perihelion||April 20–21, 2024[a]|
On 10 June 2020 Pons–Brooks was recovered at apparent magnitude 23 by the Lowell Discovery Telescope when the comet was beyond the orbit of Saturn at 11.9 AU (1.78 billion km) from the Sun. The uncertainty in the comet's heliocentric distance is roughly ±10000 km.
This section needs to be updated.(August 2020)
Comet 12P/Pons–Brooks was discovered on July 12, 1812, by Jean-Louis Pons. Independently, this comet was later found by Vincent Wisniewski on August 1, and Alexis Bouvard on August 2 the same year. At the time no-one had brought these observations together.
In 1883 a (faint) comet was accidentally discovered by William Robert Brooks and later identified with the comet of 1812. 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 1883-4 return, but searches were unsuccessful, until it was rediscovered by Brooks. This year it traveled from Scheat and Markab in western Pegasus, 13 January 1884; southward (through Pisces) to reach perihelion below Iota and Beta Ceti (~RA 0h, Dec. -10°) around 24 January.
|1884-Jan-09||0.63 AU (94 million km)||58°|
|1954-Jun-29||1.6 AU (240 million km)||38°|
|2024-Jun-02||1.5 AU (220 million km)||45°|
|2095-Aug-27||1.5 AU (220 million km)||31°|
Libration is locked at a 6:1 resonance with Jupiter. The Tisserand invariant with respect to Jupiter (J) is 0.60. Aphelion (furthest point from the Sun) is just beyond the orbit of Neptune at 33 AU (4.9 billion km).
With a steep orbital inclination of 74.2° this comet does not spend a lot of time near the ecliptic. The Jet Propulsion Laboratory's (JPL) website shows that between the years 1900 and 2200, that the comet was and will be most significantly perturbed by Saturn on July 29, 1957. At that point it passed within 1.6AU of the giant planet's influence; even this approach had negligible effect. The comet's orbit appears to be stable between 1740 and 2167, with no strong perturbations by any of the planets.
Kirkwood in 1884 noticed that Pons-Brooks shares elements with De Vico's comet of 1846. He suggested that the latter had calved off Pons-Brooks some centuries prior. Later he identified the two comets' capture into their elliptical orbits (or their parent body's capture) with their shared aphelion close to Neptune 991 CE.
On August 12-13th of 1883, Mexican astronomer José Bonilla observed 447 bodies cross the solar disc, from an observatory in Zacatecas. Mexican astronomers in 2011 suggested that a comet may have split into several pieces. These objects were estimated to have had a size of between 46 and 1022 meters, and to have passed only 538 to 8062 km from the Earth. They raised Pons-Brooks as one possibility, in which case Earth barely avoided multiple Tunguska events or even a mass extinction. This was reported in the media October 2011.
But the source of these objects could also have been comet C/1883 D1 (Brooks-Swift) or even a third, unknown comet that year. The event also coincided with the annual Perseids meteor shower. Even migrating birds cannot be ruled out.
Chinese historiography records, although long after the fact, its first comet around 1500 BCE. This "broom-star" is said to have heralded the sweeping-away of the as tyrannically described Xia dynasty (and its replacement with the Shang dynasty).
Pons–Brooks came to perihelion on May 22, 1954 when it was 1.7 AU from Earth. On 10 December 1954, the meteor stream of comet Pons–Brooks passed about 0.12 AU (18 million km) from Earth, resulting in potential meteors impacting Earth`s atmosphere at relative velocity 45 km/s. The comet was recovered in June 2020, and perihelion passage is in April 2024.
- Ephemeris generated by JPL 16 (Soln.date: 2020-Jun-29 10:49:26) has 12P/Pons-Brooks coming to perihelion at 2024-Apr-21 00:10.
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- Comet 12P/Pons-Brooks-Identical to comets C/1457 A1 and C/1385 U1 (Maik Meyer)
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