252P/LINEAR

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252P/LINEAR
300px
Sequence of images shows Comet 252P/LINEAR near Earth.[1]
Discovery
Discovered by Lincoln Near-Earth Asteroid Research (LINEAR)
Discovery date 2000/04/07
Orbital characteristics A
Epoch 2015-Aug-01 (JD 2457235.5)
Observation arc 16 years
Aphelion 5.1079 AU
Perihelion 0.9961 AU
Semi-major axis 3.0520 AU
Eccentricity 0.6736
Orbital period 5.33 years (1947 days)
Inclination 10.4046°
TJupiter 2.8
Dimensions 100-400 meters
Comet total
magnitude (M1)		 18.9 ± 1
Comet nuclear
magnitude (M2)		 22.7 ± 0.9
Last perihelion 2010/11/13
Next perihelion 2016/03/21

Comet 252P/LINEAR is a periodic comet and near-Earth object discovered by the LINEAR survey on April 7, 2000. The comet is an Earth-Jupiter family comet, meaning that it passes quite close to both Earth and Jupiter. This causes its orbit to be perturbed frequently on an astronomical timescale.[2]

The comet was thrown into the near-Earth region by Jupiter in 1785, before which it had a perihelion near that of Mars (1774–1785). Prior to this, it had a perihelion in the asteroid belt (1607–1774) and even further before was most likely a Jupiter Trojan. Even though its Jupiter MOID is nearly 0.2 AU, Jupiter remains the primary factor in its orbital disruption.

At some point before 1860, 252P/LINEAR separated from a secondary, smaller fragment discovered in January 2016, designated P/2016 BA14 (PANSTARRS).[3][4] The nucleus of the secondary is 60–200 meters wide, half that of the primary. 252P/LINEAR will get as close as 0.0356 AU (13.9 LD) to Earth on 21 March 2016 and P/2016 BA14 (PANSTARRS) will get as close as 0.0237 AU (9.2 LD) to Earth on 22 March 2016.[5]

Associated meteor shower

File:P2016 BA14.png
Goldstone radar image of P/2016 BA14
File:Paranal sky with comet.jpg
Comet 252P/LINEAR appearing as a fuzzy and greenish blob above Paranal Observatory.[6]

252P/LINEAR is predicted to perhaps make a weak new meteor shower during its 2016 approach. Peter Jenniskens and Jeremie Vaubaillon calculated that possible meteors from this comet would radiate from the constellation of Lepus, south of Orion, from a radiant at R.A. = 77.0 deg, Decl. = -16.3 deg., with a slow geocentric velocity of Vg = 11.1 km/s on March 28 and 29, when Earth reaches the comet orbit. Rates will be low. There are no encounters with the dust trails created since A.D. 1850, but instead a diffuse cloud of perturbed meteoroids ejected during 1894-1926 is calculated to be in Earth's path (see CBET telegram 4267).[7]

Quan-Zhi Ye calculated that possible meteors from comet P/2016 BA14 (PANSTARRS) would radiate from the constellation Columba, south of Lepus during the late UT hours of March 20. The radiant is at R.A. = 82 deg, Decl. = -39 deg, with geocentric velocity Vg = 14.1 km/s. Meteoroids ejected since A.D. 1750 were studied, with also no dust trail encounters found in 2016 (see CBET telegram 4259).[8]

A meteor shower has been observed with a similar orbit to 252P/LINEAR, previously known as the March Lyncids, in the constellation Lynx. It is not known for certain if the shower is related to the comet.

References

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