Earth is expected to get to visitors from outer space later this month as 2 comets known as Comet 252P/LINEAR and Comet P/2016BA14 do fly bys (from safe distances) on March 21 and 22 respectively.
Comet P/2016 BA14 was originally discovered by astronomers at the University of Hawaii’s PanSTARRS telescope on Haleakala (Maui) on Jan. 22, 2016, and was first thought to be an asteroid. However, follow-up observations by a University of Maryland and Lowell Observatory team with the Discovery Channel Telescope showed a faint tail, revealing that it was indeed a comet. They also found that the orbit of this newly discovered comet held yet another surprise, following an unusually similar orbit to that of comet 252P/LINEAR, which was discovered by the Massachusetts Institute of Technology’s Lincoln Near Earth Asteroid Research (LINEAR) survey on April 7, 2000. The apparent coincidence may be an indication of twin nature in that comet. P/2016 BA14 is roughly half the size of comet ?252P/LINEAR and might be “a fragment that calved off sometime in the larger comet’s past,” According to Paul Chodas, manager of NASA’s Center of NEO Studies (CNEOS) at the Jet Propulsion Laboratory in Pasadena, California.
“We know comets are relatively fragile things, as in 1993 when comet Shoemaker-Levy 9 was discovered and its pieces linked to a flyby of Jupiter. Perhaps during a previous pass through the inner-solar system, or during a distant flyby of Jupiter, a chunk that we now know of as BA14 might have broken off of 252P,” he continued.
Observations made by the Hubble Space Telescope of comet 252P/LINEAR, and by NASA’s Infrared Telescope Facility of comet P/2016 BA14 will further investigate their possible twin nature.
Comet 252P/LINEAR, approximately 750 feet) in size, will zip past Earth on Monday, March 21 at a range of about 3.3 million miles. The following day, comet P/2016 BA14 will safely fly by our planet at a distance of about 2.2 million miles. This will be the 3rd closest flyby of a comet in recorded history next to comet D/1770 L1 (Lexell) in 1770 and comet C/1983 H1 (IRAS-Araki-Alcock) in 1983.
The time of closest approach for Comet 252P/LINEAR on March 21 will be around 5:14 a.m. PDT (8:14 a.m. EDT). The time of closest approach for P/2016 BA14 on March 22 will be around 7:30 a.m. PDT (10:30 a.m. EDT). While both comets will safely fly past at relatively close distances, anyone hoping to see them will need powerful, professional-grade telescopes, due to their relatively small size.
“March 22 will be the closest comet P/2016 BA14 gets to us for at least the next 150 years,” noted Chodas.
Source: NASA Jet Propulsion Lab