Published on Jan 4, 2014
While everybody else were ringing in 2014 early Wednesday morning, scientists caught sight of what appeared to be a very small asteroid — between 2 and 3 meters in size — on a potential impact trajectory with Earth.
The observation was made at the Catalina Sky Survey near Tucson, Arizona. The space rock, designated 2014 AA, may have been the first asteroid discovery of the New Year. If the space object was an asteroid, scientists, using the scant observational data that was available to them, suggest that it probably entered Earth’s atmosphere sometime between 2 p.m. EST, Wednesday, Jan. 1 and 9 a.m. EST Thursday, Jan. 2.
Three independent projections of the space object’s possible orbit were made by Bill Gray, of the Minor Planet Center in Cambridge, Massachusetts, and Steve Chesley from NASA’s Near Earth Object Program at the Jet Propulsion Laboratory in Pasadena, California. The two scientists agree that 2014 AA probably pushed its way into Earth’s atmosphere.
Using data produced by weak signals from three infrasound detections, the crisscrossing of the white lines in this image indicates a possible impact point of asteroid 2014 AA (Peter Brown/University of Western Ontario)
Using data produced by weak signals from three infrasound detections, the crisscrossing of the white lines in this image indicates possible impact points of asteroid 2014 AA (Peter Brown/University of Western Ontario)
Because of the uncertainty of the object’s orbit, 2014 AA could have fallen anywhere along an arc that extends from Central America to East Africa.
The scientists think that the object may have impacted Earth at 9 PM EST on Jan. 1, just off the coast of West Africa.
NASA said that since another asteroid, 2008 TC3, which was also between 2 to 3 meters in size, completely broke up in October 2008 as it passed over northern Sudan, it’s doubtful that asteroid 2014 AA would have made it through its rough atmospheric entry intact.
Asteroid 2008 TC3, according to NASA, was the only other example of an incoming celestial object that was discovered just prior to hitting Earth.
The scientists are continuing their research into the fate of 2014 AA. They will be analyzing data generated by a few weak signals collected from infrasound — low frequency — monitoring stations located along the predicted impact arc to see if they could be connected to the atmospheric entry of 2014 AA
Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA’s Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth’s atmosphere and many other characteristics. Daily results are presented here on Spaceweather.com.
On Jan. 4, 2014, the network reported 35 fireballs.
(19 sporadics, 14 Quadrantids, 1 lambda Bootid, 1 December Leonis Minorid)
In this diagram of the inner solar system, all of the fireball orbits intersect at a single point–Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]
On Jan. 3, 2014, the network reported 27 fireballs.
(14 sporadics, 13 Quadrantids)
In this diagram of the inner solar system, all of the fireball orbits intersect at a single point–Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue).