2012 FN

2012 FN is an Apollo asteroid and a near-Earth object^[1] that has a 1 in 4 billion chance of impacting Earth on 7 March 2113.^[2] It is estimated to be 5 meters in diameter, which means that it poses no threat if it impacts Earth. An impact would have the kinetic energy of about 3 kt of TNT,^[2] and would probably result in an air burst in the upper atmosphere. It is the least threatening asteroid listed on the Sentry Risk Table.^[3] The very short observation arc of only 3 hours^[2] results in a very poorly constrained orbit, and it could just as easily be 2 AU from Earth on 7 March 2113.^[4]

2012 FN

Discovery
Discovered by	Mount Lemmon Survey (G96)
Discovery date	17 March 2012
Designations
Minor planet category	Apollo NEO[1]
Orbital characteristics[1]
Epoch 17 March 2012 (JD 2456003.5)
Uncertainty parameter 9
Aphelion	1.4500 AU (216.92 Gm)
Perihelion	0.99291 AU (148.537 Gm)
Semi-major axis	1.2214 AU (182.72 Gm)
Eccentricity	0.18710
Orbital period (sidereal)	1.35 yr (493.07 d)
Mean anomaly	21.742°
Mean motion	0° 43m 48.432s /day
Inclination	3.2329°
Longitude of ascending node	356.91°
Argument of perihelion	147.89°
Earth MOID	0.015601 AU (2.3339 Gm)
Jupiter MOID	3.54794 AU (530.764 Gm)
Physical characteristics
Dimensions	~5 meters (16 ft)
Absolute magnitude (H)	29.2[1]

See also

• List of Apollo asteroids
• 2012 FP35