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2002 MN
Discovery
Discovered by	MIT Lincoln Laboratory
Discovery date	17 June 2002
Designations
Minor planet category	Apollo; NEO;
Orbital characteristics
	Epoch 17 October 2024 (JD 2460600.5)
	Uncertainty parameter 0
Observation arc	22.04 yr
Aphelion	2.7238 AU (407.47 Gm)
Perihelion	0.90867 AU (135.935 Gm)
Semi-major axis	1.8162 AU (271.70 Gm)
Eccentricity	0.49969
Orbital period (sidereal)	2.4477 yr (894.03 d)
Mean anomaly	62.941°
Mean motion	0.40267° / day
Inclination	1.0472°
Longitude of ascending node	85.287°
Argument of perihelion	131.622°
Earth MOID	0.000488451 AU (73,071.2 km)
Jupiter MOID	2.24448 AU (335.769 Gm)
Physical characteristics
Dimensions	~73 meters (240 ft); (assumed)
Mass	5.4×108 kg
Absolute magnitude (H)	23.6

2002 MN is the provisional designation given to a 73-meter Apollo near-Earth asteroid that on 14 June 2002 passed Earth at a distance of 0.0008 AU (120,000 km; 74,000 mi),^[3] about one third the distance to the Moon (0.3 LD).^[5] The close approach was second only to the Earth approach by the 10-meter asteroid 1994 XM1.^[5] 2002 MN was discovered on 17 June 2002, three days after closest approach.^[1] Its mass and relative velocity were in the same general range as the object ascribed to the Tunguska event of 1908, which leveled over 2,100 km² (800 sq mi) of trees in Siberia.

2002 MN was estimated to have a 1 in 360,000 chance of Earth impact sometime after 2070,^[4] but further observations in July 2024^[6] ruled this out, and the object was removed from the risk list.

History of closest approaches of large near-Earth objects since 1914
(less than H 24 and 1 LD)^(A)

NEO	Date	Approach distance in lunar distances			Abs. mag (H)	Diameter ^(C) (m)	Ref ^(D)
NEO	Date	Nominal^(B)	Minimum	Maximum	Abs. mag (H)	Diameter ^(C) (m)	Ref ^(D)
(152680) 1998 KJ9	1914-12-31	0.606	0.604	0.608	19.4	279–900	data
(458732) 2011 MD5	1918-09-17	0.911	0.909	0.913	17.9	556–1795	data
(163132) 2002 CU11	1925-08-30	0.903	0.901	0.905	18.5	443–477	data
2010 VB1	1936-01-06	0.553	0.553	0.553	23.2	48–156	data
2002 JE9	1971-04-11	0.616	0.587	0.651	21.2	122–393	data
2013 UG1	1976-10-17	0.854	0.853	0.855	22.3	73–237	data
2012 TY52	1982-11-04	0.818	0.813	0.822	21.4	111–358	data
2012 UE34	1991-04-08	0.847	0.676	1.027	23.3	46–149	data
2017 VW13	2001-11-08	0.373	0.316	3.236	20.7	153–494	data
2002 MN	2002-06-14	0.312	0.312	0.312	23.6	40–130	data
(308635) 2005 YU55	2011-11-08	0.845	0.845	0.845	21.9	320–400	data
2011 XC2	2011-12-03	0.904	0.901	0.907	23.2	48–156	data
2018 AH	2018-01-02	0.773	0.772	0.773	22.5	67–216	data
2018 GE3	2018-04-15	0.502	0.501	0.503	23.7	35–135	data
2010 WC9	2018-05-15	0.528	0.528	0.528	23.5	42–136	data
(153814) 2001 WN5	2028-06-26	0.647	0.647	0.647	18.2	921–943	data
99942 Apophis	2029-04-13	0.0989	0.0989	0.0989	19.7	310–340	data
2012 UE₃₄	2041-04-08	0.283	0.274	0.354	23.3	46–149	data
2015 XJ351	2047-06-06	0.789	0.251	38.135	22.4	70–226	data
2007 TV18	2058-09-22	0.918	0.917	0.919	23.8	37–119	data
2005 WY55	2065-05-28	0.865	0.856	0.874	20.7	153–494	data
(308635) 2005 YU55	2075-11-08	0.592	0.499	0.752	21.9	320–400	data
(456938) 2007 YV56	2101-01-02	0.621	0.615	0.628	21.0	133–431	data
2007 UW1	2129-10-19	0.239	0.155	0.381	22.7	61–197	data
101955 Bennu	2135-09-25	0.531	0.507	0.555	20.19	472–512	data
(153201) 2000 WO107	2140-12-01	0.634	0.631	0.637	19.3	427–593	data
2009 DO111	2146-03-23	0.896	0.744	1.288	22.8	58–188	data
(85640) 1998 OX4	2148-01-22	0.771	0.770	0.771	21.1	127–411	data
2011 LT17	2156-12-16	0.998	0.955	1.215	21.6	101–327	data
^(A) This list includes near-Earth approaches of less than 1 lunar distances (LD) of objects with H brighter than 24. ^(B) Nominal geocentric distance from the center of Earth to the center of the object (Earth has a radius of approximately 6,400 km). ^(C) Diameter: estimated, theoretical mean-diameter based on H and albedo range between 0.05 and 0.25. ^(D) Reference: data source from the JPL SBDB, with AU converted into LD (1 AU≈390 LD) ^(E) Color codes: unobserved at close approach observed during close approach upcoming approaches Note: All close approaches between 1900 and 2200 are listed (with H<24 at less than 1 LD). Objects not observed during the approach, and simply estimated to have approached on this date, are colored grey. Generically estimated asteroid diameters are given in italics.