Key Facts

  • Categorized as a Aten-class Asteroid
  • Comparable in size to a school bus or smaller
  • Will pass within 15,606,014 km of Earth in 2020
  • Classified as a Near Earth Asteroid (NEA)
  • Classified as a Potentially Hazardous Asteroid (PHA)
  • See orbit simulation

Overview

437844 (1999 MN) is a very small asteroid whose orbit could bring it in close proximity to Earth. NASA JPL has classified 1999 MN as a "Potentially Hazardous Asteroid" due to its predicted close pass(es) with Earth.

1999 MN orbits the sun every 202 days (0.55 years), coming as close as 0.23 AU and reaching as far as 1.12 AU from the sun. Based on its brightness and the way it reflects light, 1999 MN is probably between 0.139 to 0.312 kilometers in diameter, making it a small to average asteroid, very roughly comparable in size to a school bus or smaller.

The rotation of 1999 MN has been observed. It completes a rotation on its axis every 5.50 days.

Close Approaches

1999 MN's orbit is 0.01 AU from Earth's orbit at its closest point. This means that its orbit is relatively close to Earth's orbit.

1999 MN has 56 close approaches predicted in the coming decades:

Date Distance from Earth (km) Velocity (km/s)
June 25, 2020 15,606,014 13.093
July 5, 2025 10,681,932 13.584
June 3, 2026 24,168,967 20.579
July 11, 2030 2,519,386 15.341
June 2, 2031 8,938,598 17.132
July 12, 2035 14,999,770 18.457
June 3, 2036 4,749,241 14.428
June 14, 2041 14,286,107 13.167
June 27, 2046 15,172,621 13.121
July 9, 2051 5,930,249 14.313
June 1, 2052 15,528,750 18.599
July 12, 2056 11,440,892 17.656
June 3, 2057 2,385,448 14.861
June 16, 2062 14,713,911 13.136
July 3, 2067 12,567,742 13.355
June 3, 2068 26,992,081 21.245
July 11, 2072 3,898,977 15.914
June 2, 2073 4,681,467 16.210
July 10, 2077 25,727,073 20.956
June 10, 2078 11,925,677 13.408
June 28, 2083 14,935,017 13.117
July 10, 2088 3,559,855 14.807
June 1, 2089 11,321,903 17.639
July 12, 2093 16,808,970 18.878
June 5, 2094 6,597,518 14.102
June 21, 2099 15,607,867 13.079
July 7, 2104 9,506,121 13.719
June 3, 2105 20,798,142 19.783
July 13, 2109 9,012,993 17.090
June 4, 2110 1,015,266 15.139
June 21, 2115 15,377,778 13.101
July 9, 2120 6,735,646 14.162
June 3, 2121 15,144,291 18.495
July 13, 2125 18,406,417 19.230
June 8, 2126 8,411,108 13.825
June 30, 2131 14,398,700 13.170
July 13, 2136 7,133,607 16.636
June 4, 2137 825,802 15.210
June 25, 2142 15,339,861 13.104
July 13, 2147 5,465,966 16.216
June 3, 2148 1,262,194 15.453
June 23, 2153 15,448,205 13.087
July 13, 2158 2,963,446 15.343
June 3, 2159 5,720,708 16.389
June 19, 2164 15,062,036 13.107
July 12, 2169 3,785,874 14.801
June 3, 2170 9,205,772 17.144
June 16, 2175 13,961,109 13.188
July 9, 2180 7,301,286 14.060
June 3, 2181 15,006,736 18.438
July 12, 2185 23,871,652 20.474
June 12, 2186 11,722,315 13.398
July 7, 2191 10,492,025 13.571
June 4, 2192 20,658,203 19.731
July 13, 2196 18,733,330 19.274
June 9, 2197 9,083,936 13.716

Images and Observations

1999 MN's orbit is determined by observations dating back to June 22, 1999. It was last officially observed on June 15, 2015. The IAU Minor Planet Center records 136 observations used to determine its orbit.

Accessibility and Exploration

This asteroid is not considered a viable target for human exploration by the NHATS study.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of 1999 MN:

References

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Orbital Elements

  • Epoch: 2455948.5 JD
  • Semi-major axis: 0.6738 AU
  • Eccentricity: 0.6654
  • Inclination: 2.02°
  • Longitude of Ascending Node: 80.81°
  • Argument of Periapsis: 9.83°
  • Mean Anomaly: 106.44°

Physical Characteristics

  • Diameter: ~0.180 km
  • Magnitude: 21.4

Derived Characteristics

  • Orbit Period: 202 days (0.55 years)
  • Avg. Orbit Speed: 36.29 km/s
  • Aphelion Distance: 1.12 AU
  • Perihelion Distance: 0.23 AU
  • Rotation Period: 5.50 hours

Map Comparison

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Orbit Simulation

Sky Map

The position of 437844 (1999 MN) is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of 1999 MN to create an approximate landscape rendering. The approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.