(101869) 1999 MM

(101869) 1999 MM
Discovery [1]
Discovered by LONEOS
Discovery site Anderson Mesa Station
Discovery date 20 June 1999
Designations
MPC designation (101869) 1999 MM
1999 MM
Apollo · NEO · PHA
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 3167 days (8.67 yr)
Aphelion 2.6163 AU (391.39 Gm)
Perihelion 0.63186 AU (94.525 Gm)
1.6241 AU (242.96 Gm)
Eccentricity 0.61095
2.07 yr (755.99 d)
329.21°
0° 28m 34.32s / day
Inclination 4.7650°
111.08°
268.61°
Earth MOID 0.00201025 AU (300,729 km)
Jupiter MOID 2.84917 AU (426.230 Gm)
Physical characteristics
Dimensions 350–900 m[2]
19.3[1]

    (101869) 1999 MM is an unnamed, eccentric asteroid from the group of Apollo asteroids, classified as a near-Earth object and potentially hazardous asteroid, about half a kilometer in diameter. It has a notably low Earth minimum orbit intersection distance of only 0.00201 AU (301,000 km), which is less than one lunar distance,[1] and also approaches Mars and Venus to within 15 million kilometers. It was discovered by the Lowell Observatory Near-Earth-Object Search (LONEOS) at its U.S. Anderson Mesa Station in Flagstaff, Arizona, on 20 June 1999.[3]

    The asteroid orbits the Sun at a distance of 0.6–2.6 AU once every 2 years and 1 month (756 days). Its orbit has an eccentricity of 0.61 and an inclination of 5° with respect to the ecliptic.[1] Its orbit is very similar to that of 69230 Hermes, which in 1937 made what was for decades the closest observed approach to Earth by an asteroid. 1999 MM's nearest pass to Earth within at least a century of present was the 930,000 kilometers one in 1875. In 2090 it passes Venus at 788,000 km.

    Based on its absolute magnitude of 19.3,[1] its diameter is between 350 and 900 meters, assuming an albedo in the range of 0.05 to 0.25.[2]

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 101869 (1999 MM)" (2008-02-12 last obs.). Jet Propulsion Laboratory. Retrieved 7 April 2016.
    2. 1 2 "Absolute Magnitude (H)". NASA/JPL. Retrieved February 2016.
    3. ↑ "101869 (1999 MM)". Minor Planet Center. Retrieved February 2016.

    External links

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