(86039) 1999 NC43

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(86039) 1999 NC43
Discovery [1]
Discovered by LINEAR
Discovery site Lincoln Lab's ETS
Discovery date 14 July 1999
Designations
MPC designation (86039) 1999 NC43
1999 NC43
Apollo · NEO · PHA[1]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 15.04 yr (5,492 days)
Aphelion 2.7784 AU
Perihelion 0.7409 AU
1.7596 AU
Eccentricity 0.5790
2.33 yr (853 days)
30.803°
Inclination 7.1230°
311.81°
120.57°
Earth MOID 0.0247 AU
Physical characteristics
Dimensions 2.22 km[2][3]
1.43±0.07 km[4]
34.49±0.18 h[lower-alpha 1]
34.29±0.06 h[5][6]
0.14[3]
0.13[2]
0.352±0.039[4]
SMASS = Q[1][7]
16.0[1][4]
16.08[8]
16.1[2][7]

(86039) 1999 NC43, is an eccentric, rare-type asteroid, suspected tumbler and relatively slow rotator from the group of Apollo asteroids. It is classified as near-Earth object and potentially hazardous asteroid, and measures approximately 2.2 kilometers in diameter. The asteroid was discovered on 14 July 1999, by the U.S. Lincoln Near-Earth Asteroid Research (LINEAR) team at Lincoln Laboratory's Experimental Test Site, Socorro, New Mexico, at an apparent magnitude of 18, using a 1.0-meter reflector.[9][10]

The rare Q-type asteroid is one of only 20 characterized bodies of this spectral type in the SMASS taxonomic scheme.[11] It has a well-determined orbit with an uncertainty of 0. The body orbits the Sun at a distance of 0.7–2.8 AU once every 2 years and 4 months (853 days). Its orbit has a high eccentricity of 0.58 and an inclination of 7° with respect to the ecliptic.[1] The first observation was made by the Catalina Sky Survey in June 1999, extending the asteroid's observation arc by one month prior to its discovery.[9] Its Earth minimum orbit intersection distance is Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).. Its most notable close approach to Earth will be on 14 February 2173 at a distance of 0.03361 AU (5,028,000 km).[12] The asteroid also makes close approaches to Venus and Mars.

Several rotational light-curves were obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory and American astronomer Brian Warner at his private Palmer Divide Observatory, Colorado. The light-curve with the best result gave a rotation period of 34.49±0.18 hours with an exceptionally high brightness variation of 1.1 in magnitude (U=n.a.).[lower-alpha 1] Pravec's alternative period of 122 hours was later not supported by Warner.[5] However, there are still other periods possible due to sparse photometric data points. The asteroid is also suspected to be in a tumbling motion, which makes the determination of its period more complex.[6] For an asteroid of its size, it is a relatively slow rotator.

According to the survey carried out by the Japanese Akari satellite, the asteroid has a high albedo of 0.35 and a diameter of 1.43 kilometers.[4] Observations by the Keck Observatory in the thermal infrared gave a refined albedo of 0.13–0.14 with a larger diameter of 2.22 kilometers.[2][3][7]

1999 NC43 is suspected to be related to the 20-meter Chelyabinsk meteor, which exploded as a bright fireball over Russia on 15 February 2013. Analysis showed similar orbits for both bodies and suggested that they were once part of the same object.[13][14]

References

  1. 1.0 1.1 Pravec (2000) web: rotation period 34.49±0.18 hours with a brightness amplitude of 1.1 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (86039)
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External links