(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
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)
0° 25m 19.92s / day
Inclination 7.1230°
Earth MOID 0.0247 AU
Physical characteristics
Dimensions 2.22 km[2][3]
1.43±0.07 km[4]
34.49±0.18 h[a]
34.29±0.06 h[5][6]
SMASS = Q[1][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 0.0247 AU (3,700,000 km). 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.).[a] 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]


  1. ^ a b 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)
  1. ^ a b c d e f "JPL Small-Body Database Browser: 86039 (1999 NC43)" (2014-06-24 last obs.). Jet Propulsion Laboratory. Retrieved 7 April 2016. 
  2. ^ a b c d Delbó, Marco; Harris, Alan W.; Binzel, Richard P.; Pravec, Petr; Davies, John K. (November 2003). "Keck observations of near-Earth asteroids in the thermal infrared". Icarus 166 (1): 116–130. Bibcode:2003Icar..166..116D. doi:10.1016/j.icarus.2003.07.002. Retrieved March 2016. 
  3. ^ a b c Delbo, Marco; Walsh, Kevin; Mueller, Michael; Harris, Alan W.; Howell, Ellen S. (March 2011). "The cool surfaces of binary near-Earth asteroids". Icarus 212 (1): 138–148. Bibcode:2011Icar..212..138D. doi:10.1016/j.icarus.2010.12.011. Retrieved March 2016. 
  4. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved March 2016. 
  5. ^ a b Warner, Brian D. (July 2014). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January-March". The Minor Planet Bulletin 41 (3): 157–168. Bibcode:2014MPBu...41..157W. ISSN 1052-8091. Retrieved March 2016. 
  6. ^ a b Warner, Brian D. (October 2014). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 March-June". The Minor Planet Bulletin 41 (4): 213–224. Bibcode:2014MPBu...41..213W. ISSN 1052-8091. Retrieved March 2016. 
  7. ^ a b c "LCDB Data for (86039)". Asteroid Lightcurve Database (LCDB). Retrieved March 2016. 
  8. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved May 2016. 
  9. ^ a b "86039 (1999 NC43)". Minor Planet Center. Retrieved March 2016. 
  10. ^ "MPEC 1999-O15 : 1999 NC43". IAU Minor Planet Center. 1999-07-19. Retrieved 2013-11-09.  (J99N43C)
  11. ^ "JPL Small-Body Database Search Engine: spec. type = Q (SMASSII)". JPL Solar System Dynamics. Retrieved March 2016. 
  12. ^ "JPL Close-Approach Data: 86039 (1999 NC43)". Retrieved 2013-11-09. 
  13. ^ Borovička, Jiří; Spurný, Pavel; Brown, Peter; Wiegert, Paul; Kalenda, Pavel; Clark, David; et al. (November 2013). "The trajectory, structure and origin of the Chelyabinsk asteroidal impactor". Nature 503 (7475): 235–237. Bibcode:2013Natur.503..235B. doi:10.1038/nature12671. Retrieved March 2016. 
  14. ^ Schiermeier, Quirin. "Risk of massive asteroid strike underestimated". Nature News. Nature Publishing Group. Retrieved 7 November 2013. 

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