4183 Cuno

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4183 Cuno
Cuno, imaged by radar
Radar images of 4183 Cuno
Discovery [1]
Discovered by C. Hoffmeister
Discovery site Boyden Observatory
Discovery date 5 June 1959
MPC designation 4183 Cuno
Named after
Cuno Hoffmeister
1959 LM · 1986 VT7
1987 MB
Apollo · NEO · PHA
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 56.39 yr (20,596 days)
Aphelion 3.2401 AU
Perihelion 0.7248 AU
1.9825 AU
Eccentricity 0.6344
2.79 yr (1,020 days)
0° 21m 11.16s / day
Inclination 6.7054°
Earth MOID 0.0290 AU
Physical characteristics
Dimensions 3.92 km (calculated)[3]
5.38 km[4]
5.49 km[5]
5.618±0.457 km[6]
3.558±0.002 h[7]
3.5590±0.001 h[a]
3.5595 h [b]
0.20 (assumed)[3]
SMASS = Sq [1]
Q[c][9][10] · S[3]

4183 Cuno, provisional designation 1959 LM, is an eccentric, rare-type asteroid, classified as near-Earth object and potentially hazardous asteroid. It belongs to the group of Apollo asteroids and measures approximately 5 kilometers in diameter. It was discovered by German astronomer Cuno Hoffmeister at Boyden Observatory in Bloemfontein, South Africa, on 5 June 1959.[11]

The asteroid orbits the Sun at a distance of 0.7–3.2 AU once every 2 years and 9 months (1,020 days). Its orbit has a high eccentricity of 0.63 and an inclination of 7° with respect to the plane of the ecliptic.[1] As an anomaly, the asteroid's observation arc begins with the first used observation made at Palomar Observatory in 1986, or 27 years after its discovery.[11] It is also a Mars- and Venus-crosser. The asteroid has an Earth minimum orbital intersection distance of 0.0287 AU (4,290,000 km) and approaches the Earth to within 40 million kilometers six times in the 21st century. On 20 May 2012, it made its closest Earth approach at a distance of 0.122 AU (18,000,000 km).[12] It will not make a closer approach until 2093 when it will pass Earth at 0.084 AU (13,000,000 km).[12]

The stony S-type asteroid, with its reflective surface composed of a mixture different silicates, nickel and iron, is also classified as a rather rare Q-type asteroid by the NASA IRTF telescope, the 1-meter JKT on La Palma, and Pan-STARRS' large-scale magnitude survey.[c][9][10] On the SMASS taxonomic scheme, it is a Sq-subtype, a transitional group between the S and Q types.[1]

Several photometric light-curve analysis gave a rotation period of 3.56 hours with a high brightness amplitude between 0.47 and 0.83 in magnitude, indicating that the body has a non-spheroidal shape.[b][a][7] In December 2000, Cuno was analysed by radar to determine its shape. The resultant images are lacking in detail, but indicate a rough sphere with some kind of concave depression 1–2 km in diameter.[citation needed]

Following the space-based surveys carried out by NASA's Spitzer Space Telescope and the NEOWISE mission of the Wide-field Infrared Survey Explorer, the asteroid has an albedo of 0.10 to 0.11, with a diameter between 5.4 and 5.6 kilometers,[4][5][6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for the stony asteroid of 0.20 and calculates a diameter of 3.9 kilometer, as the higher the body's albedo (reflectivity), the lower its diameter, for a given absolute magnitude (brightness).[3]

The minor planet was named after its discoverer, Cuno Hoffmeister, according to the established practice to name near-Earth asteroids with a four-letter masculine name. The outer main-belt asteroid 1726 Hoffmeister is also named after the discoverer.[2] Naming citation was published on 28 May 1991 (M.P.C. 18307).[13]


  1. ^ a b Pravec (2000) web: rotation period of 3.5590±0.001 hours with a brightness amplitude of 0.83 mag. (LCDB quality code = 3). Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (4183) Cuno
  2. ^ a b Pravec (1998) web: rotation period 3.5595 hours with a brightness amplitude of 0.7 in magnitude. Call assigns a quality code of 3, which denotes a secure result within the precision given and no ambiguity. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (4183) Cuno
  3. ^ a b . Dandy-2003 Optical colors of 56 near-Earth objects: trends with size and orbit. Summary figures at LCDB for (4183) Cuno
  1. ^ a b c d e f "JPL Small-Body Database Browser: 4183 Cuno (1959 LM)" (2015-10-25 last obs.). Jet Propulsion Laboratory. Retrieved 29 May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4183) Cuno. Springer Berlin Heidelberg. p. 358. ISBN 978-3-540-00238-3. Retrieved 1 February 2016. 
  3. ^ a b c d e "LCDB Data for (4183) Cuno". Asteroid Lightcurve Database (LCDB). Retrieved 29 May 2016. 
  4. ^ a b c Harris, A. W.; Mommert, M.; Hora, J. L.; Mueller, M.; Trilling, D. E.; Bhattacharya, B.; et al. (March 2011). "ExploreNEOs. II. The Accuracy of the Warm Spitzer Near-Earth Object Survey". The Astronomical Journal. 141 (3): 10. Bibcode:2011AJ....141...75H. doi:10.1088/0004-6256/141/3/75. Retrieved 1 February 2016. 
  5. ^ a b c d Trilling, D. E.; Mueller, M.; Hora, J. L.; Harris, A. W.; Bhattacharya, B.; Bottke, W. F.; et al. (September 2010). "ExploreNEOs. I. Description and First Results from the Warm Spitzer Near-Earth Object Survey". The Astronomical Journal. 140 (3): 770–784. Bibcode:2010AJ....140..770T. doi:10.1088/0004-6256/140/3/770. Retrieved 1 February 2016. 
  6. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407free to read. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 29 May 2016. 
  7. ^ a b Warner, Brian D. (April 2015). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 October-December". The Minor Planet Bulletin. 42 (2): 115–127. Bibcode:2015MPBu...42..115W. ISSN 1052-8091. Retrieved 1 February 2016. 
  8. ^ Thomas, C. A.; Trilling, D. E.; Emery, J. P.; Mueller, M.; Hora, J. L.; Benner, L. A. M.; et al. (September 2011). "ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population". The Astronomical Journal. 142 (3): 12. Bibcode:2011AJ....142...85T. doi:10.1088/0004-6256/142/3/85. Retrieved 1 February 2016. 
  9. ^ a b Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus. 228: 217–246. arXiv:1310.2000free to read. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. Retrieved 29 May 2016. 
  10. ^ a b c 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:1506.00762free to read. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 29 May 2016. 
  11. ^ a b "4183 Cuno (1959 LM)". Minor Planet Center. Retrieved 1 February 2016. 
  12. ^ a b "JPL Close-Approach Data: 4183 Cuno (1959 LM))". Retrieved 19 June 2012. 
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 May 2016. 

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