2201 Oljato

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2201 Oljato
Discovery [1]
Discovered by H. L. Giclas
Discovery site Lowell Observatory
Discovery date 12 December 1947
MPC designation 2201 Oljato
Named after
Oljato–Monument Valley
(Navajo Reservation)[2]
1947 XC · 1979 VU2
1979 XA
Amor · NEO · PHA
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 83.71 yr (30,574 days)   
Aphelion 3.7252 AU
Perihelion 0.6237 AU
2.1745 AU
Eccentricity 0.7131
3.21 yr (1,171 days)
Inclination 2.5225°
Earth MOID 0.0031 AU
Physical characteristics
Dimensions 1.80±0.1 km (IRAS)[3]
2.15 km[4]
26 h[a]
24 h[5]

2201 Oljato, provisional designation 1947 XC, is stony and extremely eccentric asteroid, classified as near-Earth object. It measures about 2 kilometers in diameter and is a sizable member of the Apollo asteroids, a subgroup of near-Earth asteroids which cross the orbit of Earth. It was discovered by American astronomer Henry L. Giclas at the U.S Lowell Observatory in Flagstaff, Arizona, on 12 December 1947.[7] After its discovery, the body became a lost asteroid for 32 years and was recovered under the provisional designation 1979 XA, by the American astronomers Passey and Bus at the Californian Palomar Observatory in 1979.[2]

Due to its size and its Earth minimum orbit intersection distance (MOID) of 0.0031 AU (460,000 km), which is only about 1.2 lunar distances, the near-Earth Apollo asteroid is also a potentially hazardous object. It orbits the Sun at a distance of 0.6–3.7 AU once every 3 years and 3 months (1,171 days). Its orbit shows an outstanding eccentricity of 0.71 and is tilted by 3 degrees to the plane of the ecliptic. It has a rotation period of 26 hours.[a] The stony asteroid is classified as a Sq-subtype in the SMASS taxonomic scheme, with a geometric albedo of 0.24.[4] An alternative and exceptionally high albedo of 0.43 was determined by 11 observations from the Infrared Astronomical Satellite, IRAS.[3]

It was a target of Hubble search for transition comets, a spectroscopic study involving amateur astronomers and the use of the Hubble Space Telescope. The asteroid belongs to the Taurid Complex (also see Taurids), a group of near-Earth asteroids thought to be extinct cometary nuclei, that are associated with four meteor showers on Earth, due to their disintegration. The Taurid Complex includes several other Apollo asteroids such as 4183 Cuno, 4341 Poseidon, 5143 Heracles, and 5731 Zeus.[8]

The minor planet was named after the Oljato–Monument Valley in Utah, on the Navajo Indian Reservation.[2]


  1. ^ a b Pravec (1995) web: rotation period 26 hours with a brightness amplitude of 0.1 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2201) Oljato
  1. ^ a b c "JPL Small-Body Database Browser: 2201 Oljato (1947 XC)" (2015-08-18 last obs.). Jet Propulsion Laboratory. Retrieved December 2015. 
  2. ^ a b c Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (2201) Oljato. Springer Berlin Heidelberg. p. 179. ISBN 978-3-540-29925-7. Retrieved December 2015. 
  3. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved December 2015. 
  4. ^ a b c Harris, Alan W. (February 1998). "A Thermal Model for Near-Earth Asteroids". Icarus 131 (2): 291–301. Bibcode:1998Icar..131..291H. doi:10.1006/icar.1997.5865. Retrieved December 2015. 
  5. ^ Harris, A. W.; Young, J. W. (April 1983). "Asteroid rotation. IV". Icarus: 59–109. Bibcode:1983Icar...54...59H. doi:10.1016/0019-1035(83)90072-6. ISSN 0019-1035. Retrieved December 2015. 
  6. ^ "LCDB Data for (2201) Oljato". Asteroid Lightcurve Database (LCDB). Retrieved December 2015. 
  7. ^ "2201 Oljato (1947 XC)". Minor Planet Center. Retrieved December 2015. 
  8. ^ Babadzhanov, P. B. (2001). "Search for meteor showers associated with Near-Earth Asteroids". Astronomy and Astrophysics 373 (1): 329–335. Bibcode:2001A&A...373..329B. doi:10.1051/0004-6361:20010583. 

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