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JPL Small-Body Database Browser
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4976 Choukyongchol (1991 PM)
Classification: Main-belt Asteroid          SPK-ID: 2004976
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1009495978613215 3.8061e-08  
a 3.022795681809506 1.6773e-08 au
q 2.717645673313897 1.1385e-07 au
i 8.622939871186416 3.8117e-06 deg
node 260.7334090760457 2.5642e-05 deg
peri 65.55040355912304 3.1228e-05 deg
M 176.511693285363 1.9784e-05 deg
tp 2458059.298529599822
0.00010269 TDB
period 1919.603868941873
n .1875386926566468 1.5609e-09 deg/d
Q 3.327945690305115 1.8466e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2656  
   data-arc span      25341 days (69.38 yr)  
   first obs. used      1950-12-11  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41065  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:15:01  

Additional Information
 Earth MOID = 1.71973 au 
 Jupiter MOID = 1.96858 au 
 T_jup = 3.221 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.6   n/a MPO365307  
diameter diameter 16.930 km 0.183 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.416 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Behrend, R. (2017) Observatoire de Geneve web site,]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.186   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4976 Choukyongchol           Discovered 1991 Aug. 9 by K. Watanabe at JCPM Sapporo Station.
Kyong Chol Chou (b. 1929) is one of the leading astronomers in Korea. After working at NASA and the U.S. Naval Observatory, he now teaches at Kyunghee University and is active in astronomical research and popularization. The name was suggested by K. Hurukawa.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20011130/MPCPages.arcLast Updated: 2009-05-11

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Alternate Designations
 1991 PM = 1949 QD2 = 1971 UL3 = 1975 PT = 1976 UN3 = 1980 NH = 1986 RJ10 = 1987 YZ = 1988 AS3 = 1990 MM1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-May-28 19:10 UT
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