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21672 Laichunju (1999 RK14)
Classification: Main-belt Asteroid          SPK-ID: 2021672
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .190993131365268 3.7907e-08  
a 2.554488244529883 1.174e-08 au
q 2.066598535671354 9.5663e-08 au
i 8.082833112158182 4.8928e-06 deg
node 166.0696242506448 3.3525e-05 deg
peri 237.3051925495467 3.6718e-05 deg
M 344.3766202040451 1.7821e-05 deg
tp 2459065.218252058952
(2020-Aug-03.71825206)
7.3975e-05 TDB
period 1491.263161077023
4.08
1.028e-05
2.815e-08
d
yr
n .2414060840475668 1.6641e-09 deg/d
Q 3.042377953388412 1.3982e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1133  
   data-arc span      10633 days (29.11 yr)  
   first obs. used      1991-10-03  
   last obs. used      2020-11-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53616  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:17:35  

Additional Information
 Earth MOID = 1.08746 au 
 Jupiter MOID = 2.4075 au 
 T_jup = 3.399 
[ show covariance matrix ]

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 14.6   n/a MPO449112  
diameter diameter 3.792 km 0.827 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.162   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21672 Laichunju           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Lai Chun-Ju (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his mathematics project. He attends the Taipei Municipal Chien-Kuo Senior High School, Taipei City, Chinese Taipei.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 RK14 = 1991 TY5 = 1995 SW2 = 1997 ET18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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