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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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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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .19099307129552 3.9211e-08  
a 2.554488238196162 1.3598e-08 au
q 2.066598683994795 9.9311e-08 au
i 8.082830809137823 5.1576e-06 deg
node 166.0696237631797 3.421e-05 deg
peri 237.3051725861323 3.8017e-05 deg
M 344.3766397677496 2.1086e-05 deg
tp 2459065.218170777610
(2020-Aug-03.71817078)
8.7599e-05 TDB
period 1491.263155530758
4.08
1.1908e-05
3.26e-08
d
yr
n .2414060849453976 1.9276e-09 deg/d
Q 3.042377792397529 1.6195e-08 au
  Orbit Determination Parameters
   # obs. used (total)      981  
   data-arc span      9778 days (26.77 yr)  
   first obs. used      1991-10-03  
   last obs. used      2018-07-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54261  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 18:06:32  

Additional Information
 Earth MOID = 1.08746 au 
 Jupiter MOID = 2.4075 au 
 T_jup = 3.399 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455866.5 (2011-Nov-01.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1927898500519996 3.9491e-08  
q 2.061452434492088 1.0023e-07 au
tp 2456079.631137921711
(2012-Jun-01.13113792)
7.655e-05 TDB
node 166.3289569055067 3.4142e-05 deg
peri 236.618882733114 3.7844e-05 deg
i 8.092145208870402 5.1626e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      981  
   data-arc span      9778 days (26.77 yr)  
   first obs. used      1991-10-03  
   last obs. used      2018-07-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54261  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 18:06:32  

Additional Information
 Jupiter MOID = 2.4075 au 
 T_jup = 3.399 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.559503870146189E-15 -3.934496137872426E-15 -9.248553296599561E-14 -9.562708215482366E-15 3.105967065954857E-15 2.315673446201647E-15
q -3.934496137872426E-15 1.004513278093989E-14 4.623793605037457E-13 2.521875439870102E-14 3.479086796312033E-14 -5.405368554653576E-15
tp -9.248553296599561E-14 4.623793605037457E-13 5.85993517731778E-9 2.271835477650188E-11 1.276039652839414E-9 8.65482681322562E-13
node -9.562708215482366E-15 2.521875439870102E-14 2.271835477650188E-11 1.165650657961739E-9 -1.148263469144819E-9 -2.217496949318017E-11
peri 3.105967065954857E-15 3.479086796312033E-14 1.276039652839414E-9 -1.148263469144819E-9 1.432189212894476E-9 2.22442208709297E-11
i 2.315673446201647E-15 -5.405368554653576E-15 8.65482681322562E-13 -2.217496949318017E-11 2.22442208709297E-11 2.66525880579806E-11

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

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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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