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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .191163990971609 3.7406e-08  
a 2.555043868184063 1.0584e-08 au
q 2.06661148523446 9.3646e-08 au
i 8.082649610751167 4.5968e-06 deg
node 166.06647711 3.3451e-05 deg
peri 237.3218085951472 3.6225e-05 deg
M 32.63779060559725 1.5229e-05 deg
tp 2459065.257179492508
(2020-Aug-03.75717949)
6.2967e-05 TDB
period 1491.749731807752
4.08
9.269e-06
2.538e-08
d
yr
n .2413273435375383 1.4995e-09 deg/d
Q 3.043476251133666 1.2607e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1269  
   data-arc span      10701 days (29.30 yr)  
   first obs. used      1991-10-03  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51407  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:53:55  

Additional Information
 Earth MOID = 1.08648 au 
 Jupiter MOID = 2.40745 au 
 T_jup = 3.398 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456180.5 (2012-Sep-10.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .193147687327643 3.7564e-08  
q 2.061464364882166 9.4281e-08 au
tp 2456079.267161766656
(2012-May-31.76716177)
6.092e-05 TDB
node 166.30632135416 3.3399e-05 deg
peri 236.5127006945652 3.6101e-05 deg
i 8.089969916587549 4.5994e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1269  
   data-arc span      10701 days (29.30 yr)  
   first obs. used      1991-10-03  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51407  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:53:55  

Additional Information
 Jupiter MOID = 2.40745 au 
 T_jup = 3.398 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.411025158294518E-15 -3.528236250987407E-15 2.236012302529454E-13 -7.086154852791992E-15 6.643381467088023E-14 5.191135258895652E-16
q -3.528236250987407E-15 8.888957421523766E-15 -6.206634568069246E-13 1.762347058620368E-14 -1.795785714432814E-13 -1.192947075458652E-15
tp 2.236012302529454E-13 -6.206634568069246E-13 3.711280734339346E-9 1.02412110061173E-11 8.620524368096544E-10 -1.800289409151416E-12
node -7.086154852791992E-15 1.762347058620368E-14 1.02412110061173E-11 1.115474567538151E-9 -1.101259844298919E-9 -2.45131584424201E-11
peri 6.643381467088023E-14 -1.795785714432814E-13 8.620524368096544E-10 -1.101259844298919E-9 1.303275694010239E-9 2.392429562060355E-11
i 5.191135258895652E-16 -1.192947075458652E-15 -1.800289409151416E-12 -2.45131584424201E-11 2.392429562060355E-11 2.115465854221225E-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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2094-Aug-31 07:57 00:05 Hebe 0.0395324182616258 0.0395283104220139 0.0395365309968353 3.13015941129659 3.13015936105797 2486120.831019784 4.73083770509665 728.753328245895 27.5675686701473 -73.8195874075465 205826.778348793 T 25 CATAB v2.0f-lin.ifort 2021-Feb-24 02:53:57 2021-Feb-24 02:53

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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