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181920 (1999 TN79)
Classification: Main-belt Asteroid          SPK-ID: 2181920
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0970053816833862 4.6135e-08  
a 3.122086355233267 3.6211e-08 au
q 2.819227176695372 1.5214e-07 au
i 2.094155294880137 5.9429e-06 deg
node 55.75022968849473 0.00014483 deg
peri 257.1123098854317 0.00014834 deg
M 29.93693006857823 3.4941e-05 deg
tp 2459228.939921240908
(2021-Jan-14.43992124)
0.0001942 TDB
period 2014.957051878429
5.52
3.5055e-05
9.598e-08
d
yr
n .1786638577057474 3.1083e-09 deg/d
Q 3.424945533771163 3.9724e-08 au
  Orbit Determination Parameters
   # obs. used (total)      257  
   data-arc span      7149 days (19.57 yr)  
   first obs. used      1999-10-04  
   last obs. used      2019-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53271  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:36  

Additional Information
 Earth MOID = 1.80549 au 
 Jupiter MOID = 1.8095 au 
 T_jup = 3.208 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457009.5 (2014-Dec-18.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09616625671547754 4.6202e-08  
q 2.821003862938165 1.5147e-07 au
tp 2457226.406839710095
(2015-Jul-22.90683971)
0.00018399 TDB
node 55.87750977092584 0.00014445 deg
peri 259.1630288235303 0.00014801 deg
i 2.096963019117611 5.9497e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      257  
   data-arc span      7149 days (19.57 yr)  
   first obs. used      1999-10-04  
   last obs. used      2019-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53271  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:36  

Additional Information
 Jupiter MOID = 1.8095 au 
 T_jup = 3.208 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.134637612546068E-15 -6.851002904460856E-15 5.163556350856192E-13 1.23786083295723E-15 1.036747772480772E-13 -3.287638114746558E-16
q -6.851002904460856E-15 2.294305503717229E-14 -4.248573644029894E-14 -4.378184428597231E-15 -7.121837008065207E-14 1.341009928756465E-15
tp 5.163556350856192E-13 -4.248573644029894E-14 3.38539181076864E-8 -1.525516818982451E-11 5.967824386714091E-9 3.238524058760874E-13
node 1.23786083295723E-15 -4.378184428597231E-15 -1.525516818982451E-11 2.086639249254589E-8 -2.0854966929934E-8 -1.037289943219865E-10
peri 1.036747772480772E-13 -7.121837008065207E-14 5.967824386714091E-9 -2.0854966929934E-8 2.190661407244725E-8 1.037084385356554E-10
i -3.287638114746558E-16 1.341009928756465E-15 3.238524058760874E-13 -1.037289943219865E-10 1.037084385356554E-10 3.539885518571385E-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 15.8   n/a MPO469958  

181920 (1999 TN79)          Discovered 1999-Oct-11 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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