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20461 Dioretsa (1999 LD31)
Classification: Centaur          SPK-ID: 2020461
Ephemeris | Orbit Diagram | Orbital Elements | 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 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9005636744648127 3.2626e-06  
a 23.89275004388222 0.00079672 au
q 2.375807271294334 1.5165e-06 au
i 160.4308914475279 2.2448e-05 deg
node 297.859541044166 7.8644e-05 deg
peri 103.1048298502124 0.00012598 deg
M 64.89789213707344 0.003244 deg
tp 2451510.510851675385
(1999-Nov-28.01085168)
0.0003838 TDB
period 42657.71972300149
116.79
2.1337
0.005842
d
yr
n .008439269664146726 4.2212e-07 deg/d
Q 45.40969281647011 0.0015142 au
  Orbit Determination Parameters
   # obs. used (total)      278  
   data-arc span      927 days (2.54 yr)  
   first obs. used      1998-06-16  
   last obs. used      2000-12-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      2  
   norm. resid. RMS      .48507  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:44  

Additional Information
 Earth MOID = 1.46601 au 
 Jupiter MOID = .175405 au 
 T_jup = -1.538 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.8   n/a PDS3 (MPO 7841)  

20461 Dioretsa           Discovered 1999 June 8 by the Lincoln Laboratory Near Earth Asteroid Research Team at Socorro.
As befits the first numbered asteroid in a retrograde orbit, Dioretsa is the word asteroid spelled backwards. The name was suggested independently by K. Kitterman and S. Cooksey of Flagstaff, Arizona.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030501/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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