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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8994778405070804 4.2246e-06  
a 23.77611101845525 0.0010117 AU
q 2.390026023918523 1.5179e-06 AU
i 160.4035836112461 2.3147e-05 deg
node 297.2209756260182 7.8611e-05 deg
peri 102.4474621897695 0.00013984 deg
M 46.84393716575179 0.00299 deg
tp 2451490.386486866302
(1999-Nov-07.88648687)
0.00036656 JED
period 42345.73318867819
115.94
2.7028
0.0074
d
yr
n .008501446849342823 5.4263e-07 deg/d
Q 45.16219601299198 0.0019217 AU
  Orbit Determination Parameters
   # obs. used (total)      277  
   data-arc span      927 days (2.54 yr)  
   first obs. used      1998-06-16  
   last obs. used      2000-12-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      2  
   fit RMS      .5327  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:43:05  

Additional Information
 Earth MOID = 1.48223 AU 
 T_jup = -1.541 
[ 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 mag 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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