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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 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

[ 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
2001-Jul-01 04:29 00:02 Jupiter 1.30488310179944 1.30485086479887 1.30491533968105 25.7939772820707 25.7687995247112 2452091.686644772 1.82605246934764 2357.35071552371 310.859269719269 -47.5450710239679 451302.013038968 T 7 CATAB v2.0f-lin.ifort 2021-Apr-13 03:21:47 2021-Apr-13 03:21
2002-Jun-01 07:41 00:05 Saturn 1.95573730388586 1.95569321337863 1.95578139718403 21.1360034032838 21.1298670794984 2452426.819963324 5.15043874355053 4336.53180635431 369.478933606847 59.8925992482973 620393.853105627 T 7 CATAB v2.0f-lin.ifort 2021-Apr-13 03:21:47 2021-Apr-13 03:21
2114-Dec-17 16:08 4_02:06 Jupiter 1.0797457547568 1.05997922021452 1.0995245598615 30.3066461688499 30.2807508568201 2493533.172516686 5886.10153839439 1002564.74481288 342.82282734498 -10.4850380617256 79783.385905044 T 7 CATAB v2.0f-lin.ifort 2021-Apr-13 03:21:47 2021-Apr-13 03:21
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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