Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9009153528865 3.2532e-06  
a 23.87921549255496 0.00079595 au
q 2.366063640427029 1.4414e-06 au
i 160.4303392253267 2.2474e-05 deg
node 297.8361061011213 7.8821e-05 deg
peri 103.0372927472188 0.00012657 deg
M 66.59318469253112 0.0033276 deg
tp 2451512.333397058108
(1999-Nov-29.83339706)
0.00036635 TDB
period 42621.47831138966
116.69
2.131
0.005834
d
yr
n .008446445648127552 4.2231e-07 deg/d
Q 45.39236734468289 0.001513 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 = 1.45775 au 
 Jupiter MOID = .167823 au 
 T_jup = -1.534 
[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jul-27 07:08 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin