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21878 (1999 UF13)
Classification: Main-belt Asteroid          SPK-ID: 2021878
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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04421072215460638 3.2201e-08  
a 2.996151874647 1.5691e-08 au
q 2.863689836583978 1.0215e-07 au
i 10.02135183052952 3.8228e-06 deg
node 209.2843009174724 1.8418e-05 deg
peri 286.6270532569627 4.7293e-05 deg
M 305.6535650544134 4.4832e-05 deg
tp 2459682.464894817461
(2022-Apr-12.96489482)
0.00023642 TDB
period 1894.279951157056
5.19
1.4881e-05
4.074e-08
d
yr
n .1900458270595675 1.4929e-09 deg/d
Q 3.128613912710021 1.6385e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2472  
   data-arc span      15051 days (41.21 yr)  
   first obs. used      1979-12-18  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46718  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:03:23  

Additional Information
 Earth MOID = 1.89619 au 
 Jupiter MOID = 1.90882 au 
 T_jup = 3.230 
[ show covariance matrix ]

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 12.87   n/a MPCxxxxx  

21878 (1999 UF13)          Discovered 1999-Oct-29 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 UF13 = 1979 YT4 = 1998 MH45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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