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21870 (1999 UD1)
Classification: Main-belt Asteroid          SPK-ID: 2021870
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1335720910966502 3.3613e-08  
a 2.29918421493745 6.1138e-09 au
q 1.992077371531845 7.675e-08 au
i 6.620025452671388 4.0427e-06 deg
node 44.10897879946791 2.3851e-05 deg
peri 207.2517674781746 2.6899e-05 deg
M 155.0259956720242 1.2748e-05 deg
tp 2458652.145882125685
(2019-Jun-17.64588213)		 4.4368e-05 TDB
period 1273.383096680071
3.49		 5.0791e-06
1.391e-08		 d
yr
n .2827114643963643 1.1276e-09 deg/d
Q 2.606291058343056 6.9304e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1794  
   data-arc span      10314 days (28.24 yr)  
   first obs. used      1992-10-23  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51199  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:49  

Additional Information
 Earth MOID = .979255 au 
 Jupiter MOID = 2.42233 au 
 T_jup = 3.572 
[ 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 14.8   n/a MPO492979  

21870 (1999 UD1)          Discovered 1999-Oct-16 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 UD1 = 1998 KE15 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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