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21877 (1999 UL12)
Classification: Main-belt Asteroid          SPK-ID: 2021877
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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1750063485829374 3.4501e-08  
a 2.36770237480466 8.8353e-09 au
q 1.953339427658947 8.3224e-08 au
i 2.580063681794718 3.3803e-06 deg
node 149.662913438014 9.2135e-05 deg
peri 102.3071038637465 9.3097e-05 deg
M 41.86691269297696 1.1042e-05 deg
tp 2459045.740425319832
(2020-Jul-15.24042532)
4.1077e-05 TDB
period 1330.72737637534
3.64
7.4486e-06
2.039e-08
d
yr
n .2705287396886465 1.5143e-09 deg/d
Q 2.782065321950373 1.0382e-08 au
  Orbit Determination Parameters
   # obs. used (total)      813  
   data-arc span      9629 days (26.36 yr)  
   first obs. used      1994-03-05  
   last obs. used      2020-07-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53924  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:32  

Additional Information
 Earth MOID = .93938 au 
 Jupiter MOID = 2.25784 au 
 T_jup = 3.525 
[ 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 16.24   n/a E2021B10  

21877 (1999 UL12)          Discovered 1999-Oct-31 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 UL12 = 1994 EM7 = 1998 FB134 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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