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66821 (1999 UC21)
Classification: Main-belt Asteroid          SPK-ID: 2066821
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1675302635378492 4.339e-08  
a 2.725782402406205 1.2526e-08 au
q 2.269131358184262 1.1968e-07 au
i 14.92189343740625 5.2272e-06 deg
node 195.8186426437201 1.4177e-05 deg
peri 218.0954601738653 1.8142e-05 deg
M 228.9043907505115 1.2307e-05 deg
tp 2459799.078133150562
(2022-Aug-07.57813315)
5.8202e-05 TDB
period 1643.747865911407
4.50
1.1331e-05
3.102e-08
d
yr
n .2190116911880468 1.5097e-09 deg/d
Q 3.182433446628149 1.4625e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1040  
   data-arc span      9909 days (27.13 yr)  
   first obs. used      1993-05-24  
   last obs. used      2020-07-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5348  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 12:25:08  

Additional Information
 Earth MOID = 1.29513 au 
 Jupiter MOID = 2.28941 au 
 T_jup = 3.288 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.89   n/a E2021B10  
diameter diameter 3.422 km 0.749 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.199   0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

66821 (1999 UC21)          Discovered 1999-Oct-31 by Spacewatch at Kitt Peak
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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