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21881 (1999 UK15)
Classification: Main-belt Asteroid          SPK-ID: 2021881
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08695224814239662 4.3162e-08  
a 2.767688292930881 1.3446e-08 au
q 2.527031573703149 1.225e-07 au
i 2.471131674328258 3.3576e-06 deg
node 92.55984319519666 0.00011548 deg
peri 286.0838616981289 0.0001175 deg
M 224.8242171911133 2.3278e-05 deg
tp 2459831.995971577767
(2022-Sep-09.49597158)
0.00011065 TDB
period 1681.79939515801
4.60
1.2256e-05
3.356e-08
d
yr
n .2140564451601416 1.5599e-09 deg/d
Q 3.008345012158613 1.4615e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1412  
   data-arc span      10305 days (28.21 yr)  
   first obs. used      1992-03-06  
   last obs. used      2020-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52297  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:54:26  

Additional Information
 Earth MOID = 1.52892 au 
 Jupiter MOID = 2.41679 au 
 T_jup = 3.332 
[ 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 14.35   n/a E2021B10  
diameter diameter 3.802 km 0.502 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.212   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21881 (1999 UK15)          Discovered 1999-Oct-29 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 UK15 = 1992 EM11 = 1995 YT24 = 1997 EZ58 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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