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15221 (1981 UA23)
Classification: Main-belt Asteroid          SPK-ID: 2015221
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1618835212253287 2.9807e-08  
a 2.259958520079598 6.5506e-09 au
q 1.89410847702593 6.7504e-08 au
i 3.086200458706919 3.1667e-06 deg
node 92.95800873511028 7.4814e-05 deg
peri 338.8844565599422 7.5887e-05 deg
M 163.3609668490797 1.2951e-05 deg
tp 2458637.387817199922
(2019-Jun-02.88781720)
4.3803e-05 TDB
period 1240.9352718591
3.40
5.3953e-06
1.477e-08
d
yr
n .2901037694421144 1.2613e-09 deg/d
Q 2.625808563133265 7.611e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1645  
   data-arc span      14119 days (38.66 yr)  
   first obs. used      1981-10-24  
   last obs. used      2020-06-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51512  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 00:52:10  

Additional Information
 Earth MOID = .908679 au 
 Jupiter MOID = 2.63498 au 
 T_jup = 3.601 
[ 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 14.98   n/a E2021B10  
diameter diameter 2.382 km 0.369 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.340   0.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15221 (1981 UA23)          Discovered 1981-Oct-24 by Bus, S. J. at Palomar
Reference: 20000621/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 UA23 = 1981 WX2 = 1986 ED4 = 1998 US15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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