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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1619122665755542 3.302e-08  
a 2.260067631871769 7.0857e-09 au
q 1.894134958981365 7.5721e-08 au
i 3.086178256297901 3.5651e-06 deg
node 92.95858987782015 7.5169e-05 deg
peri 338.9213014109216 7.625e-05 deg
M 105.292731806716 1.2914e-05 deg
tp 2458637.525201463552
(2019-Jun-03.02520146)
4.3948e-05 TDB
period 1241.025142295592
3.40
5.8363e-06
1.598e-08
d
yr
n .2900827612034422 1.3642e-09 deg/d
Q 2.626000304762172 8.233e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1442  
   data-arc span      13982 days (38.28 yr)  
   first obs. used      1981-10-24  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53734  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 21:13:35  

Additional Information
 Earth MOID = .909217 au 
 Jupiter MOID = 2.63446 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 14.9   n/a MPO412295  
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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