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9003 (1981 UW21)
Classification: Main-belt Asteroid          SPK-ID: 2009003
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07392498527628279 6.4394e-08  
a 2.780801181215538 2.4894e-08 AU
q 2.57523049483791 1.8732e-07 AU
i 5.345322704576887 6.5884e-06 deg
node 124.982011330395 7.082e-05 deg
peri 274.7916799844137 8.6276e-05 deg
M 7.506079243723784 4.9689e-05 deg
tp 2456765.184612166173
(2014-Apr-17.68461217)
0.00023368 JED
period 1693.765707417521
4.64
2.2744e-05
6.227e-08
d
yr
n .2125441543794689 2.854e-09 deg/d
Q 2.986371867593167 2.6734e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1099  
   data-arc span      21531 days (58.95 yr)  
   first obs. used      1955-01-14  
   last obs. used      2013-12-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54883  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jan-22 00:27:49  

Additional Information
 Earth MOID = 1.5886 AU 
 T_jup = 3.323 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a MPO267743  
diameter diameter 21.22 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
geometric albedo albedo 0.0326   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

9003 (1981 UW21)          Discovered 1981-Oct-24 by Bus, S. J. at Palomar (675)
Reference: 19980808/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 UW21 = 1955 AA = 1981 UW19 = 1983 CO2 = 1990 ST28 = 1992 AF6 = 1995 US7 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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