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5550 (1981 UB1)
Classification: Main-belt Asteroid          SPK-ID: 2005550
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1753011982392137 6.3489e-08  
a 3.09410901786146 2.9133e-08 AU
q 2.55170799954759 1.9447e-07 AU
i 1.110874970978675 6.5192e-06 deg
node 145.6713452636287 0.00036987 deg
peri 285.1736908147917 0.00037014 deg
M 251.5084771409269 2.0969e-05 deg
tp 2456999.594246431099
(2014-Dec-08.09424643)		 0.00011942 JED
period 1987.933462740208
5.44		 2.8076e-05
7.687e-08		 d
yr
n .1810925801831258 2.5577e-09 deg/d
Q 3.636510036175331 3.424e-08 AU
   Orbit Determination Parameters
   # obs. used (total)      1109  
   data-arc span      21292 days (58.29 yr)  
   first obs. used      1954-12-21  
   last obs. used      2013-04-07  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .55497  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Apr-29 13:17:23  

Additional Information
 Earth MOID = 1.56576 AU 
 T_jup = 3.200 
[ 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 12.2 mag n/a PDS3 (MPC 28113)  

5550 (1981 UB1)          Discovered 1981-Oct-30 by Taff, L. G. at Socorro
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 UB1 = 1975 RQ2 = 1977 AM = 1981 SP5 = 1983 CP2 = 1986 WD8 
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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