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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1763590691429553 5.163e-08  
a 3.096595467677423 2.0987e-08 au
q 2.550482773485538 1.6286e-07 au
i 1.112411364685737 5.1694e-06 deg
node 145.6658241125366 0.00029792 deg
peri 285.5283713448883 0.00029843 deg
M 72.24420966098253 1.4752e-05 deg
tp 2457001.083794846558
(2014-Dec-09.58379485)
8.1441e-05 JED
period 1990.330222034345
5.45
2.0234e-05
5.54e-08
d
yr
n .18087450816681 1.8388e-09 deg/d
Q 3.642708161869308 2.4689e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1430  
   data-arc span      22280 days (61.00 yr)  
   first obs. used      1954-12-21  
   last obs. used      2015-12-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53027  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:56:46  

Additional Information
 Earth MOID = 1.56455 au 
 Jupiter MOID = 1.65637 au 
 T_jup = 3.199 
[ 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 MPO358684  

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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