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9855 (1991 CU)
Classification: Main-belt Asteroid          SPK-ID: 2009855
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09322406645913633 6.2943e-08  
a 2.582579563438998 2.395e-08 AU
q 2.341820994580953 1.6886e-07 AU
i 9.971813657286841 6.4452e-06 deg
node 140.5326246697698 3.8889e-05 deg
peri 214.5544715837968 5.6215e-05 deg
M 349.1830727171211 4.4052e-05 deg
tp 2456846.049163043015
(2014-Jul-07.54916304)
0.00018569 JED
period 1515.929456366023
4.15
2.1088e-05
5.774e-08
d
yr
n .2374780689749178 3.3035e-09 deg/d
Q 2.823338132297043 2.6183e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      968  
   data-arc span      11935 days (32.68 yr)  
   first obs. used      1981-10-23  
   last obs. used      2014-06-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49976  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:22:43  

Additional Information
 Earth MOID = 1.341 AU 
 T_jup = 3.396 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7 mag n/a MPO266010  

9855 (1991 CU)          Discovered 1991-Feb-07 by McNaught, R. H. at Siding Spring (413)
Reference: 19990106/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1991 CU = 1981 UQ15 = 2001 WS102 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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