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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09307333961689976 6.1344e-08  
a 2.582148821338185 1.9933e-08 AU
q 2.341819607148399 1.6185e-07 AU
i 9.971992362184574 5.722e-06 deg
node 140.5335635715178 3.7588e-05 deg
peri 214.5416743573848 5.0879e-05 deg
M 36.69861132146154 3.4735e-05 deg
tp 2456846.003921453307
(2014-Jul-07.50392145)
0.00014632 JED
period 1515.550214955498
4.15
1.7549e-05
4.805e-08
d
yr
n .2375374939395003 2.7505e-09 deg/d
Q 2.822478035527971 2.1788e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1146  
   data-arc span      12179 days (33.34 yr)  
   first obs. used      1981-10-23  
   last obs. used      2015-02-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48845  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:20:00  

Additional Information
 Earth MOID = 1.34264 AU 
 T_jup = 3.397 
[ 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 12.8 mag n/a MPO319208  
rotation period rot_per 15.9621 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J., in press.]

9855 (1991 CU)          Discovered 1991-Feb-07 by McNaught, R. H. at Siding Spring
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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