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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09241472467738977 5.5895e-08  
a 2.584389134848264 1.6948e-08 au
q 2.345553524492025 1.4353e-07 au
i 9.96736944337859 5.4974e-06 deg
node 140.5263981863598 2.8301e-05 deg
peri 215.1169373921424 3.9943e-05 deg
M 178.5682901559433 3.0143e-05 deg
tp 2456847.773638211410
(2014-Jul-09.27363821)
0.00012557 JED
period 1517.523016025101
4.15
1.4928e-05
4.087e-08
d
yr
n .2372286918869672 2.3336e-09 deg/d
Q 2.823224745204504 1.8514e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1464  
   data-arc span      12590 days (34.47 yr)  
   first obs. used      1981-10-23  
   last obs. used      2016-04-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49456  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:06:35  

Additional Information
 Earth MOID = 1.34544 au 
 Jupiter MOID = 2.56533 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 12.9 mag n/a MPO365367  
rotation period rot_per 15.9621 h n/a LCDB (Rev. 2016-February); 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. (2016) Astron. J. 150, A75.]

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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