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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09276916321560912 5.9757e-08  
a 2.583142739085119 1.8668e-08 au
q 2.343506748713716 1.5634e-07 au
i 9.971390173407991 5.5649e-06 deg
node 140.5342987097853 3.5551e-05 deg
peri 214.7854094050357 4.8208e-05 deg
M 131.4721755448367 3.2922e-05 deg
tp 2456846.700724589972
(2014-Jul-08.20072459)
0.0001388 JED
period 1516.425344917326
4.15
1.6438e-05
4.5e-08
d
yr
n .237400410911509 2.5735e-09 deg/d
Q 2.822778729456522 2.04e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1262  
   data-arc span      12476 days (34.16 yr)  
   first obs. used      1981-10-23  
   last obs. used      2015-12-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49796  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:12:08  

Additional Information
 Earth MOID = 1.34215 au 
 Jupiter MOID = 2.564 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 12.8 mag n/a MPO319208  
rotation period rot_per 15.9621 h n/a LCDB (Rev. 2015-December); 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. 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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