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18355 (1990 RN9)
Classification: Main-belt Asteroid          SPK-ID: 2018355
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .24852904061 9.2767e-08  
a 2.647479443533916 2.7144e-08 AU
q 1.989503917397735 2.3617e-07 AU
i 10.90780917527997 8.5575e-06 deg
node 304.569622929812 4.1289e-05 deg
peri 73.51222803808365 4.4867e-05 deg
M 201.6269201618813 2.0204e-05 deg
tp 2457692.691375090369
(2016-Oct-31.19137509)
9.4805e-05 JED
period 1573.429621291962
4.31
2.4198e-05
6.625e-08
d
yr
n .2287995567951743 3.5187e-09 deg/d
Q 3.305454969670097 3.389e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      555  
   data-arc span      13875 days (37.99 yr)  
   first obs. used      1976-06-24  
   last obs. used      2014-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49071  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:53:43  

Additional Information
 Earth MOID = 1.02255 AU 
 T_jup = 3.322 
[ 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 13.7 mag n/a MPO256999  

18355 (1990 RN9)          Discovered 1990-Sep-14 by Holt, H. E. at Palomar
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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