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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2484168074404244 7.952e-08  
a 2.648161193213849 2.4922e-08 au
q 1.99031344400804 2.044e-07 au
i 10.90760079998658 7.9162e-06 deg
node 304.5694922525044 4.0824e-05 deg
peri 73.45088503697988 4.3924e-05 deg
M 293.2002208752304 2.1023e-05 deg
tp 2457692.570421963920
(2016-Oct-31.07042196)
9.4664e-05 JED
period 1574.037418755817
4.31
2.222e-05
6.084e-08
d
yr
n .228711208329824 3.2287e-09 deg/d
Q 3.306008942419658 3.1113e-08 au
  Orbit Determination Parameters
   # obs. used (total)      568  
   data-arc span      14244 days (39.00 yr)  
   first obs. used      1976-06-24  
   last obs. used      2015-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5009  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:22:43  

Additional Information
 Earth MOID = 1.02173 au 
 Jupiter MOID = 2.31401 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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