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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 ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2484356754964273 7.9524e-08  
a 2.648505867772425 2.5018e-08 au
q 1.990522523456131 2.0438e-07 au
i 10.90678917499067 7.9156e-06 deg
node 304.5690458070542 4.0827e-05 deg
peri 73.42053637855844 4.3926e-05 deg
M 338.9633314785841 2.1447e-05 deg
tp 2457692.497134235307
(2016-Oct-30.99713424)
9.4671e-05 JED
period 1574.344734813614
4.31
2.2307e-05
6.107e-08
d
yr
n .2286665633258654 3.24e-09 deg/d
Q 3.306489212088719 3.1233e-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 = 1.02237 au 
 Jupiter MOID = 2.31305 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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