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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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2485290269212759 8.308e-08  
a 2.647479440456057 2.5528e-08 AU
q 1.989503951325429 2.1284e-07 AU
i 10.90780715463085 8.1164e-06 deg
node 304.5696197548653 4.1031e-05 deg
peri 73.5122335003319 4.4248e-05 deg
M 201.6269199556436 2.0196e-05 deg
tp 2457692.691374784686
(2016-Oct-31.19137478)
9.4636e-05 JED
period 1573.429618548148
4.31
2.2757e-05
6.231e-08
d
yr
n .2287995571941649 3.3092e-09 deg/d
Q 3.305454929586684 3.1872e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      564  
   data-arc span      14214 days (38.92 yr)  
   first obs. used      1976-06-24  
   last obs. used      2015-05-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50192  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:31:26  

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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