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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2485544363004313 9.2749e-08  
a 2.647431459067943 2.7269e-08 AU
q 1.989400625115282 2.3604e-07 AU
i 10.90792574440508 8.5828e-06 deg
node 304.5713446185949 4.138e-05 deg
peri 73.53643544411241 4.4996e-05 deg
M 155.8248023445485 1.9826e-05 deg
tp 2456119.464738583624
(2012-Jul-10.96473858)
8.1431e-05 JED
period 1573.386844847633
4.31
2.4309e-05
6.655e-08
d
yr
n .2288057772815957 3.5351e-09 deg/d
Q 3.305462293020604 3.4047e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      553  
   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      .48979  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:40:43  

Additional Information
 Earth MOID = 1.02121 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 (675)
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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