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18648 (1998 FW9)
Classification: Main-belt Asteroid          SPK-ID: 2018648
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1824418276132758 3.8349e-08  
a 2.3212653818782 9.7155e-09 au
q 1.897769483232913 8.9883e-08 au
i 12.69438301653576 4.7599e-06 deg
node 194.6613832237994 1.7783e-05 deg
peri 62.6720949944703 2.117e-05 deg
M 43.19876184514717 1.1128e-05 deg
tp 2458845.491891298143
(2019-Dec-27.99189130)
3.9727e-05 TDB
period 1291.771262627918
3.54
8.1099e-06
2.22e-08
d
yr
n .2786871100287781 1.7496e-09 deg/d
Q 2.744761280523488 1.1488e-08 au
  Orbit Determination Parameters
   # obs. used (total)      660  
   data-arc span      23920 days (65.49 yr)  
   first obs. used      1954-12-05  
   last obs. used      2020-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5422  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:24:24  

Additional Information
 Earth MOID = .921385 au 
 Jupiter MOID = 2.3549 au 
 T_jup = 3.523 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.9   n/a MPO435872  

18648 (1998 FW9)          Discovered 1998-Mar-24 by ODAS at Caussols
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 FW9 = 1991 GX2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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