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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1824418275661585 3.8207e-08  
a 2.321265381879624 9.6917e-09 au
q 1.897769483343449 8.9508e-08 au
i 12.69438309243392 4.7512e-06 deg
node 194.66138351 1.7749e-05 deg
peri 62.67209473220222 2.1146e-05 deg
M 43.19876182634871 1.1125e-05 deg
tp 2458845.491891365454
(2019-Dec-27.99189137)
3.9718e-05 TDB
period 1291.771262629107
3.54
8.0901e-06
2.215e-08
d
yr
n .2786871100285215 1.7454e-09 deg/d
Q 2.7447612804158 1.146e-08 au
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      23980 days (65.65 yr)  
   first obs. used      1954-12-05  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54041  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:21:32  

Additional Information
 Earth MOID = .921385 au 
 Jupiter MOID = 2.3549 au 
 T_jup = 3.523 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457100.5 (2015-Mar-19.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1823220817833006 3.8278e-08  
q 1.898298734058451 8.9658e-08 au
tp 2457553.143616907388
(2016-Jun-13.64361691)
3.898e-05 TDB
node 194.72519517291 1.7759e-05 deg
peri 62.50401934529702 2.1142e-05 deg
i 12.68914436438666 4.7501e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      667  
   data-arc span      23980 days (65.65 yr)  
   first obs. used      1954-12-05  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54041  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:21:32  

Additional Information
 Jupiter MOID = 2.3549 au 
 T_jup = 3.523 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.465188243709116E-15 -3.418751724259732E-15 -2.624338526350223E-13 9.825609028787823E-15 -7.6723621439922E-14 -1.161088497859499E-14
q -3.418751724259732E-15 8.038545640088308E-15 6.101525595862966E-13 -2.300283326356387E-14 1.71037008803502E-13 2.730299138256786E-14
tp -2.624338526350223E-13 6.101525595862966E-13 1.519401886224849E-9 5.125509017328409E-12 4.567586723200702E-10 5.692846985622494E-12
node 9.825609028787823E-15 -2.300283326356387E-14 5.125509017328409E-12 3.153889664457024E-10 -3.056881562296257E-10 1.127196189419411E-11
peri -7.6723621439922E-14 1.71037008803502E-13 4.567586723200702E-10 -3.056881562296257E-10 4.469795246479104E-10 -9.52790970432916E-12
i -1.161088497859499E-14 2.730299138256786E-14 5.692846985622494E-12 1.127196189419411E-11 -9.52790970432916E-12 2.256309273853819E-11

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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