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18685 (1998 FL117)
Classification: Main-belt Asteroid          SPK-ID: 2018685
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08947048475044816 5.1789e-08  
a 2.547352955608965 1.0631e-08 au
q 2.319440051840144 1.3365e-07 au
i 13.22172132605051 5.3685e-06 deg
node 217.6041947696402 1.5921e-05 deg
peri 333.3508799878464 2.7524e-05 deg
M 216.9744390529638 2.529e-05 deg
tp 2459790.488126928315
(2022-Jul-29.98812693)
0.00010614 TDB
period 1485.019351001501
4.07
9.2965e-06
2.545e-08
d
yr
n .2424210834405726 1.5176e-09 deg/d
Q 2.775265859377786 1.1582e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1602  
   data-arc span      9267 days (25.37 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48986  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:34:53  

Additional Information
 Earth MOID = 1.32275 au 
 Jupiter MOID = 2.20783 au 
 T_jup = 3.399 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO492953  
diameter diameter 4.359 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.234   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18685 (1998 FL117)          Discovered 1998-Mar-31 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 FL117 = 1999 ON3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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