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18673 (1998 FH66)
Classification: Outer Main-belt Asteroid          SPK-ID: 2018673
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09319899254649162 3.2549e-08  
a 3.250831309251827 1.8129e-08 au
q 2.947857106290964 1.0741e-07 au
i .2170998651990091 3.5469e-06 deg
node 250.1016541428854 0.0011645 deg
peri 39.70571440365882 0.0011648 deg
M 231.3720621514085 2.3132e-05 deg
tp 2459965.432096042777
(2023-Jan-20.93209604)
0.00013778 TDB
period 2140.868921490024
5.86
1.7909e-05
4.903e-08
d
yr
n .1681560213174768 1.4067e-09 deg/d
Q 3.553805512212689 1.9819e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1815  
   data-arc span      11029 days (30.20 yr)  
   first obs. used      1991-01-12  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52787  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:46:05  

Additional Information
 Earth MOID = 1.92961 au 
 Jupiter MOID = 1.58871 au 
 T_jup = 3.175 
[ 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 13.67   n/a MPCxxxxx  
diameter diameter 9.908 km 0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.072   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18673 (1998 FH66)          Discovered 1998-Mar-20 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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