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18417 (1993 QY9)
Classification: Main-belt Asteroid          SPK-ID: 2018417
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .144423877172047 2.6362e-08  
a 2.24371209121321 6.4288e-09 au
q 1.919666491742397 5.7348e-08 au
i 5.088558307109404 3.2346e-06 deg
node 139.5242369685882 4.4681e-05 deg
peri 156.5476313048353 4.7111e-05 deg
M 79.91433675694255 1.5312e-05 deg
tp 2458927.996981047576
(2020-Mar-19.49698105)		 5.2121e-05 TDB
period 1227.578064262043
3.36		 5.276e-06
1.444e-08		 d
yr
n .2932603721755273 1.2604e-09 deg/d
Q 2.567757690684024 7.3573e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1113  
   data-arc span      11049 days (30.25 yr)  
   first obs. used      1990-11-13  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51633  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:28:50  

Additional Information
 Earth MOID = .903118 au 
 Jupiter MOID = 2.6175 au 
 T_jup = 3.614 
[ 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 16.09   n/a E2021B10  
diameter diameter 1.550 km 0.399 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.423   0.218 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18417 (1993 QY9)          Discovered 1993-Aug-20 by Elst, E. W. at La Silla
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1993 QY9 = 1994 YZ2 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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