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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 ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1443206407771689 2.6364e-08  
a 2.244004876020831 6.4191e-09 au
q 1.920148654406414 5.7353e-08 au
i 5.088573227317013 3.2345e-06 deg
node 139.5227180434412 4.4674e-05 deg
peri 156.5930239184754 4.7108e-05 deg
M 137.3486145956961 1.5347e-05 deg
tp 2458928.057916798192
(2020-Mar-19.55791680)
5.2164e-05 TDB
period 1227.818354404685
3.36
5.2683e-06
1.442e-08
d
yr
n .2932029796659523 1.2581e-09 deg/d
Q 2.567861097635249 7.3455e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1114  
   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      .51976  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:00:11  

Additional Information
 Earth MOID = .905127 au 
 Jupiter MOID = 2.61641 au 
 T_jup = 3.613 
[ 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 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

Alternate Designations
 1993 QY9 = 1994 YZ2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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