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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457504.5 (2016-Apr-26.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .144051791204065 2.634e-08  
q 1.920781248876722 5.7272e-08 au
tp 2457700.704986058167
(2016-Nov-08.20498606)
5.2264e-05 TDB
node 139.5496116291615 4.4704e-05 deg
peri 156.7170651786917 4.7152e-05 deg
i 5.086991113532873 3.2337e-06 deg
  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
 Jupiter MOID = 2.6175 au 
 T_jup = 3.614 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.937912968372742E-16 -1.502477832274028E-15 1.882531295112043E-13 1.786784006499001E-15 3.576162862813574E-14 -2.940319239646044E-16
q -1.502477832274028E-15 3.280101260062968E-15 -4.336656530565926E-13 -3.877343907423065E-15 -8.642471868986614E-14 6.93257593913577E-16
tp 1.882531295112043E-13 -4.336656530565926E-13 2.731567581974469E-9 2.074420429407114E-11 8.010176358030213E-10 -8.702493248280621E-13
node 1.786784006499001E-15 -3.877343907423065E-15 2.074420429407114E-11 1.998418670349858E-9 -1.984158495830595E-9 5.854191057936966E-11
peri 3.576162862813574E-14 -8.642471868986614E-14 8.010176358030213E-10 -1.984158495830595E-9 2.223298467623108E-9 -5.85736931328365E-11
i -2.940319239646044E-16 6.93257593913577E-16 -8.702493248280621E-13 5.854191057936966E-11 -5.85736931328365E-11 1.045654229265305E-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 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

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