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18416 (1993 QW)
Classification: Main-belt Asteroid          SPK-ID: 2018416
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2279098971054265 3.8529e-08  
a 2.265226681409028 8.4053e-09 au
q 1.748959101528629 8.9302e-08 au
i 25.5895784092731 4.7226e-06 deg
node 157.0575475928557 9.3105e-06 deg
peri 161.0313387347997 1.3225e-05 deg
M 74.9164515058674 8.9913e-06 deg
tp 2459137.356316791884
(2020-Oct-14.85631679)
3.0854e-05 TDB
period 1245.276892854637
3.41
6.931e-06
1.898e-08
d
yr
n .2890923312442956 1.609e-09 deg/d
Q 2.781494261289426 1.0321e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1201  
   data-arc span      16124 days (44.15 yr)  
   first obs. used      1976-11-18  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4792  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:28:50  

Additional Information
 Earth MOID = .747616 au 
 Jupiter MOID = 2.6294 au 
 T_jup = 3.456 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457517.5 (2016-May-09.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2274672088701542 3.8516e-08  
q 1.750839419599588 8.928e-08 au
tp 2457891.987962376302
(2017-May-18.48796238)
3.0763e-05 TDB
node 157.0858783204302 9.311e-06 deg
peri 161.0258936159006 1.3245e-05 deg
i 25.58387501242514 4.7217e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1201  
   data-arc span      16124 days (44.15 yr)  
   first obs. used      1976-11-18  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4792  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:28:50  

Additional Information
 Jupiter MOID = 2.6294 au 
 T_jup = 3.456 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.483504448710001E-15 -3.430226989821573E-15 4.281678825058676E-14 -2.071668910715569E-15 6.325612128052016E-14 -1.220484019468986E-14
q -3.430226989821573E-15 7.970856843885847E-15 -1.132471934917625E-13 5.655510446629431E-15 -1.554641212740602E-13 2.916593049283302E-14
tp 4.281678825058676E-14 -1.132471934917625E-13 9.463552624326964E-10 9.192490539561686E-12 2.971351012768019E-10 9.606166072981635E-12
node -2.071668910715569E-15 5.655510446629431E-15 9.192490539561686E-12 8.66953841122833E-11 -7.539343720615758E-11 -2.066084107929769E-12
peri 6.325612128052016E-14 -1.554641212740602E-13 2.971351012768019E-10 -7.539343720615758E-11 1.754361769360274E-10 4.145857513117588E-12
i -1.220484019468986E-14 2.916593049283302E-14 9.606166072981635E-12 -2.066084107929769E-12 4.145857513117588E-12 2.229399445225303E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.24   n/a E2021B10  
diameter diameter 2.070 km 0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.716   0.132 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18416 (1993 QW)          Discovered 1993-Aug-22 by Helin, E. F. at Palomar
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1993 QW = 1986 PD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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