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18304 (1981 DH1)
Classification: Main-belt Asteroid          SPK-ID: 2018304
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1907234947833372 3.702e-08  
a 3.065799859034078 2.1605e-08 au
q 2.481079795612836 1.1669e-07 au
i 7.224108113270038 3.863e-06 deg
node 279.9501158552715 3.5295e-05 deg
peri 104.7913752603521 3.7398e-05 deg
M 302.98040119257 1.4894e-05 deg
tp 2459511.053038809396
(2021-Oct-23.55303881)
8.3533e-05 TDB
period 1960.71344431863
5.37
2.0726e-05
5.674e-08
d
yr
n .1836066361676344 1.9409e-09 deg/d
Q 3.65051992245532 2.5726e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1152  
   data-arc span      14411 days (39.46 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-07-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51513  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:17  

Additional Information
 Earth MOID = 1.49629 au 
 Jupiter MOID = 1.89886 au 
 T_jup = 3.192 
[ 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 13.69   n/a E2021B10  
diameter diameter 6.004 km 0.159 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.214   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18304 (1981 DH1)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring
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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