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20358 Dalem (1998 HD148)
Classification: Main-belt Asteroid          SPK-ID: 2020358
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1467858473488667 4.0418e-08  
a 2.599298116899403 1.3338e-08 au
q 2.217757940298011 1.0637e-07 au
i 12.13204086075163 4.7574e-06 deg
node 234.4607081401881 1.7969e-05 deg
peri 189.4600040320423 2.3142e-05 deg
M 264.1655089049798 1.7074e-05 deg
tp 2459407.975879042323
(2021-Jul-12.47587904)
7.4257e-05 TDB
period 1530.673505740136
4.19
1.1782e-05
3.226e-08
d
yr
n .2351905867906997 1.8103e-09 deg/d
Q 2.980838293500796 1.5296e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1468  
   data-arc span      10499 days (28.74 yr)  
   first obs. used      1991-09-12  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49207  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:41:06  

Additional Information
 Earth MOID = 1.23156 au 
 Jupiter MOID = 2.35643 au 
 T_jup = 3.369 
[ 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 13.4   n/a MPO340842  
diameter diameter 6.028 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.233   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20358 Dalem           Discovered 1998 Apr. 25 by E. W. Elst at the European Southern Observatory.
Henri Dalem (b. 1951) is a specialist in data processing and the webmaster (marquis) of the international Holbach foundation. Also interested in eighteenth-century studies, he currently occupies himself with the origins of despotism.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060613/MPCPages.arcLast Updated: 2008-05-22

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Alternate Designations
 1998 HD148 = 1991 RO29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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