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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1467858502247917 3.8004e-08  
a 2.599298117778876 1.2378e-08 au
q 2.217757933573003 1.0159e-07 au
i 12.13204266674422 4.185e-06 deg
node 234.4607065678691 1.7864e-05 deg
peri 189.4600052513309 2.3087e-05 deg
M 264.1655088390084 1.6965e-05 deg
tp 2459407.975879529629
(2021-Jul-12.47587953)
7.3669e-05 TDB
period 1530.673506516991
4.19
1.0934e-05
2.994e-08
d
yr
n .2351905866713346 1.68e-09 deg/d
Q 2.980838301984749 1.4195e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1608  
   data-arc span      10554 days (28.90 yr)  
   first obs. used      1991-09-12  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47316  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:34:45  

Additional Information
 Earth MOID = 1.23156 au 
 Jupiter MOID = 2.35643 au 
 T_jup = 3.369 
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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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