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

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1486228893711866 7.2952e-08  
a 2.597825443604275 2.1527e-08 au
q 2.211729120093823 1.9331e-07 au
i 12.1505025735146 8.5106e-06 deg
node 234.5403780103105 2.7388e-05 deg
peri 188.7280555228994 3.4974e-05 deg
M 248.5099148884096 2.2674e-05 deg
tp 2457874.138636466444
(2017-Apr-30.63863647)
9.8617e-05 JED
period 1529.372849229207
4.19
1.901e-05
5.205e-08
d
yr
n .2353906048361179 2.9259e-09 deg/d
Q 2.983921767114728 2.4727e-08 au
  Orbit Determination Parameters
   # obs. used (total)      768  
   data-arc span      8686 days (23.78 yr)  
   first obs. used      1991-09-12  
   last obs. used      2015-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51257  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:26:49  

Additional Information
 Earth MOID = 1.22435 au 
 Jupiter MOID = 2.36039 au 
 T_jup = 3.369 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.4 mag n/a MPO340842  

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

[ show close-approach data ]
Alternate Designations
 1998 HD148 = 1991 RO29 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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