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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1490218907602334 8.0098e-08  
a 2.597015635707706 2.3103e-08 AU
q 2.210003455340654 2.0899e-07 AU
i 12.15310242998681 9.7209e-06 deg
node 234.5462144503229 3.3114e-05 deg
peri 188.7650337822481 4.4532e-05 deg
M 107.1836868345232 2.7139e-05 deg
tp 2456345.368950840891
(2013-Feb-21.86895084)
0.00011528 JED
period 1528.657788663648
4.19
2.0398e-05
5.585e-08
d
yr
n .2355007135473479 3.1425e-09 deg/d
Q 2.984027816074758 2.6545e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      691  
   data-arc span      8317 days (22.77 yr)  
   first obs. used      1991-09-12  
   last obs. used      2014-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51206  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:44:36  

Additional Information
 Earth MOID = 1.22255 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 13.3 mag n/a MPO257012  

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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