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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1467587091892868 2.898e-08  
a 2.597987338531022 1.0481e-08 au
q 2.216710070238098 7.8716e-08 au
i 12.13245632607224 8.1306e-07 deg
node 234.4397094460441 1.5698e-06 deg
peri 189.6745854489333 7.3109e-06 deg
M 311.0306481293828 1.0268e-05 deg
tp 2459408.553883828877
(2021-Jul-13.05388383)
4.4202e-05 TDB
period 1529.51581585741
4.19
9.2554e-06
2.534e-08
d
yr
n .2353686024476919 1.4243e-09 deg/d
Q 2.979264606823945 1.2019e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2114  
   data-arc span      10746 days (29.42 yr)  
   first obs. used      1991-09-12  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44849  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:17:44  

Additional Information
 Earth MOID = 1.22992 au 
 Jupiter MOID = 2.35825 au 
 T_jup = 3.370 
[ 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 13.48   n/a E2021B10  
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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