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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1468016274824687 2.8981e-08  
a 2.597959008335276 1.0384e-08 au
q 2.216574397778917 7.8685e-08 au
i 12.13254767133159 8.1304e-07 deg
node 234.4385813422002 1.5699e-06 deg
peri 189.71527849 7.3209e-06 deg
M 357.1348702843971 1.0405e-05 deg
tp 2459408.672748705615
(2021-Jul-13.17274871)
4.4241e-05 TDB
period 1529.490797626747
4.19
9.1699e-06
2.511e-08
d
yr
n .2353724524257343 1.4111e-09 deg/d
Q 2.979343618891635 1.1908e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2115  
   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      .44966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:20:45  

Additional Information
 Earth MOID = 1.23011 au 
 Jupiter MOID = 2.35897 au 
 T_jup = 3.370 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457476.5 (2016-Mar-29.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1485802821029202 2.9177e-08  
q 2.211976309736123 7.9404e-08 au
tp 2457874.097644881187
(2017-Apr-30.59764488)
3.9961e-05 TDB
node 234.537694084219 1.5683e-06 deg
peri 188.70934453141 7.1635e-06 deg
i 12.15029287869274 8.154e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2115  
   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      .44966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:20:45  

Additional Information
 Jupiter MOID = 2.35897 au 
 T_jup = 3.370 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.512758238792522E-16 -2.30389551979256E-15 -4.484060387698595E-13 1.492532987783719E-14 -6.750794206390224E-14 1.29030060178598E-14
q -2.30389551979256E-15 6.305069377373021E-15 1.271726326293008E-12 -3.951629798350562E-14 1.869929064166874E-13 -3.456243441521793E-14
tp -4.484060387698595E-13 1.271726326293008E-12 1.596889423581761E-9 -2.268874404927165E-12 2.793343416739364E-10 -8.002430893662107E-12
node 1.492532987783719E-14 -3.951629798350562E-14 -2.268874404927165E-12 2.459554789381411E-12 -1.709116897796488E-12 5.16065335344807E-13
peri -6.750794206390224E-14 1.869929064166874E-13 2.793343416739364E-10 -1.709116897796488E-12 5.131563408644642E-11 -1.749890971568989E-12
i 1.29030060178598E-14 -3.456243441521793E-14 -8.002430893662107E-12 5.16065335344807E-13 -1.749890971568989E-12 6.648823128850362E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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

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