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JPL Small-Body Database Browser
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51570 Phendricksen (2001 HE4)
Classification: Main-belt Asteroid          SPK-ID: 2051570
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .18480352970068 5.37e-08  
a 2.726440601969801 1.992e-08 au
q 2.222584755206535 1.4552e-07 au
i 12.45616888693953 5.2006e-06 deg
node 58.89013945620103 2.5172e-05 deg
peri 299.27206240 2.8773e-05 deg
M 245.329030569444 1.9004e-05 deg
tp 2459124.273438862625
(2020-Oct-01.77343886)
9.0457e-05 TDB
period 1644.343279967949
4.50
1.8021e-05
4.934e-08
d
yr
n .2189323874069756 2.3993e-09 deg/d
Q 3.230296448733067 2.3601e-08 au
  Orbit Determination Parameters
   # obs. used (total)      778  
   data-arc span      7453 days (20.41 yr)  
   first obs. used      1998-12-14  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58255  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 04:45:22  

Additional Information
 Earth MOID = 1.25007 au 
 Jupiter MOID = 2.32046 au 
 T_jup = 3.298 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO296514  
diameter diameter 3.170 km 0.566 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.160   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

51570 Phendricksen           Discovered 2001 Apr. 17 by R. Dyvig at Badlands Observatory.
Peter B. Hendricksen (b. 1951) is an electrical engineer, mathematician, accomplished classical guitarist and past president of the Black Hills Astronomical Society. Following a devastating fire during the construction phase of Badlands Observatory, he put forth a tremendous volunteer effort in the salvage and reconstruction.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20090806/MPCPages.arcLast Updated: 2011-05-09

Alternate Designations
 2001 HE4 = 1998 XR67 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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