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39791 Jameshesser (1997 PH4)
Classification: Inner Main-belt Asteroid          SPK-ID: 2039791
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1050497570933272 3.5753e-08  
a 1.946260156913673 6.6397e-09 au
q 1.741806000189471 7.1412e-08 au
i 23.6117204382241 4.7429e-06 deg
node 150.5120800845987 9.96e-06 deg
peri 279.2621951942572 2.5474e-05 deg
M 46.52060836827551 2.2145e-05 deg
tp 2458872.342906418932
6.1014e-05 TDB
period 991.7444183865629
n .3629967492891691 1.8576e-09 deg/d
Q 2.150714313637875 7.3372e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1314  
   data-arc span      25526 days (69.89 yr)  
   first obs. used      1950-02-17  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48819  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 05:52:12  

Additional Information
 Earth MOID = .862836 au 
 Jupiter MOID = 3.05271 au 
 T_jup = 3.788 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.1   n/a MPO502431  
diameter diameter 1.617 km 0.277 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.829 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2015) Minor Planet Bull. 42, 200-203.]
geometric albedo albedo 0.890   0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

39791 Jameshesser           Discovered 1997 Aug. 13 by D. D. Balam at National Research Council of Canada.
James E. Hesser, acting director of the Herzberg Institute of Astrophysics and 1997 recipient of the Michael Smith Award for Science Promotion, has contributed to the study of atomic and molecular spectroscopy, rapidly varying degenerate stars, stellar populations and chemical evolution in the Milky Way and nearby galaxies.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020724/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1997 PH4 = 1977 CF1 = 2000 QL117 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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