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

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1049206104216899 7.666e-08  
a 1.946221320505136 1.2636e-08 au
q 1.74202259154203 1.4458e-07 au
i 23.61270969275151 8.8712e-06 deg
node 150.5531245941683 1.5773e-05 deg
peri 279.0550215785132 4.54e-05 deg
M 258.4962782077802 4.0537e-05 deg
tp 2457880.118712401336
0.00011181 JED
period 991.714734071915
n .3630076146210552 3.5354e-09 deg/d
Q 2.150420049468243 1.3962e-08 au
  Orbit Determination Parameters
   # obs. used (total)      674  
   data-arc span      23858 days (65.32 yr)  
   first obs. used      1950-02-17  
   last obs. used      2015-06-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5318  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 13:02:06  

Additional Information
 Earth MOID = .862183 au 
 Jupiter MOID = 3.05929 au 
 T_jup = 3.788 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0 mag n/a MPO337580  
rotation period rot_per 4.829 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Stephens, R.D. (2015) Minor Planet Bul. 42, 198-203.]

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 | Physical Parameters | Discovery Circumstances ]
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