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21459 Chrisrussell (1998 HS51)
Classification: Main-belt Asteroid          SPK-ID: 2021459
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1320318964667486 5.5235e-08  
a 2.262032949157631 1.3815e-08 au
q 1.963372449010077 1.3104e-07 au
i 7.055099128483407 7.2586e-06 deg
node 46.82737038676164 4.2456e-05 deg
peri 241.2045400030645 5.1402e-05 deg
M 72.3339014160768 3.0419e-05 deg
tp 2457350.818591275568
0.00010478 JED
period 1242.644256442909
n .2897047953454565 2.654e-09 deg/d
Q 2.560693449305185 1.5639e-08 au
  Orbit Determination Parameters
   # obs. used (total)      959  
   data-arc span      23889 days (65.40 yr)  
   first obs. used      1950-03-21  
   last obs. used      2015-08-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52526  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 19:33:00  

Additional Information
 Earth MOID = .958434 au 
 Jupiter MOID = 2.58081 au 
 T_jup = 3.598 
[ 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 14.3 mag n/a MPO337439  

21459 Chrisrussell           Discovered 1998 Apr. 30 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Christopher T. Russell (b. 1943) is a professor of geophysics and planetary physics at the University of California, Los Angeles. Principal Investigator of the Dawn mission to (1) Ceres and (4) Vesta, Russell has wide-ranging interests that include space physics, Venus, Jupiter, Jupiter I (Io) and Mercury.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

Alternate Designations
 1998 HS51 = 1992 SL24 = 1999 VB214 = 1999 XC24 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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