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21502 Cruz (1998 KB9)
Classification: Main-belt Asteroid          SPK-ID: 2021502
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1234163712412435 6.0819e-08  
a 2.601926605197758 1.886e-08 au
q 2.280806265348204 1.6175e-07 au
i 3.684539705781204 6.2571e-06 deg
node 115.8817543349172 9.446e-05 deg
peri 205.9433342681916 9.7881e-05 deg
M 45.19279501647296 2.7012e-05 deg
tp 2457408.054530867682
0.00011441 JED
period 1532.995887118322
n .2348342895274929 2.5532e-09 deg/d
Q 2.923046945047313 2.1187e-08 au
  Orbit Determination Parameters
   # obs. used (total)      792  
   data-arc span      6760 days (18.51 yr)  
   first obs. used      1997-02-03  
   last obs. used      2015-08-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52606  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:57:18  

Additional Information
 Earth MOID = 1.26817 au 
 Jupiter MOID = 2.34879 au 
 T_jup = 3.400 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5 mag n/a MPO299116  

21502 Cruz           Discovered 1998 May 24 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Jose Cruz (b. 1946), operations group head and telescope operator at the Arecibo Observatory, has played a key role in numerous radar experiments on minor planets since the 1970s.
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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-Apr-28 21:51 UT
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