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1246 Chaka (1932 OA)
Classification: Main-belt Asteroid          SPK-ID: 2001246
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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 is not working, here are some notes that might help.
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3107329589467116 4.2987e-08  
a 2.619034488627969 7.7179e-09 au
q 1.805214152393113 1.1289e-07 au
i 16.00463970148842 4.5876e-06 deg
node 290.5259856746911 1.5126e-05 deg
peri 54.83377698044179 1.5889e-05 deg
M 221.9206724608114 6.5518e-06 deg
tp 2459594.294834911452
2.9482e-05 TDB
period 1548.1400755479
n .2325370976993751 1.0279e-09 deg/d
Q 3.432854824862826 1.0116e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2466  
   data-arc span      31990 days (87.58 yr)  
   first obs. used      1932-07-04  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38764  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:49:29  

Additional Information
 Earth MOID = .843757 au 
 Jupiter MOID = 2.15114 au 
 T_jup = 3.283 
[ 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 10.9   n/a MPO384758  
diameter diameter 17.634 km 0.498 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 25.462 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Garlitz, J. (2013) Posting on CALL web site.]
[Ferrero, A. (2014) Minor Planet Bull. 41, 184-185.]
geometric albedo albedo 0.195   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

1246 Chaka (1932 OA)          Discovered 1932-Jul-23 by Jackson, C. at Johannesburg (UO)
Subsequently reported as discovered on July 4.
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Feb-29 13:47 UT
(server date/time)  
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