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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3103275238434381 4.3924e-08  
a 2.619841212949241 7.9367e-09 au
q 1.806832376471713 1.1522e-07 au
i 16.00356660638333 4.9016e-06 deg
node 290.5215382808871 1.524e-05 deg
peri 54.8473310237808 1.6215e-05 deg
M 128.9136730314882 6.5642e-06 deg
tp 2458045.864883426055
(2017-Oct-19.36488343)
2.7417e-05 TDB
period 1548.855426048171
4.24
7.0383e-06
1.927e-08
d
yr
n .2324296986959734 1.0562e-09 deg/d
Q 3.432850049426767 1.04e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2300  
   data-arc span      31723 days (86.85 yr)  
   first obs. used      1932-07-04  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39137  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:20:45  

Additional Information
 Earth MOID = .844501 au 
 Jupiter MOID = 2.14783 au 
 T_jup = 3.283 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456459.5 (2013-Jun-16.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3077955690408223 4.3707e-08  
q 1.814104266382449 1.145e-07 au
tp 2456491.928179392041
(2013-Jul-18.42817939)
2.6863e-05 TDB
node 290.7582941044766 1.5146e-05 deg
peri 54.07891463410721 1.6213e-05 deg
i 16.05015108847963 4.9082e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2300  
   data-arc span      31723 days (86.85 yr)  
   first obs. used      1932-07-04  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39137  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:20:45  

Additional Information
 Jupiter MOID = 2.14783 au 
 T_jup = 3.283 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.910285831591449E-15 -4.998721405459152E-15 -3.54633088710105E-13 6.591165822874908E-15 -1.009092551679891E-13 -1.531683807542027E-15
q -4.998721405459152E-15 1.311000626436847E-14 9.423532527155721E-13 -1.751902915743985E-14 2.66428306494392E-13 4.348015308871104E-15
tp -3.54633088710105E-13 9.423532527155721E-13 7.215962985407084E-10 -6.604729263534914E-12 1.753737602118102E-10 2.239446213432431E-12
node 6.591165822874908E-15 -1.751902915743985E-14 -6.604729263534914E-12 2.294011865883081E-10 -2.214236864416892E-10 2.412094445435288E-11
peri -1.009092551679891E-13 2.66428306494392E-13 1.753737602118102E-10 -2.214236864416892E-10 2.62855681913747E-10 -2.278760611127878E-11
i -1.531683807542027E-15 4.348015308871104E-15 2.239446213432431E-12 2.412094445435288E-11 -2.278760611127878E-11 2.409032971963808E-11

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] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 25.462 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Garlitz, J. (2013) Posting on CALL web site. http://www.minorplanet.info/call.html]
[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] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

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 ]
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