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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3107329562196905 4.2355e-08  
a 2.619034488201773 7.6549e-09 au
q 1.805214159241512 1.1135e-07 au
i 16.00463942976802 4.2995e-06 deg
node 290.5259856659415 1.5114e-05 deg
peri 54.83377764712474 1.5748e-05 deg
M 221.9206721942912 6.4801e-06 deg
tp 2459594.294835912650
(2022-Jan-14.79483591)
2.9232e-05 TDB
period 1548.140075170006
4.24
6.7873e-06
1.858e-08
d
yr
n .2325370977561363 1.0195e-09 deg/d
Q 3.432854817162035 1.0034e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2618  
   data-arc span      32074 days (87.81 yr)  
   first obs. used      1932-07-04  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37905  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:21:26  

Additional Information
 Earth MOID = .843757 au 
 Jupiter MOID = 2.15114 au 
 T_jup = 3.283 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456901.5 (2014-Sep-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3078984058406004 4.2116e-08  
q 1.815246307181173 1.1042e-07 au
tp 2456492.271766374323
(2013-Jul-18.77176637)
2.4962e-05 TDB
node 290.7586648648128 1.5017e-05 deg
peri 54.22839710021065 1.5721e-05 deg
i 16.04798193835947 4.3053e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2618  
   data-arc span      32074 days (87.81 yr)  
   first obs. used      1932-07-04  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37905  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:21:26  

Additional Information
 Jupiter MOID = 2.15114 au 
 T_jup = 3.283 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.773782707789584E-15 -4.645307089617268E-15 -2.52949417157169E-13 7.141215258848977E-15 -6.411341360934552E-14 8.367895876724185E-17
q -4.645307089617268E-15 1.219339626271025E-14 6.801015156550081E-13 -1.848756775254788E-14 1.718882836723725E-13 5.913983419742782E-17
tp -2.52949417157169E-13 6.801015156550081E-13 6.230767642570319E-10 -6.303284347417986E-12 1.412668641454286E-10 1.558050726926675E-12
node 7.141215258848977E-15 -1.848756775254788E-14 -6.303284347417986E-12 2.254974410681533E-10 -2.175951353147637E-10 2.515090142489308E-11
peri -6.411341360934552E-14 1.718882836723725E-13 1.412668641454286E-10 -2.175951353147637E-10 2.47149555330029E-10 -2.389228668301308E-11
i 8.367895876724185E-17 5.913983419742782E-17 1.558050726926675E-12 2.515090142489308E-11 -2.389228668301308E-11 1.85359584732033E-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-August); 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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