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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3108958449768613 1.2452e-08  
a 2.618737782080049 7.5216e-09 au
q 1.804583086547441 3.4199e-08 au
i 16.0046756558799 4.672e-07 deg
node 290.5244322670275 3.0474e-06 deg
peri 54.84768512246478 4.1733e-06 deg
M 268.4298240367273 5.8584e-06 deg
tp 2459594.220470990958
(2022-Jan-14.72047099)
2.6275e-05 TDB
period 1547.877003246057
4.24
6.6688e-06
1.826e-08
d
yr
n .2325766189723363 1.002e-09 deg/d
Q 3.432892477612658 9.8601e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2842  
   data-arc span      32403 days (88.71 yr)  
   first obs. used      1932-07-04  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .373  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:19:20  

Additional Information
 Earth MOID = .841425 au 
 Jupiter MOID = 2.15159 au 
 T_jup = 3.283 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457038.5 (2015-Jan-16.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .308060547242669 1.2369e-08  
q 1.815611118086405 3.3944e-08 au
tp 2456492.703595248289
(2013-Jul-19.20359525)
2.0326e-05 TDB
node 290.7485682238182 3.0327e-06 deg
peri 54.34448058106747 4.1802e-06 deg
i 16.03747098903533 4.6841e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2842  
   data-arc span      32403 days (88.71 yr)  
   first obs. used      1932-07-04  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .373  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:19:20  

Additional Information
 Jupiter MOID = 2.15159 au 
 T_jup = 3.283 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.529953899034131E-16 -4.15049948014109E-16 -2.303047443375933E-14 8.217236806764598E-15 -8.551768685430627E-15 5.38567325857376E-16
q -4.15049948014109E-16 1.152185237396383E-15 8.088853840610604E-14 -2.138403472303578E-14 2.761470184363601E-14 -1.387587483316611E-15
tp -2.303047443375933E-14 8.088853840610604E-14 4.131474271568295E-10 -4.047432895150174E-13 6.103208633570952E-11 1.091115374153503E-13
node 8.217236806764598E-15 -2.138403472303578E-14 -4.047432895150174E-13 9.197087100234829E-12 -8.588772069688168E-12 8.967095988946234E-13
peri -8.551768685430627E-15 2.761470184363601E-14 6.103208633570952E-11 -8.588772069688168E-12 1.747410938889639E-11 -8.31519115784825E-13
i 5.38567325857376E-16 -1.387587483316611E-15 1.091115374153503E-13 8.967095988946234E-13 -8.31519115784825E-13 2.194083839277189E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.94   n/a MPCxxxxx  
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. 2020-October); 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.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
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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