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4721 Atahualpa (4239 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2004721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer 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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1227458814675165 2.7191e-08  
a 2.254415514650867 6.1762e-09 au
q 1.977695295111002 6.0313e-08 au
i 4.366144416774954 3.2192e-06 deg
node 39.36106739174182 4.5706e-05 deg
peri 215.8499467715779 4.8301e-05 deg
M 23.05720401459583 1.5561e-05 deg
tp 2458921.313068339525
(2020-Mar-12.81306834)
5.3457e-05 TDB
period 1236.372605270137
3.39
5.0808e-06
1.391e-08
d
yr
n .2911743583329745 1.1966e-09 deg/d
Q 2.531135734190733 6.9344e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2627  
   data-arc span      17209 days (47.12 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45966  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:49:15  

Additional Information
 Earth MOID = .965061 au 
 Jupiter MOID = 2.50474 au 
 T_jup = 3.611 
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Orbital Elements at Epoch 2457002.5 (2014-Dec-11.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1229483648536832 2.721e-08  
q 1.976379256528117 6.031e-08 au
tp 2456449.047285868114
(2013-Jun-05.54728587)
5.4691e-05 TDB
node 39.40876757265806 4.5708e-05 deg
peri 215.7079332767065 4.8291e-05 deg
i 4.366893729116314 3.2191e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2627  
   data-arc span      17209 days (47.12 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45966  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:49:15  

Additional Information
 Jupiter MOID = 2.50474 au 
 T_jup = 3.611 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.403893405776436E-16 -1.634751732100195E-15 -1.776569744241865E-15 -5.879844798880239E-18 -5.765293837523505E-15 -3.928747970073716E-16
q -1.634751732100195E-15 3.637236148009239E-15 -6.383038089341103E-14 2.716523689446153E-16 -3.488303724333807E-15 9.143205927544819E-16
tp -1.776569744241865E-15 -6.383038089341103E-14 2.991135192129461E-9 3.956189901289463E-12 8.635830632332818E-10 -1.210317491230838E-12
node -5.879844798880239E-18 2.716523689446153E-16 3.956189901289463E-12 2.089218131556619E-9 -2.081606078398819E-9 -2.785066031766483E-11
peri -5.765293837523505E-15 -3.488303724333807E-15 8.635830632332818E-10 -2.081606078398819E-9 2.331979131632398E-9 2.741217100826199E-11
i -3.928747970073716E-16 9.143205927544819E-16 -1.210317491230838E-12 -2.785066031766483E-11 2.741217100826199E-11 1.03623490198807E-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 13.8   n/a MPO384796  
diameter diameter 4.608 km 0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.332   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4721 Atahualpa (4239 T-2)          Discovered 1973-Sep-29 by van Houten and Gehrels at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 4239 T-2 = 1983 RO8 = 1989 GH5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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