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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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1227458792364514 2.7957e-08  
a 2.254415515197818 6.3869e-09 au
q 1.977695300620565 6.2419e-08 au
i 4.366147016062461 3.5113e-06 deg
node 39.36106532052533 4.5772e-05 deg
peri 215.8499504267554 4.8576e-05 deg
M 23.05720196733563 1.6625e-05 deg
tp 2458921.313075341753
(2020-Mar-12.81307534)
5.7082e-05 TDB
period 1236.372605720078
3.39
5.2541e-06
1.438e-08
d
yr
n .2911743582270103 1.2374e-09 deg/d
Q 2.531135729775072 7.1709e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2482  
   data-arc span      17123 days (46.88 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .464  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:19:29  

Additional Information
 Earth MOID = .965061 au 
 Jupiter MOID = 2.50474 au 
 T_jup = 3.611 
[ 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 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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