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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1227474844399148 1.3839e-08  
a 2.253693661227421 5.9151e-09 au
q 1.977058433613573 3.1361e-08 au
i 4.366310358429346 7.9387e-07 deg
node 39.33837282863714 5.6432e-06 deg
peri 215.6908103345114 9.3873e-06 deg
M 81.46638718857656 7.5511e-06 deg
tp 2458920.848786732664
(2020-Mar-12.34878673)
2.5912e-05 TDB
period 1235.778831620483
3.38
4.8651e-06
1.332e-08
d
yr
n .2913142633523915 1.1469e-09 deg/d
Q 2.530328888841268 6.6411e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2811  
   data-arc span      17307 days (47.38 yr)  
   first obs. used      1973-09-19  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45606  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:41:02  

Additional Information
 Earth MOID = .962822 au 
 Jupiter MOID = 2.50397 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 13.85   n/a MPCxxxxx  
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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