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91220 (1999 AA8)
Classification: Main-belt Asteroid          SPK-ID: 2091220
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2004177181995966 4.1651e-08  
a 2.335106383412561 7.9867e-09 au
q 1.867109690295703 9.8425e-08 au
i 6.725218889667186 4.4722e-06 deg
node 51.93959239035653 3.183e-05 deg
peri 110.2395845893655 3.3542e-05 deg
M 331.750591554193 9.5761e-06 deg
tp 2459102.774011498830
(2020-Sep-10.27401150)
3.4809e-05 TDB
period 1303.342128746192
3.57
6.6867e-06
1.831e-08
d
yr
n .2762129697643689 1.4171e-09 deg/d
Q 2.803103076529418 9.5874e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1322  
   data-arc span      7689 days (21.05 yr)  
   first obs. used      1999-01-13  
   last obs. used      2020-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51802  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:25:44  

Additional Information
 Earth MOID = .887334 au 
 Jupiter MOID = 2.19639 au 
 T_jup = 3.532 
[ 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 14.9   n/a MPO351484  
diameter diameter 2.430 km 0.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.394   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91220 (1999 AA8)          Discovered 1999-Jan-13 by Kobayashi, T. at Oizumi
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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