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11889 (1991 AH2)
Classification: Main-belt Asteroid          SPK-ID: 2011889
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1779205779819013 5.9735e-08  
a 2.766005913167902 2.5558e-08 AU
q 2.273876542395712 1.6169e-07 AU
i 19.10769390103807 7.0156e-06 deg
node 120.8806419529005 1.7341e-05 deg
peri 215.05433447 2.4671e-05 deg
M 155.0297862912853 2.0299e-05 deg
tp 2456276.913041531439
(2012-Dec-15.41304153)
9.144e-05 JED
period 1680.266168717056
4.60
2.3288e-05
6.376e-08
d
yr
n .2142517695722416 2.9695e-09 deg/d
Q 3.258135283940093 3.0105e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1060  
   data-arc span      8924 days (24.43 yr)  
   first obs. used      1991-01-07  
   last obs. used      2015-06-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46222  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 12:08:09  

Additional Information
 Earth MOID = 1.28476 AU 
 T_jup = 3.237 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO337359  

11889 (1991 AH2)          Discovered 1991-Jan-07 by McNaught, R. H. at Siding Spring
Reference: 19991026/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 AH2 = 1998 KZ55 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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