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11991 (1995 WK7)
Classification: Main-belt Asteroid          SPK-ID: 2011991
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .002741360560217792 4.1929e-08  
a 2.735754579292227 1.1757e-08 au
q 2.72825488958612 1.1621e-07 au
i 6.254105178690977 3.6288e-06 deg
node 66.1467583960785 3.4605e-05 deg
peri 325.5296628599188 0.00058112 deg
M 190.277697315111 0.00058061 deg
tp 2459779.702870449395
(2022-Jul-19.20287045)
0.0026663 TDB
period 1652.776499754367
4.53
1.0655e-05
2.917e-08
d
yr
n .217815294477809 1.4042e-09 deg/d
Q 2.743254268998334 1.179e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1867  
   data-arc span      11781 days (32.25 yr)  
   first obs. used      1988-03-18  
   last obs. used      2020-06-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50221  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 17:22:31  

Additional Information
 Earth MOID = 1.72498 au 
 Jupiter MOID = 2.23763 au 
 T_jup = 3.344 
[ 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 MPO337360  
diameter diameter 8.393 km 0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.089   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11991 (1995 WK7)          Discovered 1995-Nov-27 by Kobayashi, T. at Oizumi
Reference: 19991026/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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