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JPL Small-Body Database Browser
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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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .002741379631335888 4.7249e-08  
a 2.735754584614915 1.336e-08 au
q 2.728254842720318 1.2784e-07 au
i 6.254104542978186 3.6714e-06 deg
node 66.14673741255457 3.9358e-05 deg
peri 325.5292848989998 0.00074785 deg
M 190.2780930332709 0.00074509 deg
tp 2459779.701055963208
(2022-Jul-19.20105596)
0.0034196 TDB
period 1652.776504577834
4.53
1.2107e-05
3.315e-08
d
yr
n .2178152938421364 1.5955e-09 deg/d
Q 2.743254326509512 1.3396e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1613  
   data-arc span      11644 days (31.88 yr)  
   first obs. used      1988-03-18  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52362  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:13:03  

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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