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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .002562165277577552 4.2157e-08  
a 2.736570012980553 1.1642e-08 au
q 2.729558468313634 1.1716e-07 au
i 6.253186916034794 3.6203e-06 deg
node 66.14590890299324 3.437e-05 deg
peri 319.6898681089457 0.00060627 deg
M 239.6845010766333 0.00060607 deg
tp 2459753.120953661270
(2022-Jun-22.62095366)
0.0027842 TDB
period 1653.515507962707
4.53
1.0552e-05
2.889e-08
d
yr
n .2177179459559803 1.3894e-09 deg/d
Q 2.743581557647472 1.1672e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1907  
   data-arc span      11806 days (32.32 yr)  
   first obs. used      1988-03-18  
   last obs. used      2020-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:04:05  

Additional Information
 Earth MOID = 1.72307 au 
 Jupiter MOID = 2.23536 au 
 T_jup = 3.343 
[ 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 13.90   n/a E2021B10  
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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