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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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .002562166064279725 4.2258e-08  
a 2.736570012561494 1.1652e-08 au
q 2.729558465742783 1.1747e-07 au
i 6.253186924997092 3.628e-06 deg
node 66.14590892097149 3.4442e-05 deg
peri 319.6898634703512 0.00060639 deg
M 239.6845057568758 0.00060618 deg
tp 2459753.120932037518
(2022-Jun-22.62093204)
0.0027848 TDB
period 1653.515507582896
4.53
1.0561e-05
2.891e-08
d
yr
n .21771794600599 1.3906e-09 deg/d
Q 2.743581559380205 1.1682e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1900  
   data-arc span      11806 days (32.32 yr)  
   first obs. used      1988-03-18  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50154  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:55:56  

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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