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JPL Small-Body Database Browser
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9161 Beaufort (1987 BZ1)
Classification: Main-belt Asteroid          SPK-ID: 2009161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1323011805972545 3.3088e-08  
a 2.657560706993743 1.2703e-08 au
q 2.305962287949596 8.835e-08 au
i 14.07839136348839 4.0049e-06 deg
node 139.8843364594861 1.4837e-05 deg
peri 281.2745742271713 2.0876e-05 deg
M 301.7488190642086 1.5621e-05 deg
tp 2459256.550395707440
(2021-Feb-11.05039571)
6.9206e-05 TDB
period 1582.425299776907
4.33
1.1345e-05
3.106e-08
d
yr
n .2274988905010261 1.6311e-09 deg/d
Q 3.009159126037889 1.4383e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1655  
   data-arc span      11931 days (32.67 yr)  
   first obs. used      1987-01-27  
   last obs. used      2019-09-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5089  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:12:51  

Additional Information
 Earth MOID = 1.36765 au 
 Jupiter MOID = 2.33863 au 
 T_jup = 3.332 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2   n/a MPO435786  
diameter diameter 6.309 km 0.183 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.255   0.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9161 Beaufort           Discovered 1987 Jan. 26 by E. W. Elst at the European Southern Observatory.
Francis Beaufort (1774-1857) was an admiral of the British Navy who devised the scale for classifying wind force at sea. Since the (originally 13) force numbers of the Beaufort scale made no reference to the speed of the wind, many attempts have been made to relate the numbers with wind velocity.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

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Alternate Designations
 1987 BZ1 = 1996 DM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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