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31211 (1998 BW8)
Classification: Main-belt Asteroid          SPK-ID: 2031211
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08943257097591487 7.7611e-08  
a 3.189462694622552 4.2443e-08 AU
q 2.904220845810688 2.4663e-07 AU
i 5.073510812950341 8.8122e-06 deg
node 15.30725957311602 7.0986e-05 deg
peri 204.5706167261271 8.0964e-05 deg
M 278.7443958108196 4.2226e-05 deg
tp 2457470.097244877849
(2016-Mar-22.59724488)
0.00024697 JED
period 2080.533519416453
5.70
4.1529e-05
1.137e-07
d
yr
n .1730325402788861 3.4538e-09 deg/d
Q 3.474704543434416 4.6238e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      831  
   data-arc span      5896 days (16.14 yr)  
   first obs. used      1998-01-18  
   last obs. used      2014-03-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .572  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 14:29:10  

Additional Information
 Earth MOID = 1.89903 AU 
 T_jup = 3.185 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5 mag n/a MPO250512  

31211 (1998 BW8)          Discovered 1998-Jan-18 by BAO Schmidt CCD Asteroid Program at Xinglong (327)
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 BW8 = 1999 HZ2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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