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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08943256484004539 6.8303e-08  
a 3.189462691805554 3.6502e-08 AU
q 2.904220862815748 2.2639e-07 AU
i 5.073504752344538 7.6258e-06 deg
node 15.30723877500193 6.9581e-05 deg
peri 204.5706370628465 7.9687e-05 deg
M 278.7443969896372 4.1544e-05 deg
tp 2457470.097237443020
(2016-Mar-22.59723744)
0.00024217 JED
period 2080.533516660099
5.70
3.5716e-05
9.779e-08
d
yr
n .1730325405081248 2.9704e-09 deg/d
Q 3.47470452079536 3.9767e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      860  
   data-arc span      6213 days (17.01 yr)  
   first obs. used      1998-01-18  
   last obs. used      2015-01-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5763  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 14:24:45  

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 13.6 mag n/a MPO324595  

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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