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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08943253493653162 6.4741e-08  
a 3.189462674818622 3.4182e-08 AU
q 2.904220942724142 2.1889e-07 AU
i 5.073505004671856 6.8648e-06 deg
node 15.30723826388797 6.7384e-05 deg
peri 204.5706385630378 7.7667e-05 deg
M 278.7444006995661 4.1131e-05 deg
tp 2457470.097212250796
(2016-Mar-22.59721225)
0.00023948 JED
period 2080.53350003886
5.70
3.3446e-05
9.157e-08
d
yr
n .1730325418904699 2.7816e-09 deg/d
Q 3.474704406913102 3.7239e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1017  
   data-arc span      6333 days (17.34 yr)  
   first obs. used      1998-01-18  
   last obs. used      2015-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55095  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 17:04:06  

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  
rotation period rot_per 3.6974 h n/a LCDB (Rev. 2015-July); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J., in press.]

31211 (1998 BW8)          Discovered 1998-Jan-18 by BAO Schmidt CCD Asteroid Program at Xinglong
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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