Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0894325707733809 7.4362e-08  
a 3.189462694325182 4.0503e-08 AU
q 2.904220846185887 2.3939e-07 AU
i 5.073509582570427 8.4581e-06 deg
node 15.30725663839353 7.0737e-05 deg
peri 204.5706191837699 8.074e-05 deg
M 278.7443963632109 4.2038e-05 deg
tp 2457470.097241619762
(2016-Mar-22.59724162)
0.00024562 JED
period 2080.533519125485
5.70
3.9631e-05
1.085e-07
d
yr
n .1730325403030851 3.296e-09 deg/d
Q 3.474704542464477 4.4125e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      846  
   data-arc span      6168 days (16.89 yr)  
   first obs. used      1998-01-18  
   last obs. used      2014-12-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .57613  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 03:23:31  

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2015-Jan-30 18:32 UT
(server date/time)  
NASA Home Page
Site Manager:   Donald K. Yeomans
Webmaster  Alan B. Chamberlin