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JPL Small-Body Database Browser
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56232 (1999 JM31)
Classification: Main-belt Asteroid          SPK-ID: 2056232
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2024548024499682 3.8737e-08  
a 2.193254165500938 4.4853e-09 au
q 1.749219326701875 8.5407e-08 au
i 2.933705074296773 3.6673e-06 deg
node 46.02395704978122 7.1862e-05 deg
peri 291.3230516995002 7.2284e-05 deg
M 323.4281679507145 7.1537e-06 deg
tp 2458721.024707745518
(2019-Aug-25.52470775)
2.358e-05 TDB
period 1186.402002773988
3.25
3.6394e-06
9.964e-09
d
yr
n .303438462812997 9.3083e-10 deg/d
Q 2.6372890043 5.3934e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1486  
   data-arc span      10619 days (29.07 yr)  
   first obs. used      1990-11-10  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50215  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 05:41:57  

Additional Information
 Earth MOID = .741802 au 
 Jupiter MOID = 2.74243 au 
 T_jup = 3.642 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.3   n/a MPO502529  
rotation period rot_per 5.6 h n/a LCDB (Rev. 2019-January); 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:
[Pravec, P.; Vokrouhlicky, D.; Polishook, D.; Scheeres, D.J.; et al. (2010) Nature 466, 1085-1088. Lightcurve plots as supplemental data, http://www.Nature.com/nature]

56232 (1999 JM31)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 JM31 = 2000 QH181 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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