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213991 (2004 BK42)
Classification: Main-belt Asteroid          SPK-ID: 2213991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2002207244944438 7.1575e-08  
a 2.770409345723656 1.7508e-08 au
q 2.215715979376687 1.9416e-07 au
i 5.039681556526045 6.1139e-06 deg
node 303.3378186005886 6.9214e-05 deg
peri 230.8910748519247 7.0047e-05 deg
M 211.458726460251 1.2999e-05 deg
tp 2459895.458681550998
(2022-Nov-11.95868155)
6.4308e-05 TDB
period 1684.280196314669
4.61
1.5966e-05
4.371e-08
d
yr
n .2137411582631601 2.0261e-09 deg/d
Q 3.325102712070624 2.1013e-08 au
  Orbit Determination Parameters
   # obs. used (total)      366  
   data-arc span      6656 days (18.22 yr)  
   first obs. used      2002-10-16  
   last obs. used      2021-01-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .63962  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 23:44:55  

Additional Information
 Earth MOID = 1.22478 au 
 Jupiter MOID = 1.68073 au 
 T_jup = 3.302 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457872.5 (2017-Apr-29.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1986450706429342 7.1903e-08  
q 2.221760804742785 1.9494e-07 au
tp 2458211.706782512337
(2018-Apr-03.20678251)
5.7254e-05 TDB
node 303.403866454137 6.932e-05 deg
peri 231.1447428737444 7.017e-05 deg
i 5.033346550449618 6.1072e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      366  
   data-arc span      6656 days (18.22 yr)  
   first obs. used      2002-10-16  
   last obs. used      2021-01-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .63962  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 23:44:55  

Additional Information
 Jupiter MOID = 1.68073 au 
 T_jup = 3.302 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.170024032047536E-15 -1.398419039251552E-14 -3.983490357010936E-13 4.102578795891179E-14 -8.002584027833676E-14 4.511539528108474E-15
q -1.398419039251552E-14 3.800237835345992E-14 1.378515457932867E-12 -1.097518842919084E-13 2.5850588590078E-13 -1.237447167293277E-14
tp -3.983490357010936E-13 1.378515457932867E-12 3.278051714091946E-9 -6.229454318828514E-12 6.762829815244665E-10 6.421436073455582E-13
node 4.102578795891179E-14 -1.097518842919084E-13 -6.229454318828514E-12 4.805272469785408E-9 -4.787098019894044E-9 1.857898381090168E-10
peri -8.002584027833676E-14 2.5850588590078E-13 6.762829815244665E-10 -4.787098019894044E-9 4.923870940602809E-9 -1.849429523792127E-10
i 4.511539528108474E-15 -1.237447167293277E-14 6.421436073455582E-13 1.857898381090168E-10 -1.849429523792127E-10 3.729776019599066E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.93   n/a MPCxxxxx  
rotation period rot_per 4.61 h n/a LCDB (Rev. 2020-October); 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:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]

213991 (2004 BK42)          Discovered 2004-Jan-21 by LINEAR at Socorro
Reference: 20090509/Numbers.arcLast Updated: 2009-05-11

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