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JPL Small-Body Database Browser
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85938 (1999 DJ4)
Classification: Apollo [NEO, PHA]          SPK-ID: 2085938
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 119 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4835890689184552 2.8668e-08  
a 1.853048805398087 3.6708e-09 au
q .9569346589351703 5.3197e-08 au
i 9.144255046335418 5.1804e-06 deg
node 19.90873089845081 2.4305e-05 deg
peri 197.6572196531074 2.4584e-05 deg
M 340.7924877708643 7.8668e-06 deg
tp 2458649.658353838579
(2019-Jun-15.15835384)
2.0275e-05 TDB
period 921.3586419090761
2.52
2.7377e-06
7.495e-09
d
yr
n .3907273276930163 1.161e-09 deg/d
Q 2.749162951861003 5.4459e-09 au
  Orbit Determination Parameters
   # obs. used (total)      627  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      7395 days (20.25 yr)  
   first obs. used      1999-02-24  
   last obs. used      2019-05-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49445  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jun-01 06:34:52  

Additional Information
 Earth MOID = .0229298 au 
 Jupiter MOID = 2.23683 au 
 T_jup = 3.839 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455468.5 (2010-Sep-29.0) TDB
Reference: JPL 119 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4839578655232621 2.8789e-08  
q .9560030469834154 5.3547e-08 au
tp 2455885.613765303620
(2011-Nov-20.11376530)
1.2313e-05 TDB
node 19.97177877959873 2.4273e-05 deg
peri 197.5674220601001 2.4547e-05 deg
i 9.154128915619125 5.1852e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      627  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      7395 days (20.25 yr)  
   first obs. used      1999-02-24  
   last obs. used      2019-05-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49445  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jun-01 06:34:52  

Additional Information
 Jupiter MOID = 2.23683 au 
 T_jup = 3.839 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.287955924445658E-16 -1.540532871356744E-15 1.15069305149594E-14 2.259176323021618E-14 1.163424152013997E-13 -8.608347019524134E-15
q -1.540532871356744E-15 2.867309467730369E-15 -1.179021718449084E-17 -3.892033449495833E-14 -2.146553489526055E-13 1.690536905117243E-14
tp 1.15069305149594E-14 -1.179021718449084E-17 1.516002485148646E-10 4.074298390216943E-11 2.471946562320431E-11 5.69652159728404E-12
node 2.259176323021618E-14 -3.892033449495833E-14 4.074298390216943E-11 5.89162770452182E-10 -5.593423936581603E-10 -6.951356151018729E-11
peri 1.163424152013997E-13 -2.146553489526055E-13 2.471946562320431E-11 -5.593423936581603E-10 6.025473203505653E-10 6.914156011254021E-11
i -8.608347019524134E-15 1.690536905117243E-14 5.69652159728404E-12 -6.951356151018729E-11 6.914156011254021E-11 2.68859480047088E-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 18.6   n/a MPO186590  
rotation period rot_per 2.5141 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Pravec, P.; et al. (2004) IAUC 8316. (1999 DJ4)]
[Pravec, P.; et al. (2006) Icarus 181, 63-93.]
SMASSII spectral type spec_B Sq   n/a Binzel et al. (2001) Icarus 151, 139-149  

85938 (1999 DJ4)          Discovered 1999-Feb-24 by LINEAR at Socorro
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

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