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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4833453381686398 2.8616e-08  
a 1.853326022881171 3.6136e-09 au
q .957529529614931 5.3073e-08 au
i 9.142441381298992 5.1799e-06 deg
node 19.89757856950405 2.431e-05 deg
peri 197.6380258299329 2.4591e-05 deg
M 291.8455889105926 8.7591e-06 deg
tp 2459570.968742665036
(2021-Dec-22.46874266)
2.2921e-05 TDB
period 921.565403551332
2.52
2.6953e-06
7.379e-09
d
yr
n .3906396644369557 1.1425e-09 deg/d
Q 2.749122516147411 5.3603e-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49451  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:15:55  

Additional Information
 Earth MOID = .0222149 au 
 Jupiter MOID = 2.23386 au 
 T_jup = 3.839 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455468.5 (2010-Sep-29.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4839578585148316 2.8789e-08  
q .9560030605538949 5.3547e-08 au
tp 2455885.613773560631
(2011-Nov-20.11377356)
1.2313e-05 TDB
node 19.97177269921136 2.4273e-05 deg
peri 197.5674333513052 2.4547e-05 deg
i 9.154134685761065 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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49451  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:15:55  

Additional Information
 Jupiter MOID = 2.23386 au 
 T_jup = 3.839 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.287959004310295E-16 -1.540533440171218E-15 1.150700247880344E-14 2.259179813679689E-14 1.163424452779303E-13 -8.608350693423129E-15
q -1.540533440171218E-15 2.867310520190343E-15 -1.191355764510897E-17 -3.8920384539411E-14 -2.146554165912123E-13 1.690537398482647E-14
tp 1.150700247880344E-14 -1.191355764510897E-17 1.516003137009256E-10 4.07431333177569E-11 2.471934948054199E-11 5.696500204198315E-12
node 2.259179813679689E-14 -3.8920384539411E-14 4.07431333177569E-11 5.89161974778875E-10 -5.593415484172226E-10 -6.951350656346648E-11
peri 1.163424452779303E-13 -2.146554165912123E-13 2.471934948054199E-11 -5.593415484172226E-10 6.025464486287278E-10 6.914149876130244E-11
i -8.608350693423129E-15 1.690537398482647E-14 5.696500204198315E-12 -6.951350656346648E-11 6.914149876130244E-11 2.688595505406418E-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. 2020-October); 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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