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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 ]

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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 
[ show covariance matrix ]

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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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