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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4834426616640944 2.8623e-08  
a 1.853128790924218 3.6127e-09 au
q .9572472758334487 5.3074e-08 au
i 9.143091462283174 5.1801e-06 deg
node 19.90227833058979 2.4309e-05 deg
peri 197.6448773846741 2.4589e-05 deg
M 215.2635656998086 8.5396e-06 deg
tp 2459570.952219001215
(2021-Dec-22.45221900)
2.2916e-05 TDB
period 921.4182972328539
2.52
2.6945e-06
7.377e-09
d
yr
n .3907020308595234 1.1425e-09 deg/d
Q 2.749010306014986 5.3593e-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 = .0234322 au 
 Jupiter MOID = 2.23512 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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