Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 
[ 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. 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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-08 16:37 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin