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JPL Small-Body Database Browser
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9738 (1987 DF6)
Classification: Main-belt Asteroid          SPK-ID: 2009738
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1225371492573291 4.0563e-08  
a 2.665997362646181 1.4044e-08 au
q 2.339313645899961 1.0583e-07 au
i 12.519006993678 5.0336e-06 deg
node 329.8904795721616 1.9529e-05 deg
peri 249.8525849116191 2.8237e-05 deg
M 87.51623142969829 2.1735e-05 deg
tp 2458213.978098539251
(2018-Apr-05.47809854)
9.5574e-05 TDB
period 1589.966595369764
4.35
1.2564e-05
3.44e-08
d
yr
n .2264198512398797 1.7892e-09 deg/d
Q 2.992681079392402 1.5765e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1847  
   data-arc span      14322 days (39.21 yr)  
   first obs. used      1980-09-13  
   last obs. used      2019-11-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43947  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 22:55:10  

Additional Information
 Earth MOID = 1.36822 au 
 Jupiter MOID = 2.11103 au 
 T_jup = 3.339 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.0   n/a MPO435792  
diameter diameter 6.473 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.165 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.320   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9738 (1987 DF6)          Discovered 1987-Feb-23 by Debehogne, H. at La Silla
Reference: 19981208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1987 DF6 = 1980 RR7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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