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JPL Small-Body Database Browser
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20447 (1999 JR85)
Classification: Main-belt Asteroid          SPK-ID: 2020447
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3120939352664725 4.743e-08  
a 2.606951741576804 1.3832e-08 au
q 1.793337913498315 1.2569e-07 au
i 11.35707707572963 5.4189e-06 deg
node 194.9026474151488 2.3818e-05 deg
peri 118.3626045498893 2.5071e-05 deg
M 229.6690172591451 6.2668e-06 deg
tp 2459157.099848574367
(2020-Nov-03.59984857)
2.7911e-05 TDB
period 1537.439074522993
4.21
1.2236e-05
3.35e-08
d
yr
n .2341556201904742 1.8636e-09 deg/d
Q 3.420565569655293 1.8149e-08 au
  Orbit Determination Parameters
   # obs. used (total)      984  
   data-arc span      14884 days (40.75 yr)  
   first obs. used      1978-07-10  
   last obs. used      2019-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54247  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:41:10  

Additional Information
 Earth MOID = .812166 au 
 Jupiter MOID = 2.05726 au 
 T_jup = 3.315 
[ 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 14.1   n/a MPO384929  
diameter diameter 8.016 km 0.306 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.925 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:
[Durkee, R.I. (2018) Minor Planet Bull. 45, 333-335.]
geometric albedo albedo 0.063   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20447 (1999 JR85)          Discovered 1999-May-15 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 JR85 = 1978 NE3 = 1982 JS4 = 1991 TQ12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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