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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3123454879192303 4.0858e-08  
a 2.607471597887156 1.1321e-08 au
q 1.793039609409558 1.1179e-07 au
i 11.35687733846 3.3927e-06 deg
node 194.8980216516502 1.8876e-05 deg
peri 118.3406532628589 2.0824e-05 deg
M 323.3773407725429 5.657e-06 deg
tp 2459156.949861062887
(2020-Nov-03.44986106)
2.4236e-05 TDB
period 1537.898972131794
4.21
1.0016e-05
2.742e-08
d
yr
n .2340855976390814 1.5245e-09 deg/d
Q 3.421903586364755 1.4857e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1474  
   data-arc span      15465 days (42.34 yr)  
   first obs. used      1978-07-10  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47707  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:13:50  

Additional Information
 Earth MOID = .812707 au 
 Jupiter MOID = 2.05882 au 
 T_jup = 3.314 
[ 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. 2020-October); 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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