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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3123357393173612 4.047e-08  
a 2.607598451173028 1.1355e-08 au
q 1.793152261083095 1.1077e-07 au
i 11.35722952306731 3.3601e-06 deg
node 194.8807047317657 1.8696e-05 deg
peri 118.3136133825085 2.0556e-05 deg
M 10.21594375816989 5.5911e-06 deg
tp 2459156.854900183708
(2020-Nov-03.35490018)
2.3854e-05 TDB
period 1538.011201490787
4.21
1.0046e-05
2.75e-08
d
yr
n .2340685163092789 1.5289e-09 deg/d
Q 3.422044641262961 1.4902e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1520  
   data-arc span      15506 days (42.45 yr)  
   first obs. used      1978-07-10  
   last obs. used      2020-12-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47692  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:17  

Additional Information
 Earth MOID = .811 au 
 Jupiter MOID = 2.05857 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 14.20   n/a E2021B10  
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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