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20485 (1999 NJ54)
Classification: Main-belt Asteroid          SPK-ID: 2020485
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1742552365821411 4.1043e-08  
a 2.663742228284375 1.2548e-08 au
q 2.199571196100842 1.1014e-07 au
i 13.25624051820683 4.44e-06 deg
node 205.612396251675 1.5256e-05 deg
peri 196.1229077618985 1.7732e-05 deg
M 220.4070538856093 1.018e-05 deg
tp 2459616.240461267645
(2022-Feb-05.74046127)
4.6673e-05 TDB
period 1587.949622287543
4.35
1.1221e-05
3.072e-08
d
yr
n .2267074439561861 1.602e-09 deg/d
Q 3.127913260467909 1.4735e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1341  
   data-arc span      10001 days (27.38 yr)  
   first obs. used      1993-04-17  
   last obs. used      2020-09-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49814  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:02:34  

Additional Information
 Earth MOID = 1.20998 au 
 Jupiter MOID = 2.30533 au 
 T_jup = 3.325 
[ 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 MPO337431  
diameter diameter 4.338 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.259   0.062 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20485 (1999 NJ54)          Discovered 1999-Jul-12 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 NJ54 = 1996 CN = 1998 HV150 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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