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20473 (1999 NS8)
Classification: Main-belt Asteroid          SPK-ID: 2020473
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1816700131533025 2.3707e-08  
a 2.583228268971849 9.4002e-09 au
q 2.113933155369751 6.3422e-08 au
i 13.54250846449934 2.337e-07 deg
node 134.7601340162758 2.1937e-06 deg
peri 260.6427729001221 4.1401e-06 deg
M 353.1937136491006 4.4185e-06 deg
tp 2459229.171493742579
(2021-Jan-14.67149374)
1.8625e-05 TDB
period 1516.500660593633
4.15
8.2776e-06
2.266e-08
d
yr
n .2373886206281494 1.2958e-09 deg/d
Q 3.052523382573948 1.1108e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2411  
   data-arc span      8767 days (24.00 yr)  
   first obs. used      1997-03-04  
   last obs. used      2021-03-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42309  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:21:58  

Additional Information
 Earth MOID = 1.16738 au 
 Jupiter MOID = 2.52463 au 
 T_jup = 3.361 
[ 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 13.21   n/a E2021B10  
diameter diameter 6.299 km 0.142 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 21.958 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.281   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20473 (1999 NS8)          Discovered 1999-Jul-13 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 NS8 = 1997 EK34 = 1998 HA124 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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