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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1827904847358648 4.8841e-08  
a 2.584807279035974 1.2551e-08 au
q 2.112329103552196 1.2852e-07 au
i 13.52643368765716 3.5558e-06 deg
node 134.8314807517866 2.2337e-05 deg
peri 260.3025464276598 2.3786e-05 deg
M 211.2323509327322 1.0244e-05 deg
tp 2459227.758677654941
(2021-Jan-13.25867765)
4.4922e-05 TDB
period 1517.891324972632
4.16
1.1056e-05
3.027e-08
d
yr
n .2371711294986753 1.7275e-09 deg/d
Q 3.057285454519751 1.4845e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1668  
   data-arc span      8233 days (22.54 yr)  
   first obs. used      1997-03-04  
   last obs. used      2019-09-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45358  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:29:56  

Additional Information
 Earth MOID = 1.16594 au 
 Jupiter MOID = 2.52136 au 
 T_jup = 3.360 
[ 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 13.1   n/a MPO384930  
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. 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:
[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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