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49389 (1998 XS20)
Classification: Main-belt Asteroid          SPK-ID: 2049389
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2498840980938622 3.7379e-08  
a 2.745899311102205 1.2475e-08 au
q 2.059742738290873 1.0071e-07 au
i 15.83421787117469 4.2745e-06 deg
node 289.9661544202993 1.9097e-05 deg
peri 338.7671708358226 2.1879e-05 deg
M 114.1352739499798 1.1856e-05 deg
tp 2458473.582377172246
(2018-Dec-21.08237717)
5.3153e-05 TDB
period 1661.978261874798
4.55
1.1325e-05
3.101e-08
d
yr
n .2166093313362001 1.4761e-09 deg/d
Q 3.432055883913537 1.5592e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1914  
   data-arc span      8022 days (21.96 yr)  
   first obs. used      1998-11-14  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44618  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:32:55  

Additional Information
 Earth MOID = 1.05077 au 
 Jupiter MOID = 1.75763 au 
 T_jup = 3.248 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.0   n/a MPO502485  
diameter diameter 6.624 km 0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.138 h n/a LCDB (Rev. 2019-August); 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 0.306   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49389 (1998 XS20)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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