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249989 (2001 XS8)
Classification: Main-belt Asteroid          SPK-ID: 2249989
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2193691053269614 4.7136e-08  
a 2.77143636304142 1.3223e-08 au
q 2.163468847610416 1.3363e-07 au
i 11.79500016062998 4.7526e-06 deg
node 284.3207463942816 2.7153e-05 deg
peri 95.29432595605985 3.0954e-05 deg
M 38.12231083628065 1.21e-05 deg
tp 2458822.043442684775
(2019-Dec-04.54344268)
5.6461e-05 TDB
period 1685.216851344177
4.61
1.2061e-05
3.302e-08
d
yr
n .2136223594683697 1.5288e-09 deg/d
Q 3.379403878472425 1.6124e-08 au
  Orbit Determination Parameters
   # obs. used (total)      505  
   data-arc span      6658 days (18.23 yr)  
   first obs. used      2001-11-11  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52607  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 10:28:44  

Additional Information
 Earth MOID = 1.20427 au 
 Jupiter MOID = 2.28051 au 
 T_jup = 3.271 
[ 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 15.7   n/a MPO454854  
diameter diameter 1.708 km 0.262 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.382   0.166 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249989 (2001 XS8)          Discovered 2001-Dec-09 by LINEAR at Socorro
Reference: 20100923/Numbers.arcLast Updated: 2010-09-27
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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