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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2191888096084563 4.7197e-08  
a 2.771020964642587 1.331e-08 au
q 2.163644178002502 1.3374e-07 au
i 11.79470914687401 4.7593e-06 deg
node 284.3209267110723 2.7174e-05 deg
peri 95.25243231992634 3.098e-05 deg
M 312.6887037086528 1.2045e-05 deg
tp 2458821.921858108344
(2019-Dec-04.42185811)
5.6563e-05 TDB
period 1684.83798093654
4.61
1.2139e-05
3.323e-08
d
yr
n .2136703968412969 1.5395e-09 deg/d
Q 3.378397751282671 1.6228e-08 au
  Orbit Determination Parameters
   # obs. used (total)      502  
   data-arc span      6588 days (18.04 yr)  
   first obs. used      2001-11-11  
   last obs. used      2019-11-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53007  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 18:49:49  

Additional Information
 Earth MOID = 1.20372 au 
 Jupiter MOID = 2.27945 au 
 T_jup = 3.272 
[ 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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