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120987 (1998 XA18)
Classification: Main-belt Asteroid          SPK-ID: 2120987
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08518299957153783 4.4249e-08  
a 3.172391695887983 2.1928e-08 au
q 2.902157855416407 1.4389e-07 au
i 9.473510529581093 3.9627e-06 deg
node 61.03470871499086 2.9418e-05 deg
peri 320.1825975965656 4.0193e-05 deg
M 356.0332628000413 2.5431e-05 deg
tp 2459223.241000183570
(2021-Jan-08.74100018)
0.00014576 TDB
period 2063.852393894504
5.65
2.1399e-05
5.859e-08
d
yr
n .1744310790175636 1.8086e-09 deg/d
Q 3.44262553635956 2.3796e-08 au
  Orbit Determination Parameters
   # obs. used (total)      712  
   data-arc span      8090 days (22.15 yr)  
   first obs. used      1998-11-18  
   last obs. used      2021-01-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55794  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:09:03  

Additional Information
 Earth MOID = 1.91263 au 
 Jupiter MOID = 2.00049 au 
 T_jup = 3.175 
[ 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 14.92   n/a E2021B55  
diameter diameter 7.090 km 0.232 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.046   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

120987 (1998 XA18)          Discovered 1998-Dec-08 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

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