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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08532123113669715 4.52e-08  
a 3.173158291419677 2.509e-08 au
q 2.902420519404132 1.4513e-07 au
i 9.473231446765991 4.4696e-06 deg
node 61.0395838343258 3.078e-05 deg
peri 320.0137174291637 4.1896e-05 deg
M 321.2993640944018 2.746e-05 deg
tp 2459222.448202967055
(2021-Jan-07.94820297)
0.00015761 TDB
period 2064.600521372359
5.65
2.4487e-05
6.704e-08
d
yr
n .1743678722703725 2.0681e-09 deg/d
Q 3.443896063435222 2.723e-08 au
  Orbit Determination Parameters
   # obs. used (total)      572  
   data-arc span      7978 days (21.84 yr)  
   first obs. used      1998-11-18  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56726  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 20:16:10  

Additional Information
 Earth MOID = 1.91416 au 
 Jupiter MOID = 1.99891 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 14.8   n/a MPO432709  
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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