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120988 (1998 XM18)
Classification: Main-belt Asteroid          SPK-ID: 2120988
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .14295577718862 3.8877e-08  
a 3.169229454650477 2.5041e-08 au
q 2.716169794871851 1.337e-07 au
i .6647617225933216 4.243e-06 deg
node 119.4918653660253 0.00043411 deg
peri 339.8624729539987 0.00043457 deg
M 289.4675160373249 2.0249e-05 deg
tp 2459604.252877265468
(2022-Jan-24.75287727)
0.00011791 TDB
period 2060.767289756681
5.64
2.4424e-05
6.687e-08
d
yr
n .1746922138125096 2.0705e-09 deg/d
Q 3.622289114429103 2.8621e-08 au
  Orbit Determination Parameters
   # obs. used (total)      615  
   data-arc span      8035 days (22.00 yr)  
   first obs. used      1998-12-08  
   last obs. used      2020-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55201  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:26:21  

Additional Information
 Earth MOID = 1.73286 au 
 Jupiter MOID = 1.5361 au 
 T_jup = 3.187 
[ 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 15.57   n/a E2021B55  
diameter diameter 3.476 km 0.500 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.092   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

120988 (1998 XM18)          Discovered 1998-Dec-08 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 XM18 = 2000 EB138 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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