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18540 (1996 XK31)
Classification: Main-belt Asteroid          SPK-ID: 2018540
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2518672310280937 3.0124e-08  
a 2.678177302457253 1.0226e-08 au
q 2.003632201085055 8.0119e-08 au
i 3.088098149017559 4.3952e-06 deg
node 162.3899822303565 6.454e-05 deg
peri 248.0583268084629 6.5185e-05 deg
M 202.5196259841672 1.0042e-05 deg
tp 2459900.795525227136
(2022-Nov-17.29552523)
4.7002e-05 TDB
period 1600.874970340258
4.38
9.1691e-06
2.51e-08
d
yr
n .2248770245458231 1.288e-09 deg/d
Q 3.352722403829451 1.2802e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1255  
   data-arc span      10484 days (28.70 yr)  
   first obs. used      1991-09-11  
   last obs. used      2020-05-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53292  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:20  

Additional Information
 Earth MOID = 1.01577 au 
 Jupiter MOID = 2.04265 au 
 T_jup = 3.329 
[ 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 14.78   n/a E2021B10  
diameter diameter 4.768 km 0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.123   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18540 (1996 XK31)          Discovered 1996-Dec-14 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1996 XK31 = 1991 RZ33 = 2000 QP131 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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