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12801 Somekawa (1995 XD)
Classification: Main-belt Asteroid          SPK-ID: 2012801
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1238091287185311 5.6792e-08  
a 2.470175199894958 1.1085e-08 au
q 2.16434496061384 1.3715e-07 au
i 7.343031568973573 4.6417e-06 deg
node 63.79884632474555 3.2689e-05 deg
peri 351.2771716901117 4.31e-05 deg
M 35.89851604996161 2.3772e-05 deg
tp 2458459.095230498106
(2018-Dec-06.59523050)
9.4052e-05 TDB
period 1418.045162363645
3.88
9.545e-06
2.613e-08
d
yr
n .2538706167862384 1.7088e-09 deg/d
Q 2.776005439176076 1.2457e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1671  
   data-arc span      12960 days (35.48 yr)  
   first obs. used      1983-10-30  
   last obs. used      2019-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49191  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 19:19:14  

Additional Information
 Earth MOID = 1.17601 au 
 Jupiter MOID = 2.55107 au 
 T_jup = 3.463 
[ 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 14.4   n/a MPO365403  
diameter diameter 2.698 km 0.494 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.556   0.230 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12801 Somekawa           Discovered 1995 Dec. 2 by T. Kobayashi at Oizumi.
Somekawa Shuichi (1962-1997) was a Japanese amateur astronomer and optical engineer. The name was suggested by M. Namiki.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001111/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1995 XD = 1983 UD1 = 1987 WK4 = 1987 XB = 1991 TP13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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