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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1238331128006111 5.5902e-08  
a 2.469480053912779 9.4366e-09 au
q 2.163676651837739 1.3573e-07 au
i 7.343001329206523 4.2764e-06 deg
node 63.79385996350116 3.2416e-05 deg
peri 351.1394009801428 3.987e-05 deg
M 137.6120364077043 2.041e-05 deg
tp 2458458.673013627569
(2018-Dec-06.17301363)
8.1043e-05 TDB
period 1417.446614307603
3.88
8.1247e-06
2.224e-08
d
yr
n .2539778192463732 1.4558e-09 deg/d
Q 2.77528345598782 1.0605e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1884  
   data-arc span      13357 days (36.57 yr)  
   first obs. used      1983-10-30  
   last obs. used      2020-05-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48142  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:50:33  

Additional Information
 Earth MOID = 1.17573 au 
 Jupiter MOID = 2.55221 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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