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8274 Soejima (1990 TJ1)
Classification: Main-belt Asteroid          SPK-ID: 2008274
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2016598110711379 3.8346e-08  
a 2.273781708827154 7.7086e-09 au
q 1.815251319008061 8.7133e-08 au
i 3.729196566026972 3.355e-06 deg
node 76.70430019809581 6.1663e-05 deg
peri 314.649231099636 6.2149e-05 deg
M 228.6830067565585 8.6811e-06 deg
tp 2459457.314635079562
(2021-Aug-30.81463508)
3.1349e-05 TDB
period 1252.338060495881
3.43
6.3685e-06
1.744e-08
d
yr
n .287462316570857 1.4618e-09 deg/d
Q 2.732312098646247 9.2631e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1833  
   data-arc span      28204 days (77.22 yr)  
   first obs. used      1942-11-05  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50605  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:50:28  

Additional Information
 Earth MOID = .823496 au 
 Jupiter MOID = 2.70577 au 
 T_jup = 3.581 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456593.5 (2013-Oct-28.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .200758646967109 3.8178e-08  
q 1.817698679685908 8.6616e-08 au
tp 2456952.464267018769
(2014-Oct-21.96426702)
2.743e-05 TDB
node 76.77599011557943 6.1651e-05 deg
peri 314.560831618693 6.2148e-05 deg
i 3.729120573912605 3.3539e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1833  
   data-arc span      28204 days (77.22 yr)  
   first obs. used      1942-11-05  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50605  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:50:28  

Additional Information
 Jupiter MOID = 2.70577 au 
 T_jup = 3.581 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.457538551581255E-15 -3.298212350322237E-15 -2.097154452191311E-13 -1.193159855553272E-14 -8.58791485946845E-14 -1.437330065166607E-16
q -3.298212350322237E-15 7.502297858441257E-15 4.960906297974648E-13 2.680816798631503E-14 1.967230481911922E-13 3.318068586830597E-16
tp -2.097154452191311E-13 4.960906297974648E-13 7.523920674287418E-10 2.556396434798469E-12 2.308968858140527E-10 -2.930254715129413E-13
node -1.193159855553272E-14 2.680816798631503E-14 2.556396434798469E-12 3.800809399361009E-9 -3.791296088452495E-9 -4.095783910335159E-11
peri -8.58791485946845E-14 1.967230481911922E-13 2.308968858140527E-10 -3.791296088452495E-9 3.862330791243564E-9 4.078226967249232E-11
i -1.437330065166607E-16 3.318068586830597E-16 -2.930254715129413E-13 -4.095783910335159E-11 4.078226967249232E-11 1.124870766143331E-11

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 14.3   n/a MPO319189  
diameter diameter 3.391 km 0.296 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.268   0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

8274 Soejima           Discovered 1990 Oct. 15 by K. Endate and K. Watanabe at Kitami.
Named in honor of Tsutomu Soejima (b. 1950), a Japanese amateur astronomer and secretary of the Saga Astronomical Society since 1989. He is a board member of the astronomical society's observatory, the Tara Observatory and the Saga City Observatory. His main interests are comet hunting and photography. Name proposed by the discoverers following a suggestion by Y. Yamada.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

[ show close-approach data ]
Alternate Designations
 1990 TJ1 = 1942 VC = 1973 YS1 = 1997 XJ10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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