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21237 Suematsu (1995 WF5)
Classification: Main-belt Asteroid          SPK-ID: 2021237
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1532236134207005 2.7274e-08  
a 2.646260524427793 1.0481e-08 au
q 2.240790924822409 7.3222e-08 au
i 4.388519221662544 3.6455e-06 deg
node 149.415365357172 3.985e-05 deg
peri 289.1502470833415 4.2052e-05 deg
M 278.6533298004719 1.4851e-05 deg
tp 2459555.791325265438
(2021-Dec-07.29132527)
6.5948e-05 TDB
period 1572.343118431658
4.30
9.3416e-06
2.558e-08
d
yr
n .2289576592920023 1.3603e-09 deg/d
Q 3.051730124033178 1.2087e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1868  
   data-arc span      10566 days (28.93 yr)  
   first obs. used      1991-12-30  
   last obs. used      2020-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49259  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:51:32  

Additional Information
 Earth MOID = 1.26055 au 
 Jupiter MOID = 2.19721 au 
 T_jup = 3.372 
[ 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 14.03   n/a E2021B10  
diameter diameter 4.805 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.278   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21237 Suematsu           Discovered 1995 Nov. 18 by K. Endate and K. Watanabe at Kitami.
Kenji Suematsu (b. 1966) teaches physics and earth sciences as a high school teacher in Nagasaki Prefecture. He is an enthusiastic teacher for students of all grades, from elementary through high school, and shows a particular passion for lectures on astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2018-10-26Last Updated: 2019-04-09

[ show close-approach data ]
Alternate Designations
 1995 WF5 = 1991 YR 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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