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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1531820807488994 2.7096e-08  
a 2.645279696573038 1.0288e-08 au
q 2.240070248489163 7.277e-08 au
i 4.388963381729694 3.5678e-06 deg
node 149.4180551525793 3.9828e-05 deg
peri 289.2864344930109 4.1983e-05 deg
M 323.412219433057 1.4899e-05 deg
tp 2459556.212677235911
(2021-Dec-07.71267724)
6.5521e-05 TDB
period 1571.469023646546
4.30
9.1672e-06
2.51e-08
d
yr
n .2290850119111039 1.3364e-09 deg/d
Q 3.050489144656913 1.1863e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1885  
   data-arc span      10566 days (28.93 yr)  
   first obs. used      1991-12-30  
   last obs. used      2020-12-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49076  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:42:06  

Additional Information
 Earth MOID = 1.26015 au 
 Jupiter MOID = 2.19818 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 14.04   n/a MPCxxxxx  
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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