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4973 Showa (1990 FT)
Classification: Outer Main-belt Asteroid          SPK-ID: 2004973
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07655810218446672 3.8381e-08  
a 3.430270286838149 2.2949e-08 au
q 3.167655303698055 1.3772e-07 au
i 18.91634116738393 3.972e-06 deg
node 352.8177886680239 1.0821e-05 deg
peri 130.5930034521415 3.2532e-05 deg
M 357.1729277140481 2.7674e-05 deg
tp 2459218.723229787414
(2021-Jan-04.22322979)
0.00017833 TDB
period 2320.550046091168
6.35
2.3287e-05
6.376e-08
d
yr
n .1551356328670434 1.5568e-09 deg/d
Q 3.692885269978245 2.4706e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2438  
   data-arc span      18259 days (49.99 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37964  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:58:50  

Additional Information
 Earth MOID = 2.21179 au 
 Jupiter MOID = 1.36572 au 
 T_jup = 3.049 
[ 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 11.64   n/a MPCxxxxx  
diameter diameter 27.958 km 0.423 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.068   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4973 Showa (1990 FT)          Discovered 1990-Mar-18 by Endate and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1990 FT = 1978 CF = 1981 WK7 = 1987 SH14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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