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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07650379504994113 4.4938e-08  
a 3.428500131091236 2.9023e-08 au
q 3.166206859733536 1.5602e-07 au
i 18.91852987228117 6.5146e-06 deg
node 352.8394085135238 1.2667e-05 deg
peri 131.0099010082339 3.9651e-05 deg
M 263.6528220195988 3.7582e-05 deg
tp 2459221.070576637117
(2021-Jan-06.57057664)
0.00024381 TDB
period 2318.754033821385
6.35
2.9443e-05
8.061e-08
d
yr
n .1552557945987518 1.9714e-09 deg/d
Q 3.690793402448936 3.1243e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1626  
   data-arc span      17750 days (48.60 yr)  
   first obs. used      1971-03-24  
   last obs. used      2019-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44216  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:41:28  

Additional Information
 Earth MOID = 2.21035 au 
 Jupiter MOID = 1.36863 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 11.5   n/a MPO337294  
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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