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19156 Heco (1990 SE4)
Classification: Main-belt Asteroid          SPK-ID: 2019156
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .005686104324721091 2.528e-08  
a 2.703091396729035 1.0815e-08 au
q 2.687721337047977 6.6363e-08 au
i 1.243094245355253 1.2105e-06 deg
node 213.215967692485 3.8541e-05 deg
peri 285.2467433657526 0.00015591 deg
M 163.1417178634087 0.00015049 deg
tp 2458464.882499601618
(2018-Dec-12.38249960)
0.00067717 TDB
period 1623.265364688274
4.44
9.742e-06
2.667e-08
d
yr
n .2217751994413637 1.331e-09 deg/d
Q 2.718461456410092 1.0877e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2259  
   data-arc span      10953 days (29.99 yr)  
   first obs. used      1990-09-20  
   last obs. used      2020-09-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47465  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 02:09:59  

Additional Information
 Earth MOID = 1.69206 au 
 Jupiter MOID = 2.24423 au 
 T_jup = 3.366 
[ 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 13.5   n/a MPO384918  
diameter diameter 5.797 km 0.233 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.145   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19156 Heco           Discovered 1990 Sept. 20 by T. Seki at Geisei.
Joseph Heco (Hikozo Hamada, 1837--1897) was born in Harima town, Hyogo prefecture. He survived a shipwreck in 1851, was taken to the US and became one of the first Japanese to become a US citizen. Returning to Japan, he published the first Japanese newspaper, while Japan was still closed to the outside world.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20121228/MPCPages.arcLast Updated: 2013-01-02

[ show close-approach data ]
Alternate Designations
 1990 SE4 = 1999 TK1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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