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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .005963548818132141 3.5777e-08  
a 2.701413855900638 1.136e-08 au
q 2.685303842492996 9.6332e-08 au
i 1.243743557563989 4.0027e-06 deg
node 213.3049090774259 0.00017977 deg
peri 277.8115979175186 0.00038554 deg
M 126.1646425368725 0.00034066 deg
tp 2458432.144231406995
(2018-Nov-09.64423141)
0.0015346 TDB
period 1621.754499353365
4.44
1.023e-05
2.801e-08
d
yr
n .2219818105289926 1.4002e-09 deg/d
Q 2.717523869308281 1.1428e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2190  
   data-arc span      10913 days (29.88 yr)  
   first obs. used      1990-09-20  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48036  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:25:12  

Additional Information
 Earth MOID = 1.69329 au 
 Jupiter MOID = 2.24825 au 
 T_jup = 3.367 
[ 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

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