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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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .005963546601075605 3.6052e-08  
a 2.701413856894296 1.1508e-08 au
q 2.685303849469915 9.732e-08 au
i 1.243743520283834 4.0532e-06 deg
node 213.3049108906291 0.00018112 deg
peri 277.811569482255 0.00038964 deg
M 126.1646686473236 0.00034442 deg
tp 2458432.144113469126
(2018-Nov-09.64411347)
0.0015516 TDB
period 1621.754500248157
4.44
1.0363e-05
2.837e-08
d
yr
n .2219818104065157 1.4185e-09 deg/d
Q 2.717523864318676 1.1577e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2139  
   data-arc span      10863 days (29.74 yr)  
   first obs. used      1990-09-20  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4845  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:29:34  

Additional Information
 Earth MOID = 1.69329 au 
 Jupiter MOID = 2.24825 au 
 T_jup = 3.367 
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Orbital Elements at Epoch 2456495.5 (2013-Jul-22.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008047785260412587 3.629e-08  
q 2.67928579454018 9.8755e-08 au
tp 2456837.554958604396
(2014-Jun-29.05495860)
0.0011385 TDB
node 213.4919063738153 0.00018101 deg
peri 283.5783425875993 0.00031133 deg
i 1.243868174958667 4.0546e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2139  
   data-arc span      10863 days (29.74 yr)  
   first obs. used      1990-09-20  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4845  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:29:34  

Additional Information
 Jupiter MOID = 2.24825 au 
 T_jup = 3.367 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.316965479539551E-15 -3.558841093553616E-15 4.750427014082729E-12 -5.796722787561395E-15 1.04409231611096E-12 -8.633941349810036E-17
q -3.558841093553616E-15 9.752500585028444E-15 -1.356428082599909E-11 1.559858171518006E-14 -2.991735162700661E-12 2.605759220378382E-16
tp 4.750427014082729E-12 -1.356428082599909E-11 1.296149370606883E-6 -1.299825122584225E-10 2.883992456511083E-7 -3.963409776168233E-12
node -5.796722787561395E-15 1.559858171518006E-14 -1.299825122584225E-10 3.276495358701958E-8 -3.278558423520922E-8 -8.763975591747724E-11
peri 1.04409231611096E-12 -2.991735162700661E-12 2.883992456511083E-7 -3.278558423520922E-8 9.692767075110721E-8 8.673489711737572E-11
i -8.633941349810036E-17 2.605759220378382E-16 -3.963409776168233E-12 -8.763975591747724E-11 8.673489711737572E-11 1.643951859060777E-11

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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