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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
0.0015516 TDB
period 1621.754500248157
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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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] (  
geometric albedo albedo 0.145   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1976-Feb-25 12:50 00:01 Iris 0.0125033946220326 0.0125011889788575 0.0125056013059602 3.90406449589377 3.90406437812555 2442834.034484218 1.27016606732148 225.377523624512 44.6482902732031 -62.9445114264365 37476.2099200445 T 25 CATAB v2.0f-lin.ifort 2020-Jun-23 18:29:46 2020-Jun-23 18:29

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