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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456529.5 (2013-Aug-25.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .00805512079189807 3.5901e-08  
q 2.679601082612026 9.7453e-08 au
tp 2456833.496261219791
(2014-Jun-24.99626122)
0.001129 TDB
node 213.4894037911007 0.00017968 deg
peri 282.6626208457187 0.00030874 deg
i 1.243776719825421 4.0038e-06 deg
  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
 Jupiter MOID = 2.24825 au 
 T_jup = 3.367 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.288871717754599E-15 -3.474336096636325E-15 4.035767632604856E-12 -5.909444184421792E-15 8.828679556981483E-13 -7.140307705381203E-17
q -3.474336096636325E-15 9.497057752555384E-15 -1.132320822321014E-11 1.603675493452526E-14 -2.486302673522896E-12 2.146651676323671E-16
tp 4.035767632604856E-12 -1.132320822321014E-11 1.274655896838591E-6 -1.098162989713155E-10 2.834694565783711E-7 -4.474321461882304E-12
node -5.909444184421792E-15 1.603675493452526E-14 -1.098162989713155E-10 3.228565600154647E-8 -3.230190053490258E-8 -7.363513916485172E-11
peri 8.828679556981483E-13 -2.486302673522896E-12 2.834694565783711E-7 -3.230190053490258E-8 9.531872340976796E-8 7.262024511051161E-11
i -7.140307705381203E-17 2.146651676323671E-16 -4.474321461882304E-12 -7.363513916485172E-11 7.262024511051161E-11 1.603079684223294E-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

[ 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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