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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .005963549964255467 3.5503e-08  
a 2.701413855400641 1.1195e-08 au
q 2.685303838899827 9.5329e-08 au
i 1.24374417776701 3.9267e-06 deg
node 213.3048926362003 0.00017855 deg
peri 277.8116295357273 0.00038069 deg
M 126.1646276322341 0.00033601 deg
tp 2458432.144298708300
(2018-Nov-09.64429871)
0.0015136 TDB
period 1621.754498903116
4.44
1.0082e-05
2.76e-08
d
yr
n .2219818105906217 1.3799e-09 deg/d
Q 2.717523871901455 1.1262e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2222  
   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      .47825  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:10:36  

Additional Information
 Earth MOID = 1.69329 au 
 Jupiter MOID = 2.24825 au 
 T_jup = 3.367 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456595.5 (2013-Oct-30.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .008095554039688162 3.5482e-08  
q 2.680195084528146 9.6059e-08 au
tp 2456824.683444276435
(2014-Jun-16.18344428)
0.0011133 TDB
node 213.4777815334923 0.00017852 deg
peri 280.6827486690185 0.00030506 deg
i 1.243502374501918 3.9271e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2222  
   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      .47825  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:10:36  

Additional Information
 Jupiter MOID = 2.24825 au 
 T_jup = 3.367 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.258983457732726E-15 -3.384793121688207E-15 3.26207794254029E-12 -5.972113003703209E-15 7.082136678592934E-13 -5.041146968536525E-17
q -3.384793121688207E-15 9.227266411384981E-15 -8.828112911536953E-12 1.646265585926794E-14 -1.923642777690296E-12 1.407682344426115E-16
tp 3.26207794254029E-12 -8.828112911536953E-12 1.23945348646298E-6 -9.828689952252843E-11 2.754213139676471E-7 -4.909889939905379E-12
node -5.972113003703209E-15 1.646265585926794E-14 -9.828689952252843E-11 3.186960697714627E-8 -3.188338061532935E-8 -5.751916272678895E-11
peri 7.082136678592934E-13 -1.923642777690296E-12 2.754213139676471E-7 -3.188338061532935E-8 9.306406922278572E-8 5.641192131494595E-11
i -5.041146968536525E-17 1.407682344426115E-16 -4.909889939905379E-12 -5.751916272678895E-11 5.641192131494595E-11 1.542228287655853E-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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