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29157 Higashinihon (1989 ET1)
Classification: Main-belt Asteroid          SPK-ID: 2029157
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1069539630895011 3.292e-08  
a 2.293998820774897 6.9096e-09 au
q 2.04864655557038 7.6119e-08 au
i 6.232138340411822 3.7811e-06 deg
node 36.95053528590724 3.3753e-05 deg
peri 87.63606181224945 3.9343e-05 deg
M 88.35355724972912 1.8388e-05 deg
tp 2458889.034641402179
(2020-Feb-09.53464140)
6.5035e-05 TDB
period 1269.077698572905
3.47
5.7337e-06
1.57e-08
d
yr
n .2836705746266165 1.2816e-09 deg/d
Q 2.539351085979415 7.6486e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2041  
   data-arc span      25771 days (70.56 yr)  
   first obs. used      1949-11-21  
   last obs. used      2020-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46762  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:07:11  

Additional Information
 Earth MOID = 1.07518 au 
 Jupiter MOID = 2.51675 au 
 T_jup = 3.581 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.46   n/a E2021B10  
diameter diameter 3.188 km 0.282 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.398   0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

29157 Higashinihon           Discovered 1989 Mar. 11 by T. Seki at Geisei.
"Higashi Nihon" (East Japan) was struck by one of the most destructive earthquakes in history on 2011 Mar. 11. The whole nation has risen to the task of reconstruction with the spirit of "Ganbarou" ("do your best and don't give up"). Coincidentally, this minor planet was discovered on Mar. 11.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120703/MPCPages.arcLast Updated: 2012-07-09

Alternate Designations
 1989 ET1 = 1984 WM3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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