Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
29157 Higashinihon (1989 ET1)
Classification: Main-belt Asteroid          SPK-ID: 2029157
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1070476040060992 3.3051e-08  
a 2.294318817977129 7.1102e-09 au
q 2.048717485686572 7.6501e-08 au
i 6.231815298023066 3.9861e-06 deg
node 36.95236248140808 3.3947e-05 deg
peri 87.69030415184837 3.969e-05 deg
M 31.56472625570749 1.9055e-05 deg
tp 2458889.204243914309
(2020-Feb-09.70424391)
6.7236e-05 TDB
period 1269.343249368556
3.48
5.9007e-06
1.616e-08
d
yr
n .2836112298065039 1.3184e-09 deg/d
Q 2.539920150267686 7.8714e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1801  
   data-arc span      25642 days (70.20 yr)  
   first obs. used      1949-11-21  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48042  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:35:24  

Additional Information
 Earth MOID = 1.07533 au 
 Jupiter MOID = 2.51683 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 14.5   n/a MPO502376  
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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-03 18:41 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin