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1971 Hagihara (1955 RD1)
Classification: Main-belt Asteroid          SPK-ID: 2001971
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

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Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08536064229695116 3.6869e-08  
a 2.991234713265206 1.3904e-08 au
q 2.735900996879952 1.1077e-07 au
i 8.70067183541796 4.2517e-06 deg
node 300.11037097 3.1568e-05 deg
peri 119.9629277965811 4.5693e-05 deg
M 125.2339375517837 3.2727e-05 deg
tp 2458343.154491193927
(2018-Aug-12.65449119)
0.0001703 TDB
period 1889.618643287764
5.17
1.3175e-05
3.607e-08
d
yr
n .1905146317638107 1.3283e-09 deg/d
Q 3.24656842965046 1.509e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2118  
   data-arc span      23652 days (64.76 yr)  
   first obs. used      1955-09-14  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44689  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:39:17  

Additional Information
 Earth MOID = 1.76198 au 
 Jupiter MOID = 2.01673 au 
 T_jup = 3.233 
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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 12.4   n/a MPO435715  
diameter diameter 12.289 km 0.156 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.135   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1971 Hagihara (1955 RD1)          Discovered 1955-Sep-14 by Goethe Link Observatory at Brooklyn
Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1955 RD1 = 1971 TZ2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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