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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08545023781525639 3.6903e-08  
a 2.990756820237641 1.3857e-08 au
q 2.735195938700735 1.1088e-07 au
i 8.700677979849003 4.2349e-06 deg
node 300.1097770049738 3.1559e-05 deg
peri 119.8503607198914 4.5596e-05 deg
M 163.4657221538431 3.2714e-05 deg
tp 2458342.683735790241
(2018-Aug-12.18373579)
0.00016968 TDB
period 1889.165820494636
5.17
1.3129e-05
3.595e-08
d
yr
n .1905602970869661 1.3244e-09 deg/d
Q 3.246317701774548 1.5041e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2145  
   data-arc span      23865 days (65.34 yr)  
   first obs. used      1955-09-14  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44681  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 19:04:56  

Additional Information
 Earth MOID = 1.76067 au 
 Jupiter MOID = 2.01751 au 
 T_jup = 3.233 
[ show covariance matrix ]

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 12.47   n/a E2021B10  
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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