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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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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.


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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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Orbital Elements at Epoch 2456870.5 (2014-Aug-01.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08536050595966416 3.6436e-08  
q 2.738013607939863 1.0952e-07 au
tp 2456459.858171495727
(2013-Jun-16.35817150)
0.0001677 TDB
node 300.1381876878 3.1549e-05 deg
peri 121.3874345906937 4.5776e-05 deg
i 8.701666512443079 4.2515e-06 deg
  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
 Jupiter MOID = 2.01673 au 
 T_jup = 3.233 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.327556824020592E-15 -3.96383711410518E-15 -1.923327533346271E-12 -3.065348890242884E-15 -4.172405775675908E-13 2.900448381661124E-16
q -3.96383711410518E-15 1.199399296142577E-14 6.187967671401033E-12 7.508452134741842E-15 1.33818616512678E-12 -7.993772510562861E-16
tp -1.923327533346271E-12 6.187967671401033E-12 2.812215214437962E-8 -3.254940409124514E-11 5.594757631057898E-9 -7.260451082559811E-12
node -3.065348890242884E-15 7.508452134741842E-15 -3.254940409124514E-11 9.953131770072103E-10 -9.899405868827541E-10 4.933109485821751E-11
peri -4.172405775675908E-13 1.33818616512678E-12 5.594757631057898E-9 -9.899405868827541E-10 2.095436772197794E-9 -5.02038683667813E-11
i 2.900448381661124E-16 -7.993772510562861E-16 -7.260451082559811E-12 4.933109485821751E-11 -5.02038683667813E-11 1.807490204975611E-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 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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