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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 ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08543927491467392 1.0551e-08  
a 2.990807377746329 1.3468e-08 au
q 2.735274963982225 3.5249e-08 au
i 8.700631578726801 2.6267e-07 deg
node 300.11003683564 2.3505e-06 deg
peri 119.745427341624 1.5236e-05 deg
M 200.9386793174405 1.7485e-05 deg
tp 2460231.224527774527
(2023-Oct-13.72452777)
9.4637e-05 TDB
period 1889.213724048871
5.17
1.2761e-05
3.494e-08
d
yr
n .1905554651744036 1.2872e-09 deg/d
Q 3.246339791510432 1.4619e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2222  
   data-arc span      24027 days (65.78 yr)  
   first obs. used      1955-09-14  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4522  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:00:14  

Additional Information
 Earth MOID = 1.76105 au 
 Jupiter MOID = 2.01817 au 
 T_jup = 3.233 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456974.5 (2014-Nov-13.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08542744691469513 1.0792e-08  
q 2.736780312429701 3.5834e-08 au
tp 2456458.804782410686
(2013-Jun-15.30478241)
8.3533e-05 TDB
node 300.1360116921236 2.3492e-06 deg
peri 121.1346270628622 1.516e-05 deg
i 8.70126833983206 2.6277e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2222  
   data-arc span      24027 days (65.78 yr)  
   first obs. used      1955-09-14  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4522  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 13:00:14  

Additional Information
 Jupiter MOID = 2.01817 au 
 T_jup = 3.233 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.164587990818066E-16 -3.632534103750238E-16 4.578616720422E-13 6.697713744762568E-16 7.124505864873235E-14 -4.012443050084074E-16
q -3.632534103750238E-16 1.284093228325219E-15 -1.067672934876386E-12 -4.417897844179031E-15 -1.478376390965453E-13 1.389752244676661E-15
tp 4.578616720422E-13 -1.067672934876386E-12 6.97775035184323E-9 -6.563793007501466E-11 1.251247402636403E-9 6.171076134189097E-12
node 6.697713744762568E-16 -4.417897844179031E-15 -6.563793007501466E-11 5.518654023859854E-12 -1.624703384617565E-11 2.973939658574785E-14
peri 7.124505864873235E-14 -1.478376390965453E-13 1.251247402636403E-9 -1.624703384617565E-11 2.298301207068095E-10 1.02131744291321E-12
i -4.012443050084074E-16 1.389752244676661E-15 6.171076134189097E-12 2.973939658574785E-14 1.02131744291321E-12 6.904854583051286E-14

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

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

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