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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08536064245937827 3.6865e-08  
a 2.991234713196143 1.3896e-08 au
q 2.735900996330927 1.1075e-07 au
i 8.700672025948188 4.2376e-06 deg
node 300.1103711922569 3.1566e-05 deg
peri 119.9629277830222 4.5655e-05 deg
M 125.2339373870832 3.2692e-05 deg
tp 2458343.154492081196
(2018-Aug-12.65449208)
0.00017011 TDB
period 1889.618643222321
5.17
1.3167e-05
3.605e-08
d
yr
n .1905146317704088 1.3275e-09 deg/d
Q 3.24656843006136 1.5082e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2141  
   data-arc span      23678 days (64.83 yr)  
   first obs. used      1955-09-14  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44645  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:13:45  

Additional Information
 Earth MOID = 1.76198 au 
 Jupiter MOID = 2.01673 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 12.4   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2006-Nov-21 13:43 < 00:01 Hygie 0.0410179210211594 0.041016340589258 0.0410195014682732 3.50547729153241 3.50547702282377 2454061.071598228 0.600928855752938 93.3044697323464 49.089551365484 39.3021171904686 93900.1914564333 T 28 CATAB v2.0f-lin.ifort 2020-Nov-13 04:13:51 2020-Nov-13 04:13
2016-May-09 22:43 < 00:01 Inter 0.0490303477693086 0.0490285574476055 0.0490321381628074 3.3770341693737 3.37703408096026 2457518.446326312 0.754822670681686 138.709202825615 42.4115092013663 -53.5567956478552 142450.139193121 T 28 CATAB v2.0f-lin.ifort 2020-Nov-13 04:13:51 2020-Nov-13 04:13
2053-Jun-08 02:34 < 00:01 Cybel 0.026002500367338 0.0259968865409535 0.0260081143243911 4.57901778660509 4.57901773551596 2471061.607031412 0.67573484062793 294.899518537673 43.4594411489092 -18.5978231268645 31149.5455212558 T 28 CATAB v2.0f-lin.ifort 2020-Nov-13 04:13:51 2020-Nov-13 04:13

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