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4640 Hara (1989 GA)
Classification: Main-belt Asteroid          SPK-ID: 2004640
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1073840813970224 1.1424e-08  
a 2.25255455594667 5.9275e-09 au
q 2.010666054159659 2.5041e-08 au
i 4.210485916990202 1.5283e-06 deg
node 347.696987615699 9.3859e-06 deg
peri 138.4761961661482 1.3445e-05 deg
M 201.9479932419638 1.4542e-05 deg
tp 2459742.636837197057
(2022-Jun-12.13683720)
5.0226e-05 TDB
period 1234.842033291787
3.38
4.8742e-06
1.334e-08
d
yr
n .2915352654787172 1.1507e-09 deg/d
Q 2.49444305773368 6.564e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2726  
   data-arc span      30247 days (82.81 yr)  
   first obs. used      1938-02-22  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41926  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:35:27  

Additional Information
 Earth MOID = 1.02786 au 
 Jupiter MOID = 2.5429 au 
 T_jup = 3.615 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.31   n/a E2021B10  
diameter diameter 6.053 km 0.198 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.534 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Black, S.; Linville, D.; Michalik, D.; Wolf, M.; Ditteon, R. (2016) Minor Planet Bull. 43, 287-289.]
geometric albedo albedo 0.304   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4640 Hara (1989 GA)          Discovered 1989-Apr-01 by Kushida and Muramatsu at Yatsugatake
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 GA = 1938 DB = 1982 DC3 = 1982 DM6 = 1987 UV2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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