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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074126529186366 3.3348e-08  
a 2.251647606954326 6.3558e-09 au
q 2.009792164053462 7.48e-08 au
i 4.208430720792977 4.3424e-06 deg
node 347.7636629982299 4.4062e-05 deg
peri 137.83793256 4.8059e-05 deg
M 27.62879242874862 1.8555e-05 deg
tp 2458505.787246337817
(2019-Jan-22.28724634)
6.3574e-05 TDB
period 1234.096329266544
3.38
5.2253e-06
1.431e-08
d
yr
n .2917114259743058 1.2351e-09 deg/d
Q 2.493503049855189 7.0385e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2412  
   data-arc span      29662 days (81.21 yr)  
   first obs. used      1938-02-22  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43435  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 00:34:53  

Additional Information
 Earth MOID = 1.02758 au 
 Jupiter MOID = 2.54747 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 13.3   n/a MPO473830  
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. 2019-January); 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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