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6390 Hirabayashi (1990 BG1)
Classification: Main-belt Asteroid          SPK-ID: 2006390
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1764078554134664 3.6038e-08  
a 2.880910053723339 1.1891e-08 au
q 2.37269488950691 9.9626e-08 au
i 6.072505371173745 3.9854e-06 deg
node 75.24464614570626 3.6608e-05 deg
peri 78.7634546124165 3.901e-05 deg
M 56.33471937964911 1.3795e-05 deg
tp 2458721.009783451189
(2019-Aug-25.50978345)
6.7724e-05 TDB
period 1786.047380115637
4.89
1.1058e-05
3.028e-08
d
yr
n .20156240198773 1.2479e-09 deg/d
Q 3.389125217939768 1.3989e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2362  
   data-arc span      20335 days (55.67 yr)  
   first obs. used      1964-11-30  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46598  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:39:33  

Additional Information
 Earth MOID = 1.39218 au 
 Jupiter MOID = 1.6425 au 
 T_jup = 3.263 
[ 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 12.9   n/a MPO473855  
diameter diameter 14.707 km 0.120 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
geometric albedo albedo 0.074   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

6390 Hirabayashi (1990 BG1)          Discovered 1990-Jan-26 by Endate, K., Watanabe, K. at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1990 BG1 = 1964 WJ1 = 1976 JK2 = 1987 MH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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