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JPL Small-Body Database Browser
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8144 Hiragagennai (1982 VY2)
Classification: Main-belt Asteroid          SPK-ID: 2008144
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05324327040170235 3.5807e-08  
a 2.929962542479237 1.4484e-08 au
q 2.773961754563156 1.0651e-07 au
i 3.019380074750583 4.1045e-06 deg
node 123.052268707817 7.4405e-05 deg
peri 348.1078894971577 8.3468e-05 deg
M 40.97930392522783 3.7615e-05 deg
tp 2458391.977172271635
(2018-Sep-30.47717227)		 0.00019135 TDB
period 1831.856834835048
5.02		 1.3584e-05
3.719e-08		 d
yr
n .1965219078009536 1.4573e-09 deg/d
Q 3.085963330395318 1.5256e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2161  
   data-arc span      13326 days (36.48 yr)  
   first obs. used      1982-11-14  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50943  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 01:33:31  

Additional Information
 Earth MOID = 1.79091 au 
 Jupiter MOID = 1.96509 au 
 T_jup = 3.272 
[ 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 13.2   n/a MPO302115  
diameter diameter 6.612 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.255   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8144 Hiragagennai           Discovered 1982 Nov. 14 by H. Kosai and K. Hurukawa at the Kiso Station of the Tokyo Astronomical Observatory.
Hiraga Gennai (1728-1779) was born in Takamatsu, Kagawa prefecture. He was a scientist, pharmacologist and playwright in the middle Edo period.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

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Alternate Designations
 1982 VY2 = 1986 PU2 = 1989 CQ8 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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