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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05127076378219408 1.3245e-08  
a 2.934873559465249 1.1665e-08 au
q 2.784400350467299 3.9877e-08 au
i 3.019800116203732 2.5875e-07 deg
node 123.0456695609513 9.8887e-06 deg
peri 348.881571970379 2.4041e-05 deg
M 196.5652987301463 2.4442e-05 deg
tp 2460230.227819597200
(2023-Oct-12.72781960)
0.00012685 TDB
period 1836.464427217419
5.03
1.0949e-05
2.998e-08
d
yr
n .1960288446999576 1.1687e-09 deg/d
Q 3.085346768463199 1.2263e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2715  
   data-arc span      14101 days (38.61 yr)  
   first obs. used      1982-11-14  
   last obs. used      2021-06-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49623  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 01:27:44  

Additional Information
 Earth MOID = 1.80141 au 
 Jupiter MOID = 1.95907 au 
 T_jup = 3.271 
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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 13.32   n/a E2021B10  
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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