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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05241079900834404 3.2076e-08  
a 2.931703497661078 1.2368e-08 au
q 2.778050574893105 9.2469e-08 au
i 3.019679700516331 3.5033e-06 deg
node 123.0468217641973 7.2521e-05 deg
peri 348.4957523503627 8.1177e-05 deg
M 158.53448829884 3.6938e-05 deg
tp 2458393.079542233388
(2018-Oct-01.57954223)
0.00018722 TDB
period 1833.489784557542
5.02
1.1602e-05
3.176e-08
d
yr
n .1963468807037151 1.2425e-09 deg/d
Q 3.085356420429052 1.3016e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2576  
   data-arc span      13796 days (37.77 yr)  
   first obs. used      1982-11-14  
   last obs. used      2020-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49406  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:23:01  

Additional Information
 Earth MOID = 1.7946 au 
 Jupiter MOID = 1.96163 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 13.32   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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