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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456871.5 (2014-Aug-02.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05452836764821176 1.3179e-08  
q 2.769939866753771 3.9912e-08 au
tp 2456560.142702359274
(2013-Sep-24.64270236)
0.00011227 TDB
node 123.0638145983026 9.8972e-06 deg
peri 348.1990378587191 2.2952e-05 deg
i 3.019352526916067 2.595e-07 deg
  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
 Jupiter MOID = 1.95907 au 
 T_jup = 3.271 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.736921297750745E-16 -5.046267918499146E-16 6.272660601059823E-13 1.185595291560188E-14 9.265760403276001E-14 3.252201812879062E-16
q -5.046267918499146E-16 1.593004745356476E-15 -1.471079812470703E-12 -3.201242242524625E-14 -1.985142007125805E-13 -9.942389959996999E-16
tp 6.272660601059823E-13 -1.471079812470703E-12 1.260487077978477E-8 -4.122705630766096E-12 2.313419364850873E-9 -9.253228238768755E-13
node 1.185595291560188E-14 -3.201242242524625E-14 -4.122705630766096E-12 9.795538930368941E-11 -1.000031679716669E-10 -1.739072802357304E-12
peri 9.265760403276001E-14 -1.985142007125805E-13 2.313419364850873E-9 -1.000031679716669E-10 5.267728963398186E-10 1.605838178431437E-12
i 3.252201812879062E-16 -9.942389959996999E-16 -9.253228238768755E-13 -1.739072802357304E-12 1.605838178431437E-12 6.734146711620055E-14

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

[ show close-approach data ]
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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