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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05241073743653148 1.3275e-08  
a 2.931703478618822 1.1861e-08 au
q 2.778050737359165 3.9911e-08 au
i 3.019679406270813 2.5946e-07 deg
node 123.0467538388533 9.9032e-06 deg
peri 348.4958741410479 2.3643e-05 deg
M 158.5344392916457 2.3956e-05 deg
tp 2458393.079799695000
(2018-Oct-01.57979969)
0.00012008 TDB
period 1833.489766693977
5.02
1.1127e-05
3.046e-08
d
yr
n .1963468826167092 1.1916e-09 deg/d
Q 3.085356219878479 1.2483e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2634  
   data-arc span      13796 days (37.77 yr)  
   first obs. used      1982-11-14  
   last obs. used      2020-08-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50107  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:21:43  

Additional Information
 Earth MOID = 1.7946 au 
 Jupiter MOID = 1.96163 au 
 T_jup = 3.272 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456775.5 (2014-Apr-28.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05466278841019991 1.3254e-08  
q 2.770082744905779 3.9974e-08 au
tp 2456560.789893855277
(2013-Sep-25.28989386)
0.00011214 TDB
node 123.0626239600528 9.9077e-06 deg
peri 348.3387379208772 2.2923e-05 deg
i 3.019283410073723 2.5966e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2634  
   data-arc span      13796 days (37.77 yr)  
   first obs. used      1982-11-14  
   last obs. used      2020-08-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50107  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:21:43  

Additional Information
 Jupiter MOID = 1.96163 au 
 T_jup = 3.272 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.756736718157997E-16 -5.076483982084509E-16 6.358704230549781E-13 1.212415893874871E-14 9.393264443911494E-14 3.209896412590464E-16
q -5.076483982084509E-16 1.59792793545482E-15 -1.481018060647079E-12 -3.23697671416025E-14 -1.998736489923652E-13 -9.894761312410845E-16
tp 6.358704230549781E-13 -1.481018060647079E-12 1.257444825074095E-8 -3.349101281763699E-12 2.306527241423396E-9 -9.42695226986567E-13
node 1.212415893874871E-14 -3.23697671416025E-14 -3.349101281763699E-12 9.816252915103984E-11 -1.000669382680723E-10 -1.743172382339707E-12
peri 9.393264443911494E-14 -1.998736489923652E-13 2.306527241423396E-9 -1.000669382680723E-10 5.254736346697089E-10 1.606633925258243E-12
i 3.209896412590464E-16 -9.894761312410845E-16 -9.42695226986567E-13 -1.743172382339707E-12 1.606633925258243E-12 6.742459572857841E-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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