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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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1987-Mar-18 14:39 < 00:01 Jupiter 1.98799037987398 1.98799015470849 1.98799060503948 3.47663103390294 3.35183888324645 2446873.110134501 0.504034575154463 27.2533257136117 7.02830993728784 79.8714954855235 7173129.94835615 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 20:23:40 2021-Apr-12 20:23
2021-Dec-13 02:19 < 00:01 Jupiter 1.95905015898054 1.95904996696653 1.95905035099454 3.22834259063871 3.09151550854963 2459561.596626915 0.149922597556544 10.2209260339871 4.27428694679594 -55.7178550052325 9310670.59429437 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 20:23:40 2021-Apr-12 20:23
2117-Sep-10 21:03 00:02 Jupiter 1.98035960629336 1.98035939175987 1.98035982082751 3.43236816464682 3.30540894367988 2494531.376923756 1.85654254250059 98.5256772129139 6.25113046893611 87.5695303089048 7786891.22189928 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 20:23:40 2021-Apr-12 20:23
2152-Jun-07 05:22 00:02 Jupiter 1.95847792642373 1.95847767490431 1.95847817794483 3.21801697853817 3.08069032411612 2507219.723705411 2.48816017992488 123.343484485798 5.56548447515723 -85.5707489874896 7981273.25590708 T 38 CATAB v2.0f-lin.ifort 2021-Apr-12 20:23:40 2021-Apr-12 20:23

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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