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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 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 
[ 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 1.98799038130576 1.987990157597 1.98799060501464 3.47663104535258 3.35183889521391 2446873.110138753 0.497752742955343 26.9406492451926 7.02361128877594 79.9590354033856 7180666.82040464 T 39 CATAB v2.0g-lin.ifort 2021-Jul-08 01:29:39 2021-Jul-08 01:29
2021-Dec-13 02:19 < 00:01 Jupiter 1.95905016000755 1.95904996898598 1.95905035102913 3.2283425997857 3.09151551817479 2459561.596630143 0.147166499059668 10.0903583178766 4.2679441086647 -55.478338124764 9313291.3383488 T 39 CATAB v2.0g-lin.ifort 2021-Jul-08 01:29:39 2021-Jul-08 01:29
2117-Sep-10 21:03 00:02 Jupiter 1.98035960499195 1.98035939182913 1.98035981815534 3.43236817034397 3.30540894951081 2494531.376915003 1.82691247325344 96.9412377519368 6.25078001348396 87.576295651007 7787221.33968434 T 39 CATAB v2.0g-lin.ifort 2021-Jul-08 01:29:39 2021-Jul-08 01:29
2152-Jun-07 05:22 00:02 Jupiter 1.95847792838626 1.95847767970199 1.95847817707219 3.21801697958369 3.08069032534892 2507219.723688820 2.44888640407757 121.383602837764 5.5637694030058 -85.5821043879698 7984060.38455016 T 39 CATAB v2.0g-lin.ifort 2021-Jul-08 01:29:39 2021-Jul-08 01:29

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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