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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05127076392101335 1.3181e-08  
a 2.934873559614312 1.1471e-08 au
q 2.784400350201302 3.9835e-08 au
i 3.019800104611987 2.5861e-07 deg
node 123.0456701855995 9.8761e-06 deg
peri 348.8815714074336 2.4025e-05 deg
M 196.5652986154216 2.4388e-05 deg
tp 2460230.227820245962
(2023-Oct-12.72782025)
0.00012651 TDB
period 1836.464427357331
5.03
1.0767e-05
2.948e-08
d
yr
n .196028844685023 1.1493e-09 deg/d
Q 3.085346769027321 1.2059e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2828  
   data-arc span      14148 days (38.74 yr)  
   first obs. used      1982-11-14  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4877  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 19:29:02  

Additional Information
 Earth MOID = 1.80141 au 
 Jupiter MOID = 1.95907 au 
 T_jup = 3.271 
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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 13.33   n/a MPO636188  
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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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 1.98799038057963 1.98799015852153 1.98799060263786 3.47663101404754 3.35183886269693 2446873.110129214 0.491023352502499 26.607004491023 7.01709310912071 80.0682184848468 7190670.740805 T 40 CATAB v2.0g-lin.ifort 2021-Aug-24 19:30:44 2021-Aug-24 19:30
2021-Dec-13 02:19 < 00:01 Jupiter 1.95905015938524 1.95904996951534 1.95905034925513 3.22834260440788 3.09151552295711 2459561.596637185 0.144102991619789 9.94415627580858 4.26127898397592 -55.2152755501324 9315642.78143145 T 40 CATAB v2.0g-lin.ifort 2021-Aug-24 19:30:44 2021-Aug-24 19:30
2117-Sep-10 21:03 00:02 Jupiter 1.98035960518208 1.98035939340759 1.98035981695714 3.43236817576864 3.30540895515627 2494531.376919954 1.79465839327192 95.2145964131665 6.25064905331112 87.5808771644527 7787319.68439101 T 40 CATAB v2.0g-lin.ifort 2021-Aug-24 19:30:44 2021-Aug-24 19:30
2152-Jun-07 05:22 00:02 Jupiter 1.95847792749231 1.95847768199832 1.95847817298785 3.21801697795868 3.0806903235874 2507219.723693219 2.40618617618773 119.251823097303 5.56108174419079 -85.5974337695816 7988358.11293802 T 40 CATAB v2.0g-lin.ifort 2021-Aug-24 19:30:44 2021-Aug-24 19:30

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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