+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05241079900834404 3.2076e-08   a 2.931703497661078 1.2368e-08 au q 2.778050574893105 9.2469e-08 au i 3.019679700516331 3.5033e-06 deg node 123.0468217641973 7.2521e-05 deg peri 348.4957523503627 8.1177e-05 deg M 158.53448829884 3.6938e-05 deg tp 2458393.079542233388 (2018-Oct-01.57954223) 0.00018722 TDB period 1833.489784557542 5.02 1.1602e-05 3.176e-08 d yr n .1963468807037151 1.2425e-09 deg/d Q 3.085356420429052 1.3016e-08 au   Orbit Determination Parameters    # obs. used (total)      2576      data-arc span      13796 days (37.77 yr)      first obs. used      1982-11-14      last obs. used      2020-08-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49406      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:23:01   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.arc Last 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 ] 2021-Mar-04 23:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin