+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   6868 Seiyauyeda (1992 HD) Classification: Main-belt Asteroid          SPK-ID: 2006868 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1503575993839719 2.4404e-08   a 2.660020307731523 8.7963e-09 au q 2.260066039948397 6.5304e-08 au i 3.378634231956897 4.3527e-07 deg node 120.0382279360677 1.4164e-05 deg peri 84.56403016124264 1.6279e-05 deg M 225.8400532882737 1.0335e-05 deg tp 2459791.035800822966 (2022-Jul-30.53580082) 4.698e-05 TDB period 1584.62263519732 4.34 7.8602e-06 2.152e-08 d yr n .2271834265166685 1.1269e-09 deg/d Q 3.059974575514649 1.0119e-08 au   Orbit Determination Parameters    # obs. used (total)      2848      data-arc span      42356 days (115.96 yr)      first obs. used      1905-03-26      last obs. used      2021-03-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .42848      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 19:10:32   Additional Information  Earth MOID = 1.2585 au   Jupiter MOID = 1.9021 au   T_jup = 3.367  [ 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 12.86   n/a E2021B10   diameter diameter 14.401 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.078   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   6868 Seiyauyeda           Discovered 1992 Apr. 22 by Y. Kushida and O. Muramatsu at the Yatsugatake South Base Observatory. Seiya Uyeda (b. 1929), a professor emeritus at Tokyo University, has greatly contributed to the study of geophysics and electromagnetic earthquake prediction. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030501/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] Alternate Designations  1992 HD = 1973 YU3 = 1976 SN9 = 1979 HR4 = A905 FA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 15:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin