+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21237 Suematsu (1995 WF5) Classification: Main-belt Asteroid          SPK-ID: 2021237 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1532236134207005 2.7274e-08   a 2.646260524427793 1.0481e-08 au q 2.240790924822409 7.3222e-08 au i 4.388519221662544 3.6455e-06 deg node 149.415365357172 3.985e-05 deg peri 289.1502470833415 4.2052e-05 deg M 278.6533298004719 1.4851e-05 deg tp 2459555.791325265438 (2021-Dec-07.29132527) 6.5948e-05 TDB period 1572.343118431658 4.30 9.3416e-06 2.558e-08 d yr n .2289576592920023 1.3603e-09 deg/d Q 3.051730124033178 1.2087e-08 au   Orbit Determination Parameters    # obs. used (total)      1868      data-arc span      10566 days (28.93 yr)      first obs. used      1991-12-30      last obs. used      2020-12-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49259      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:51:32   Additional Information  Earth MOID = 1.26055 au   Jupiter MOID = 2.19721 au   T_jup = 3.372  [ 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 14.03   n/a E2021B10   diameter diameter 4.805 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.278   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   21237 Suematsu           Discovered 1995 Nov. 18 by K. Endate and K. Watanabe at Kitami. Kenji Suematsu (b. 1966) teaches physics and earth sciences as a high school teacher in Nagasaki Prefecture. He is an enthusiastic teacher for students of all grades, from elementary through high school, and shows a particular passion for lectures on astronomy. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2018-10-26 Last Updated: 2019-04-09 [ show close-approach data ] Alternate Designations  1995 WF5 = 1991 YR  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 04:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin