+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   7738 Heyman (1981 WS1) Classification: Main-belt Asteroid          SPK-ID: 2007738 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1825568632525022 2.2105e-08   a 2.249588964395558 6.4139e-09 au q 1.83891105944806 5.0443e-08 au i 5.956943868002047 8.4728e-07 deg node 66.29818594006224 3.8351e-06 deg peri 220.7005264777769 4.7319e-06 deg M 317.552621220686 4.9851e-06 deg tp 2459345.812027413867 (2021-May-11.31202741) 1.7534e-05 TDB period 1232.404246701935 3.37 5.2706e-06 1.443e-08 d yr n .2921119437582305 1.2493e-09 deg/d Q 2.660266869343056 7.5848e-09 au   Orbit Determination Parameters    # obs. used (total)      2217      data-arc span      14100 days (38.60 yr)      first obs. used      1981-10-30      last obs. used      2020-06-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47491      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 19:59:43   Additional Information  Earth MOID = .825509 au   Jupiter MOID = 2.49973 au   T_jup = 3.599  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.09   n/a E2021B10   diameter diameter 3.859 km 0.232 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.327   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   7738 Heyman           Discovered 1981 Nov. 24 at the Oak Ridge Observatory. Named in honor of I. Michael Heyman (b. 1930), secretary and linchpin of the Smithsonian Institution's diverse and incomparably rich programs. Educator, legal scholar, civil rights champion, he has unfailingly supported research at the frontiers of astronomy. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19980808/MPCPages.arc Last Updated: 2009-11-17 Alternate Designations  1981 WS1 = 1991 UW  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-16 02:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin