+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   16906 Giovannisilva (1998 DY23) Classification: Main-belt Asteroid          SPK-ID: 2016906 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04451319151022493 7.1316e-08   a 2.987249064320365 2.2527e-08 au q 2.854277074631533 2.1565e-07 au i 11.18200915289695 7.7957e-06 deg node 144.4324066993849 3.0969e-05 deg peri 59.9749312875341 7.9621e-05 deg M 130.0390093920451 6.9915e-05 deg tp 2458715.296721869536 (2019-Aug-19.79672187) 0.00036865 TDB period 1885.843188697565 5.16 2.1332e-05 5.84e-08 d yr n .1908960417056891 2.1593e-09 deg/d Q 3.120221054009198 2.353e-08 au   Orbit Determination Parameters    # obs. used (total)      688      data-arc span      9436 days (25.83 yr)      first obs. used      1995-07-22      last obs. used      2021-05-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .6535      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 04:15:32   Additional Information  Earth MOID = 1.87317 au   Jupiter MOID = 1.88556 au   T_jup = 3.227  [ 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 14.67   n/a E2021B10   diameter diameter 3.963 km 0.872 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.163   0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   16906 Giovannisilva           Discovered 1998 Feb. 18 at Osservatorio San Vittore. Italian astronomer Giovanni Silva (1882-1957) was an assistant at the International Latitude Station at Carloforte and later director of the Padua Observatory until 1952. He contributed to classical astronomy, celestial mechanics, geodesy, astrophysics and the calculus of probability. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020427/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] Alternate Designations  1998 DY23 = 1995 OU4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Aug-03 02:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin