+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17920 Zarnecki (1999 GE9) Classification: Main-belt Asteroid          SPK-ID: 2017920 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09272763706461462 3.4279e-08   a 2.361146268807488 8.5335e-09 au q 2.142202754537038 8.0418e-08 au i 6.394544757683984 4.4829e-06 deg node 184.7187128821726 3.1355e-05 deg peri 59.65744754620242 3.9325e-05 deg M 269.5896611752812 2.44e-05 deg tp 2459333.311527524655 (2021-Apr-28.81152752) 9.015e-05 TDB period 1325.204080267403 3.63 7.1842e-06 1.967e-08 d yr n .2716562719361371 1.4727e-09 deg/d Q 2.580089783077937 9.3248e-09 au   Orbit Determination Parameters    # obs. used (total)      1313      data-arc span      21757 days (59.57 yr)      first obs. used      1960-09-24      last obs. used      2020-04-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54756      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:42:50   Additional Information  Earth MOID = 1.13806 au   Jupiter MOID = 2.42699 au   T_jup = 3.537  [ 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 15.1   n/a MPO467901   diameter diameter 2.179 km 0.454 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.282   0.135 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17920 Zarnecki           Discovered 1999 Apr. 10 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. John C. Zarnecki (b. 1949), of the Open University, Milton Keynes, has developed spacecraft instrumentation to study the surfaces and atmospheres of planets, satellites and small bodies. He is a PI for the Huygens probe/lander on the Cassini mission to Saturn and Saturn VI (Titan). NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050721/MPCPages.arc Last Updated: 2005-07-21 [ show close-approach data ] Alternate Designations  1999 GE9 = 1977 ED8 = 6249 P-L  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-21 07:27 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin