+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17437 Stekene (1989 SC4) Classification: Main-belt Asteroid          SPK-ID: 2017437 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05254156364072284 3.9445e-08   a 3.163646515057471 1.9873e-08 au q 2.997423580349828 1.2439e-07 au i 21.53328552351374 5.2392e-06 deg node 191.5433711471629 1.0567e-05 deg peri 319.1548318756403 4.7324e-05 deg M 38.84933071327893 4.5192e-05 deg tp 2458778.700074520084 (2019-Oct-22.20007452) 0.00025822 TDB period 2055.32429276773 5.63 1.9366e-05 5.302e-08 d yr n .1751548411444205 1.6504e-09 deg/d Q 3.329869449765115 2.0917e-08 au   Orbit Determination Parameters    # obs. used (total)      1815      data-arc span      11221 days (30.72 yr)      first obs. used      1989-09-26      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50735      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 18:09:48   Additional Information  Earth MOID = 2.02357 au   Jupiter MOID = 1.67149 au   T_jup = 3.093  [ 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 13.0   n/a MPO502302   diameter diameter 13.992 km 2.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.075   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17437 Stekene           Discovered 1989 Sept. 26 by E. W. Elst at the European Southern Observatory. Stekene is a town in East-Flanders. Its church has a tower from the thirteenth century. 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 2017-11-04 Last Updated: 2017-11-07 [ show close-approach data ] Alternate Designations  1989 SC4 = 1995 WN42  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-23 20:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin