+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17612 Whiteknight (1995 UW6) Classification: Main-belt Asteroid          SPK-ID: 2017612 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01647333592074898 4.1788e-08   a 3.078330390065873 1.6653e-08 au q 3.027620019475267 1.3101e-07 au i 8.410291154410487 4.8869e-06 deg node 29.46563968423033 2.2983e-05 deg peri 18.63883918347435 0.00011986 deg M 177.3051536132685 0.00011897 deg tp 2458028.894129962452 (2017-Oct-02.39412996) 0.00064875 TDB period 1972.746454829171 5.40 1.6008e-05 4.383e-08 d yr n .1824867048265328 1.4808e-09 deg/d Q 3.129040760656478 1.6927e-08 au   Orbit Determination Parameters    # obs. used (total)      1258      data-arc span      17994 days (49.26 yr)      first obs. used      1971-04-16      last obs. used      2020-07-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57545      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:20:00   Additional Information  Earth MOID = 2.03573 au   Jupiter MOID = 1.9194 au   T_jup = 3.212  [ 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 14.0   n/a MPO250387   diameter diameter 4.856 km 0.453 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.206   0.096 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17612 Whiteknight           Discovered 1995 Oct. 20 by N. Sato and T. Urata at Chichibu. The White Knight is one of the chess pieces that make up the characters in Lewis Carroll's Through the Looking Glass and what Alice found there. He often falls off his horse. He and the Red Knight fight to decide whose prisoner Alice shall be. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020328/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 16:15 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin