+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01622249923825597 4.1803e-08   a 3.079252248823073 1.6534e-08 au q 3.029299081562142 1.3125e-07 au i 8.408993701015209 4.8687e-06 deg node 29.458413462 2.2982e-05 deg peri 17.83528232154733 0.00012105 deg M 214.6223952922363 0.0001203 deg tp 2459997.505532294662 (2023-Feb-22.00553229) 0.00066225 TDB period 1973.632680238785 5.40 1.5896e-05 4.352e-08 d yr n .1824047623473911 1.4691e-09 deg/d Q 3.129205416084003 1.6802e-08 au   Orbit Determination Parameters    # obs. used (total)      1267      data-arc span      17994 days (49.26 yr)      first obs. used      1971-04-16      last obs. used      2020-07-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .57648      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:08:02   Additional Information  Earth MOID = 2.03599 au   Jupiter MOID = 1.91718 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 14.08   n/a E2021B10   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-May-08 20:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin