+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   16851 (1997 YU1) Classification: Mars-crossing Asteroid          SPK-ID: 2016851 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO229171 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.3647848 n/a   a 2.2949328 n/a AU q 1.4577762 n/a AU i 20.78662 n/a deg node 292.82563 n/a deg peri 91.18192 n/a deg M 200.48805 n/a deg tp 2456963.1574816 (2014-Nov-01.65748160) n/a JED period 1269.8527814 3.48 n/a n/a d yr n 0.28349743 n/a deg/d Q 3.1320894 n/a AU   Orbit Determination Parameters    # obs. used (total)      277      first obs. used      1993-??-??      last obs. used      2012-04-11      # oppositions      7      planetary ephem.      DE403      condition code      1      fit RMS      0.50      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.424   MPC critical-list numbered object  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.3 mag n/a PDS3 (MPO 2953)   16851 (1997 YU1)          Discovered 1997-Dec-21 by Beijing Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1997 YU1 = 1993 OK2 = 2000 NY2  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-20 01:52 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin