+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   23489 (1991 PU16) Classification: Main-belt Asteroid          SPK-ID: 2023489 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250441 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1218916 n/a   a 2.3714217 n/a AU q 2.0823653 n/a AU i 3.26033 n/a deg node 21.08719 n/a deg peri 302.82822 n/a deg M 350.35286 n/a deg tp 2456436.2443731 (2013-May-23.74437310) n/a JED period 1333.8641619 3.65 n/a n/a d yr n 0.26989255 n/a deg/d Q 2.6604781 n/a AU   Orbit Determination Parameters    # obs. used (total)      739      first obs. used      1991-??-??      last obs. used      2012-07-20      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.532  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.3 mag n/a PDS3 (MPO 11101)   23489 (1991 PU16)          Discovered 1991-Aug-07 by Holt, H. E. at Palomar (675) Reference: 20010408/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 PU16 = 1995 VB1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 00:07 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin