+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   21041 (1990 QO1) Classification: Main-belt Asteroid          SPK-ID: 2021041 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO257017 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0452283 n/a   a 3.0047891 n/a AU q 2.8688876 n/a AU i 10.10832 n/a deg node 337.18899 n/a deg peri 259.42138 n/a deg M 230.66514 n/a deg tp 2457083.9905528 (2015-Mar-02.49055280) n/a JED period 1902.4770198 5.21 n/a n/a d yr n 0.18922699 n/a deg/d Q 3.1406906 n/a AU   Orbit Determination Parameters    # obs. used (total)      648      first obs. used      1977-??-??      last obs. used      2013-03-05      # oppositions      15      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.226  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.7 mag n/a PDS3 (MPO 8624)   21041 (1990 QO1)          Discovered 1990-Aug-22 by Holt, H. E. at Palomar (675) Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1990 QO1 = 1977 AD2 = 2000 PZ22  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 22:35 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin