+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1684 Iguassu (1951 QE) Classification: Main-belt Asteroid          SPK-ID: 2001684 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256874 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1235897 n/a   a 3.1066375 n/a AU q 2.7226891 n/a AU i 3.66278 n/a deg node 105.43434 n/a deg peri 152.05727 n/a deg M 186.70778 n/a deg tp 2457363.2441295 (2015-Dec-06.74412950) n/a JED period 2000.0198891 5.48 n/a n/a d yr n 0.17999821 n/a deg/d Q 3.4905859 n/a AU   Orbit Determination Parameters    # obs. used (total)      1440      first obs. used      1922-??-??      last obs. used      2013-03-15      # oppositions      38      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.205  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.80 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7 diameter diameter 26.53 km 1.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7 geometric albedo albedo 0.1202   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 7 1684 Iguassu (1951 QE)          Discovered 1951-Aug-23 by Itzigsohn, M. at La Plata Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1951 QE = 1934 LN = 1935 SK1 = 1939 HK = 1949 DE = 1950 JT = 1965 AA1 = A922 DA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-20 11:54 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin