+ View the NASA Portal + Near-Earth Object (NEO) Project Search JPL JPL Small-Body Database Browser Search: [ help ]   1231 Auricula (1931 TE2) Classification: Main-belt Asteroid          SPK-ID: 2001231 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2455200.5 (2010-Jan-04.0) TDB Reference: MPO169559 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0855356 n/a   a 2.6701410 n/a AU q 2.4417489 n/a AU i 11.49273 n/a deg node 342.09152 n/a deg peri 247.05651 n/a deg M 120.96899 n/a deg tp 2454664.9854422 (2008-Jul-17.48544221) n/a JED period 1593.6748815 4.36 n/a n/a d yr n 0.22589300 n/a deg/d Q 2.8985331 n/a AU   Orbit Determination Parameters    # obs. used (total)      776      first obs. used      1931-??-??      last obs. used      2009-12-16      # oppositions      27      planetary ephem.      DE403      quality code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPC   Additional Information  T_jup = 3.348  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.60 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 diameter diameter 22.52 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 geometric albedo albedo 0.0798   0.014 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 1231 Auricula (1931 TE2)           Discovered 1931-Oct-10 by Reinmuth, K. at Heidelberg (024) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2010-Feb-10 08:06 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin