+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   18357 (1990 SR2) Classification: Main-belt Asteroid          SPK-ID: 2018357 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO234934 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1959419 n/a   a 2.1877419 n/a AU q 1.7590716 n/a AU i 4.73726 n/a deg node 32.54462 n/a deg peri 279.70273 n/a deg M 28.16280 n/a deg tp 2456308.0374473 (2013-Jan-15.53744730) n/a JED period 1181.9321577 3.24 n/a n/a d yr n 0.30458601 n/a deg/d Q 2.6164122 n/a AU   Orbit Determination Parameters    # obs. used (total)      747      first obs. used      1977-??-??      last obs. used      2012-07-24      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.646  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.4 mag n/a PDS3 (MPO 5170)   18357 (1990 SR2)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar (675) Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1990 SR2 = 1977 RA2 = 1990 SX28 = 1999 FX30  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 12:19 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin