+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   12271 (1990 RC2) Classification: Main-belt Asteroid          SPK-ID: 2012271 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244295 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0499613 n/a   a 2.7272302 n/a AU q 2.5909742 n/a AU i 4.30558 n/a deg node 198.97423 n/a deg peri 165.12957 n/a deg M 356.26319 n/a deg tp 2456417.5757445 (2013-May-05.07574450) n/a JED period 1645.0576915 4.50 n/a n/a d yr n 0.21883731 n/a deg/d Q 2.8634862 n/a AU   Orbit Determination Parameters    # obs. used (total)      791      first obs. used      1990-??-??      last obs. used      2012-11-06      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.56      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.350  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.8 mag n/a PDS3 (MPC 36679)   rotation period rot_per 2.54 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Higgins, D.; Pravec, P.; Kusnirak, P.; Galad, A.; et al. (2006) Minor Planet Bul. 33, 89-91.] 12271 (1990 RC2)          Discovered 1990-Sep-14 by Holt, H. E. at Palomar (675) Reference: 19991123/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1990 RC2 = 1997 EN41 = 1998 KP64  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 16:46 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin