+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   52228 Protos (1977 RN) Classification: Outer Main-belt Asteroid          SPK-ID: 2052228 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO253694 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1203930 n/a   a 3.2104293 n/a AU q 2.8239161 n/a AU i 27.93818 n/a deg node 48.37926 n/a deg peri 332.91319 n/a deg M 34.32116 n/a deg tp 2456200.1900437 (2012-Sep-29.69004370) n/a JED period 2101.0823726 5.75 n/a n/a d yr n 0.17134026 n/a deg/d Q 3.5969425 n/a AU   Orbit Determination Parameters    # obs. used (total)      469      first obs. used      1977-??-??      last obs. used      2013-02-18      # oppositions      12      planetary ephem.      DE403      condition code      0      fit RMS      0.57      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 2.999  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6 mag n/a MPO253694   52228 Protos           Discovered 1977 Sept. 5 by L. D. Schmadel at the European Southern Observatory. This Greek word indicates the discoverer's first minor planet detection. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040107/MPCPages.arc Last Updated: 2004-01-07 Alternate Designations  1977 RN = 2001 SK109  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 06:49 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin