+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   113394 Niebur (2002 SN21) Classification: Main-belt Asteroid          SPK-ID: 2113394 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO248071 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0724520 n/a   a 2.7745337 n/a AU q 2.5735132 n/a AU i 1.29511 n/a deg node 18.73669 n/a deg peri 353.31282 n/a deg M 98.00096 n/a deg tp 2455940.9727692 (2012-Jan-14.47276920) n/a JED period 1688.0426793 4.62 n/a n/a d yr n 0.21326475 n/a deg/d Q 2.9755542 n/a AU   Orbit Determination Parameters    # obs. used (total)      172      first obs. used      2000-??-??      last obs. used      2012-12-11      # oppositions      10      planetary ephem.      DE403      condition code      0      fit RMS      0.46      data source      MPC:mpu      producer      MPCLINUX   Additional Information  T_jup = 3.332  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.7 mag n/a MPO248071   113394 Niebur           Discovered 2002 Sept. 26 by MEAT at Palomar. Trained as an astrophysicist, Susan Niebur (1978-2012) was a former Discovery Program Scientist at NASA and contributed to space-science policy. She founded the Women in Planetary Science and Toddler Planet websites. Name suggested by A. Sohus. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20120406/MPCPages.arc Last Updated: 2012-04-09 Alternate Designations  2002 SN21 = 2000 EE194 = 2004 AB25  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 15:11 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin