+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   12422 (1995 US8) Classification: Main-belt Asteroid          SPK-ID: 2012422 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .086820617458716 5.9087e-08   a 2.40138765077383 2.6748e-08 AU q 2.19289769217591 1.4835e-07 AU i 12.09546311464963 8.0352e-06 deg node 69.41899456608206 3.3061e-05 deg peri 212.8767500970675 7.113e-05 deg M 2.117751649516178 6.9556e-05 deg tp 2456392.504155046397 (2013-Apr-10.00415505) 0.00026254 JED period 1359.226509848126 3.72 2.271e-05 6.218e-08 d yr n .2648565175794172 4.4252e-09 deg/d Q 2.609877609371749 2.9071e-08 AU   Orbit Determination Parameters    # obs. used (total)      896      data-arc span      8363 days (22.90 yr)      first obs. used      1990-05-15      last obs. used      2013-04-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .4991      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:48:30   Additional Information  Earth MOID = 1.18576 AU   T_jup = 3.490  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.0 mag n/a PDS3 (MPC 36719)   rotation period rot_per 3.4 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] 12422 (1995 US8)          Discovered 1995-Oct-27 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 19991123/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1995 US8 = 1990 JK1 = 1990 KO1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 23:47 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin