+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   16786 (1997 AT1) Classification: Main-belt Asteroid          SPK-ID: 2016786 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO253480 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1081910 n/a   a 3.1726175 n/a AU q 2.8293688 n/a AU i 12.62968 n/a deg node 296.73384 n/a deg peri 172.23482 n/a deg M 316.79834 n/a deg tp 2456648.1982578 (2013-Dec-21.69825780) n/a JED period 2064.0728343 5.65 n/a n/a d yr n 0.17441245 n/a deg/d Q 3.5158662 n/a AU   Orbit Determination Parameters    # obs. used (total)      653      first obs. used      1979-??-??      last obs. used      2013-02-18      # oppositions      15      planetary ephem.      DE403      condition code      0      fit RMS      0.53      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.155  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.80 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 diameter diameter 24.02 km 2.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 geometric albedo albedo 0.0584   0.011 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2 16786 (1997 AT1)          Discovered 1997-Jan-02 by Shimizu, Y., Urata, T. at Nachi-Katsuura (905) Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1997 AT1 = 1952 BC2 = 1969 AF1 = 1979 YH = 1990 WZ13  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 22:51 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin