+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   2478 Tokai (1981 JC) Classification: Main-belt Asteroid          SPK-ID: 2002478 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256881 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0687296 n/a   a 2.2260655 n/a AU q 2.0730689 n/a AU i 4.13804 n/a deg node 228.83970 n/a deg peri 233.44142 n/a deg M 348.70213 n/a deg tp 2456438.5714490 (2013-May-26.07144900) n/a JED period 1213.1243884 3.32 n/a n/a d yr n 0.29675440 n/a deg/d Q 2.3790621 n/a AU   Orbit Determination Parameters    # obs. used (total)      1232      first obs. used      1932-??-??      last obs. used      2013-03-13      # oppositions      23      planetary ephem.      DE403      condition code      0      fit RMS      0.48      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.639  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.8 mag n/a PDS3 (MPC 17265)   rotation period rot_per 25.885 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Higgins, D.; Pravec, P.; Kusnirak, P.; Warner, B.D.; et al. (2007) CBET 824.] [Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm] [Oey, J. (2011) http://minorplanet.haoeydental.com.au] SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 2478 Tokai (1981 JC)          Discovered 1981-May-04 by Furuta, T. at Tokai Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1981 JC = 1931 HH = 1932 SE = 1934 ED = 1939 VH = 1951 JP = 1955 OE = 1955 QV = 1957 BD = 1972 RS = 1978 NU2 = 1979 XR = 1981 JT  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-20 03:26 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin