+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   4137 Crabtree (1970 WC) Classification: Main-belt Asteroid          SPK-ID: 2004137 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ 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 .01813559861932751 7.5588e-08   a 2.364557825493847 1.3837e-08 AU q 2.321675153858501 1.8227e-07 AU i 3.799792979266235 7.9198e-06 deg node 352.9374660930475 8.269e-05 deg peri 214.5389023543136 0.00018502 deg M 84.57561079033299 0.00016754 deg tp 2456088.491821733762 (2012-Jun-09.99182173) 0.000618 JED period 1328.077245038165 3.64 1.1657e-05 3.192e-08 d yr n .2710685702544768 2.3793e-09 deg/d Q 2.407440497129193 1.4088e-08 AU   Orbit Determination Parameters    # obs. used (total)      1216      data-arc span      21504 days (58.87 yr)      first obs. used      1954-05-23      last obs. used      2013-04-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .48615      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:01:42   Additional Information  Earth MOID = 1.31737 AU   T_jup = 3.546  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.2 mag n/a PDS3 (MPC 28111)   4137 Crabtree           Discovered 1970 Nov. 24 by L. Kohoutek at Bergedorf. William Crabtree (1610-1644), a cloth merchant in Salford, near Manchester, became the second person knowingly to observe a transit of Venus, after he had been alerted to the 1639 event by Jeremiah Horrocks. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050919/MPCPages.arc Last Updated: 2005-09-26 [ show close-approach data ] Alternate Designations  1970 WC = 1972 GK1 = 1977 RO6 = 1986 AV1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-24 05:15 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin