+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20613 Chibaken (1999 RE240) Classification: Main-belt Asteroid          SPK-ID: 2020613 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1091750350874936 4.8154e-08   a 3.054965292633849 1.8108e-08 au q 2.721439349619474 1.5233e-07 au i 12.40911171239332 4.9425e-06 deg node 130.5307975402978 1.9998e-05 deg peri 213.1074783907591 2.8325e-05 deg M 336.6841415421737 1.8946e-05 deg tp 2459126.815532492248 (2020-Oct-04.31553249) 0.00010249 TDB period 1950.328862197459 5.34 1.7341e-05 4.748e-08 d yr n .1845842549827128 1.6412e-09 deg/d Q 3.388491235648225 2.0085e-08 au   Orbit Determination Parameters    # obs. used (total)      1364      data-arc span      9874 days (27.03 yr)      first obs. used      1993-07-20      last obs. used      2020-08-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51844      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 01:37:02   Additional Information  Earth MOID = 1.72114 au   Jupiter MOID = 1.9922 au   T_jup = 3.191  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6   n/a MPO350965   diameter diameter 6.157 km 0.815 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.186   0.128 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   20613 Chibaken           Discovered 1999 Sept. 11 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station. Chiba prefecture is located east of Tokyo. In 2011, some areas were damaged during the Tohoku earthquake. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20120506/MPCPages.arc Last Updated: 2012-05-09 Alternate Designations  1999 RE240 = 1993 OF2 = 1996 AK9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-27 16:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin