+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1085757076237878 4.7873e-08   a 3.052896454023422 1.6739e-08 au q 2.721426061225676 1.5071e-07 au i 12.41069878645913 4.6744e-06 deg node 130.5334943144953 1.7288e-05 deg peri 213.1557417016593 2.5848e-05 deg M 13.57223664790361 1.6878e-05 deg tp 2459127.045998204532 (2020-Oct-04.54599820) 9.1559e-05 TDB period 1948.348038158699 5.33 1.6024e-05 4.387e-08 d yr n .1847719159766859 1.5196e-09 deg/d Q 3.384366846821167 1.8556e-08 au   Orbit Determination Parameters    # obs. used (total)      1615      data-arc span      10028 days (27.46 yr)      first obs. used      1993-07-20      last obs. used      2021-01-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49656      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:48:42   Additional Information  Earth MOID = 1.71928 au   Jupiter MOID = 1.99611 au   T_jup = 3.192  [ 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 13.69   n/a E2021B10   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 ] 2021-Apr-11 17:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin