+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1084214082442814 4.6775e-08   a 3.052555511950454 1.6564e-08 au q 2.721593144600942 1.4751e-07 au i 12.41069577049777 4.5044e-06 deg node 130.5334147051963 1.7115e-05 deg peri 213.1873906490714 2.5584e-05 deg M 49.77379211056452 1.6655e-05 deg tp 2459127.165485029008 (2020-Oct-04.66548503) 9.0885e-05 TDB period 1948.021665180241 5.33 1.5856e-05 4.341e-08 d yr n .1848028727989998 1.5042e-09 deg/d Q 3.383517879299966 1.836e-08 au   Orbit Determination Parameters    # obs. used (total)      1641      data-arc span      10067 days (27.56 yr)      first obs. used      1993-07-20      last obs. used      2021-02-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49551      source      ORB      producer      Otto Matic      solution date      2021-Jul-09 10:11:30   Additional Information  Earth MOID = 1.72056 au   Jupiter MOID = 1.99655 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 13.70   n/a MPCxxxxx   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-Aug-05 06:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin