+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11612 Obu (1995 YZ1) Classification: Main-belt Asteroid          SPK-ID: 2011612 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1756310054347962 3.0178e-08   a 2.900312421823104 1.3749e-08 au q 2.390927635103283 9.1572e-08 au i 7.180756510712216 5.2357e-06 deg node 11.19432711899241 2.8559e-05 deg peri 60.12665025447709 3.2825e-05 deg M 353.0996076994302 1.5194e-05 deg tp 2459035.080946977856 (2020-Jul-04.58094698) 7.6168e-05 TDB period 1804.120747018998 4.94 1.2829e-05 3.512e-08 d yr n .1995431850084528 1.4189e-09 deg/d Q 3.409697208542925 1.6164e-08 au   Orbit Determination Parameters    # obs. used (total)      1652      data-arc span      10463 days (28.65 yr)      first obs. used      1992-03-25      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49681      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:46:31   Additional Information  Earth MOID = 1.41486 au   Jupiter MOID = 1.95082 au   T_jup = 3.253  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.6   n/a MPO365389   diameter diameter 6.451 km 0.273 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.169   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   11612 Obu           Discovered 1995 Dec. 21 by A. Nakamura at Kuma Kogen. Obu City (population 76~000), where the discoverer lived for six and a half years, is located in the center of Aichi Prefecture. Known for its automobile industry, Obu is also famous for the 500-year-old "Doburoku Festival", held at Nagakusa-Tenjinsha Shrine. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20000320/MPCPages.arc Last Updated: 2013-03-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-15 19:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin