+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1758979350105802 2.5885e-08   a 2.900860027856168 1.2088e-08 au q 2.390604739201534 7.6429e-08 au i 7.181063093940774 4.4285e-06 deg node 11.18351403583864 2.8402e-05 deg peri 60.09576951424162 3.2529e-05 deg M 72.12059491266288 1.4249e-05 deg tp 2459034.969129200946 (2020-Jul-04.46912920) 7.1572e-05 TDB period 1804.63172336932 4.94 1.128e-05 3.088e-08 d yr n .1994866849219882 1.2469e-09 deg/d Q 3.411115316510803 1.4214e-08 au   Orbit Determination Parameters    # obs. used (total)      1981      data-arc span      10667 days (29.20 yr)      first obs. used      1992-03-25      last obs. used      2021-06-08      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46809      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 02:44:57   Additional Information  Earth MOID = 1.41428 au   Jupiter MOID = 1.95083 au   T_jup = 3.252  [ 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 13.63   n/a MPCxxxxx   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-Aug-03 18:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin