+ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1756309985123291 3.2136e-08   a 2.90031242512339 1.4653e-08 au q 2.390927657901254 9.8471e-08 au i 7.180755206234532 5.6867e-06 deg node 11.19432911659148 2.8787e-05 deg peri 60.1266516683489 3.3275e-05 deg M 353.0996033969686 1.6179e-05 deg tp 2459035.080968598437 (2020-Jul-04.58096860) 8.1135e-05 TDB period 1804.120750098381 4.94 1.3672e-05 3.743e-08 d yr n .1995431846678604 1.5122e-09 deg/d Q 3.409697192345526 1.7226e-08 au   Orbit Determination Parameters    # obs. used (total)      1538      data-arc span      10169 days (27.84 yr)      first obs. used      1992-03-25      last obs. used      2020-01-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50232      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 20:06:00   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 ] 2020-Oct-23 22:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin