+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4801 Ohre (1989 UR4) Classification: Main-belt Asteroid          SPK-ID: 2004801 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1628263559168607 1.7031e-08   a 2.64294689737282 8.3385e-09 au q 2.212605485191831 4.579e-08 au i 2.253994304740021 8.2187e-07 deg node 66.5885770539456 1.4563e-05 deg peri 44.78410580301304 1.4844e-05 deg M 29.29349191781173 4.2167e-06 deg tp 2459072.797403770351 (2020-Aug-11.29740377) 1.8197e-05 TDB period 1569.390729232929 4.30 7.4271e-06 2.033e-08 d yr n .2293883819333871 1.0856e-09 deg/d Q 3.07328830955381 9.6962e-09 au   Orbit Determination Parameters    # obs. used (total)      2762      data-arc span      12872 days (35.24 yr)      first obs. used      1985-12-17      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43934      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 16:47:57   Additional Information  Earth MOID = 1.22981 au   Jupiter MOID = 2.03906 au   T_jup = 3.374  [ 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 13.04   n/a E2021B10   diameter diameter 13.961 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 32.000 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Klinglesmith III, D.A. (2012) Minor Planet Bull. 39, 109-110.] [Owings, L.E. (2013) Minor Planet Bull. 40, 8-10.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.091   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   4801 Ohře           Discovered 1989 Oct. 22 by A. Mrkos at Klet. Named for a Czech river rising in Germany near the Czech border and continuing through the towns of Karlovy Vary, Žatec and Louny to its confluence with the Labe river. Name proposed by Z. Moravec. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19990402/MPCPages.arc Last Updated: 2010-06-11 Alternate Designations  1989 UR4 = 1939 BE = 1952 DA1 = 1985 YQ1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-19 04:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin