+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   501 Urhixidur (A903 BK) Classification: Main-belt Asteroid          SPK-ID: 2000501 [ 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 81 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1412491139507451 3.6603e-08   a 3.163722579808831 1.1306e-08 au q 2.716849568624868 1.188e-07 au i 20.83435933882446 3.8647e-06 deg node 357.2449308700352 1.1192e-05 deg peri 356.117543423871 1.886e-05 deg M 85.13894762450725 1.5826e-05 deg tp 2458514.404282470238 (2019-Jan-30.90428247) 8.9924e-05 TDB period 2055.398418623889 5.63 1.1018e-05 3.017e-08 d yr n .1751485243629912 9.3885e-10 deg/d Q 3.610595590992793 1.2903e-08 au   Orbit Determination Parameters    # obs. used (total)      3639      data-arc span      43035 days (117.82 yr)      first obs. used      1903-01-18      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .32092      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:54:06   Additional Information  Earth MOID = 1.71258 au   Jupiter MOID = 1.83481 au   T_jup = 3.088  [ 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 9.4   n/a MPO502157   diameter diameter 74.457 km 0.628 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 13.1743 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Hills, K. (2013) Minor Planet Bull. 40, 12-13.] [Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; et al. (2015) Planet. Space Sci. 118, 256-266.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.052   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   501 Urhixidur (A903 BK)          Discovered 1903-Jan-18 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1909-Nov-06 09:49 00:01 Jupiter 1.85180015302178 1.85179970347715 1.85180060256767 5.37150022849937 5.28566030393662 2418616.909253585 1.31997983851971 164.510753749776 19.5085636296085 86.2108666278536 5462709.91682606 T 81 CATAB v2.0f-lin.ifort 2020-Dec-18 01:54:16 2020-Dec-18 01:54 1920-Sep-02 06:31 00:01 Jupiter 1.92725428985464 1.92725339824544 1.92725518146922 5.1183517426232 5.03175223184029 2422569.771594822 1.26049316844927 349.282037768668 39.0239955120822 -86.4053396135824 4542553.46710803 T 81 CATAB v2.0f-lin.ifort 2020-Dec-18 01:54:16 2020-Dec-18 01:54 2016-Mar-04 04:17 < 00:01 Jupiter 1.82527707729184 1.82527672685454 1.82527742772914 5.34571558447643 5.25819095932311 2457451.678666397 0.227504119018132 128.313570136199 16.8654688748596 -89.5489064550438 5312884.3378288 T 81 CATAB v2.0f-lin.ifort 2020-Dec-18 01:54:16 2020-Dec-18 01:54 2111-Aug-28 23:20 00:01 Jupiter 1.87993808826895 1.87993732086132 1.87993885567754 5.33279113445369 5.24762268322882 2492326.472198712 1.29305396799413 142.715654285835 33.6340818538851 82.5036137050155 5176295.82110455 T 81 CATAB v2.0f-lin.ifort 2020-Dec-18 01:54:16 2020-Dec-18 01:54 2122-Jun-27 20:56 00:01 Jupiter 1.88144474312875 1.88144405570972 1.88144543055248 5.26600853695347 5.17981177892016 2496282.372267465 1.48501035933619 292.330867708947 29.1003819550033 -86.3287976264021 5169687.42965171 T 81 CATAB v2.0f-lin.ifort 2020-Dec-18 01:54:16 2020-Dec-18 01:54 Alternate Designations  A903 BK = 1943 FC = 1949 FW = 1951 RB2 = 1951 SE = 1955 FB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 18:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin