+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11711 Urquiza (1998 HV50) Classification: Main-belt Asteroid          SPK-ID: 2011711 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1083378127661578 1.5938e-08   a 2.369172712077934 6.7938e-09 au q 2.112501722386144 3.9562e-08 au i 2.903160301162577 1.2537e-06 deg node 273.40929346874 6.4314e-06 deg peri 54.29097267169546 1.3009e-05 deg M 326.2375700917946 1.1905e-05 deg tp 2459325.417908560664 (2021-Apr-20.91790856) 4.4199e-05 TDB period 1331.967136373373 3.65 5.7293e-06 1.569e-08 d yr n .2702769386489471 1.1626e-09 deg/d Q 2.625843701769723 7.5298e-09 au   Orbit Determination Parameters    # obs. used (total)      2273      data-arc span      14167 days (38.79 yr)      first obs. used      1981-11-24      last obs. used      2020-09-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47958      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 22:55:33   Additional Information  Earth MOID = 1.10048 au   Jupiter MOID = 2.64908 au   T_jup = 3.536  [ 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 14.19   n/a E2021B10   diameter diameter 3.835 km 0.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.302   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   11711 Urquiza           Discovered 1998 Apr. 25 by LONEOS at the Anderson Mesa Station of the Lowell Observatory. Luis Urquiza del Valle (1906-2000) was the much-loved grandfather of LONEOS observer L. Levy. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010705/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1998 HV50 = 1981 WW5 = 1994 EN2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-May-08 20:55 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin