+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1082115572959517 3.3979e-08   a 2.368326546963566 7.1032e-09 au q 2.112046243131294 8.2846e-08 au i 2.903639462244486 3.1644e-06 deg node 273.4087456047334 7.0609e-05 deg peri 54.47175192056559 7.2081e-05 deg M 271.9896753671341 1.536e-05 deg tp 2459325.955731115470 (2021-Apr-21.45573112) 5.7094e-05 TDB period 1331.253619280666 3.64 5.9892e-06 1.64e-08 d yr n .2704218000132262 1.2166e-09 deg/d Q 2.624606850795837 7.8719e-09 au   Orbit Determination Parameters    # obs. used (total)      2246      data-arc span      14167 days (38.79 yr)      first obs. used      1981-11-24      last obs. used      2020-09-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .4798      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:57:45   Additional Information  Earth MOID = 1.10201 au   Jupiter MOID = 2.65152 au   T_jup = 3.537  [ 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 14.1   n/a MPO337357   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-Jan-19 03:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin