+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21676 Maureenanne (1999 RB23) Classification: Main-belt Asteroid          SPK-ID: 2021676 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1590535746144857 3.0322e-08   a 2.975778536574172 1.3699e-08 au q 2.502470323070987 8.8026e-08 au i 11.4062479220283 3.2984e-06 deg node 174.5950668389617 1.8401e-05 deg peri 218.2505542449666 2.2148e-05 deg M 27.92031652835444 1.1282e-05 deg tp 2459055.082332552118 (2020-Jul-24.58233255) 5.8917e-05 TDB period 1874.991647321518 5.13 1.2948e-05 3.545e-08 d yr n .1920008553180868 1.3259e-09 deg/d Q 3.449086750077357 1.5878e-08 au   Orbit Determination Parameters    # obs. used (total)      1753      data-arc span      18248 days (49.96 yr)      first obs. used      1971-03-25      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48412      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:51:32   Additional Information  Earth MOID = 1.5169 au   Jupiter MOID = 2.04329 au   T_jup = 3.212  [ 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 13.72   n/a E2021B10   diameter diameter 10.865 km 1.782 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.054   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   21676 Maureenanne           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Maureen Anne Williams (b. 1989) was awarded second place in the 2006 Intel International Science and Engineering Fair for her environmental sciences team project. She attends the Bishop Moore Catholic High School, Orlando, Florida, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20060711/MPCPages.arc Last Updated: 2006-07-17 Alternate Designations  1999 RB23 = 2087 T-1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-16 12:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin