+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   24268 Charconley (1999 XN156) Classification: Main-belt Asteroid          SPK-ID: 2024268 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .00512396821884921 5.4129e-08   a 2.809795421754125 1.4517e-08 au q 2.795398119311589 1.5137e-07 au i 4.225513786089603 5.9655e-06 deg node 184.6221706852272 4.8013e-05 deg peri 3.1449430542559 0.0003623 deg M 60.38529814096743 0.0003576 deg tp 2458911.937965177673 (2020-Mar-03.43796518) 0.0017094 TDB period 1720.32490911162 4.71 1.3333e-05 3.65e-08 d yr n .2092627957040422 1.6218e-09 deg/d Q 2.824192724196661 1.4592e-08 au   Orbit Determination Parameters    # obs. used (total)      1084      data-arc span      9829 days (26.91 yr)      first obs. used      1993-08-14      last obs. used      2020-07-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53905      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:41:07   Additional Information  Earth MOID = 1.78999 au   Jupiter MOID = 2.12994 au   T_jup = 3.318  [ 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 14.51   n/a E2021B10   diameter diameter 7.764 km 0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.056   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   24268 Charconley           Discovered 1999 Dec. 8 by the Lincoln Laboratory Near-Earth Asteroid Research Team in Socorro. Charles Conley mentored a finalist in the 2008 Intel Science Talent Search (STS), a science competition for high school seniors. He teaches at the Texas Academy of Mathematics & Science, Denton, Texas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20080221/MPCPages.arc Last Updated: 2008-03-05 Alternate Designations  1999 XN156 = 1998 RQ30  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-05 01:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin