+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22911 Johnpardon (1999 TX30) Classification: Main-belt Asteroid          SPK-ID: 2022911 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09280371051459647 3.3456e-08   a 2.205370163028997 6.5506e-09 au q 2.000703628841726 7.387e-08 au i 1.909880211905797 3.4543e-06 deg node 223.1183727538602 0.000109 deg peri 43.72965133209495 0.00011046 deg M 267.9127832592097 1.8033e-05 deg tp 2459506.497244011763 (2021-Oct-18.99724401) 5.999e-05 TDB period 1196.246468761385 3.28 5.3298e-06 1.459e-08 d yr n .3009413272272816 1.3408e-09 deg/d Q 2.410036697216269 7.1585e-09 au   Orbit Determination Parameters    # obs. used (total)      1261      data-arc span      8893 days (24.35 yr)      first obs. used      1996-11-08      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47035      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:14:42   Additional Information  Earth MOID = .983534 au   Jupiter MOID = 2.63735 au   T_jup = 3.655  [ 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 15.19   n/a E2021B10   diameter diameter 2.485 km 0.307 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.314   0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22911 Johnpardon           Discovered 1999 Oct. 4 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. John Vincent Pardon (b. 1989) is a finalist in the 2007 Intel Science Talent Search (STS), a science competition for high school seniors, for his mathematics project. He attends the Durham Academy Upper School, Durham, North Carolina. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20070303/MPCPages.arc Last Updated: 2010-04-12 Alternate Designations  1999 TX30 = 1996 VM21 = 1998 FG54  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-19 23:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin