+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22002 Richardregan (1999 XB42) Classification: Main-belt Asteroid          SPK-ID: 2022002 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1304937252319991 3.8896e-08   a 2.633096479568197 1.1579e-08 au q 2.28949391105408 1.0157e-07 au i 3.378616504536381 3.9811e-06 deg node 244.2057522841343 6.8578e-05 deg peri 279.4470844422468 7.0383e-05 deg M 238.9266344213101 1.8359e-05 deg tp 2459725.361478856284 (2022-May-25.86147886) 8.1507e-05 TDB period 1560.625092770356 4.27 1.0294e-05 2.818e-08 d yr n .2306767984621747 1.5216e-09 deg/d Q 2.976699048082313 1.309e-08 au   Orbit Determination Parameters    # obs. used (total)      1473      data-arc span      22075 days (60.44 yr)      first obs. used      1960-09-24      last obs. used      2021-03-03      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50772      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:57:26   Additional Information  Earth MOID = 1.29982 au   Jupiter MOID = 2.01821 au   T_jup = 3.384  [ 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 14.54   n/a E2021B10   diameter diameter 3.451 km 0.231 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.283   0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22002 Richardregan           Discovered 1999 Dec. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Richard Regan mentored a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition. He teaches at the Stone Middle School, Melbourne, Florida. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20051019/MPCPages.arc Last Updated: 2005-10-26 [ show close-approach data ] Alternate Designations  1999 XB42 = 6306 P-L  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 02:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin