+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22587 McKennon (1998 HB99) Classification: Main-belt Asteroid          SPK-ID: 2022587 [ 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 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .108367462076909 3.3798e-08   a 2.278882248473124 8.6185e-09 au q 2.031925562833972 7.7315e-08 au i 6.275783322171492 4.1104e-06 deg node 200.5198307282522 3.4729e-05 deg peri 72.63459864640367 4.1392e-05 deg M 165.1255736018149 2.5471e-05 deg tp 2458624.140980966001 (2019-May-20.64098097) 8.7326e-05 TDB period 1256.554283666447 3.44 7.1282e-06 1.952e-08 d yr n .2864977698771367 1.6252e-09 deg/d Q 2.525838934112277 9.5524e-09 au   Orbit Determination Parameters    # obs. used (total)      985      data-arc span      13493 days (36.94 yr)      first obs. used      1984-03-05      last obs. used      2021-02-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .54728      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:07:57   Additional Information  Earth MOID = 1.02484 au   Jupiter MOID = 2.55415 au   T_jup = 3.591  [ 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 15.71   n/a E2021B10   22587 McKennon           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Blanche McKennon mentored a finalist in the 2006 Intel Science Talent Search (STS), a science competition for high school seniors. She teaches at the Moscow High School, Moscow, Idaho. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20060314/MPCPages.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1998 HB99 = 1991 GU13 = 1991 HO2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 03:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin