+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18024 Dobson (1999 KK4) Classification: Main-belt Asteroid          SPK-ID: 2018024 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06671518898306796 3.7782e-08   a 3.184585468120006 1.975e-08 au q 2.972125246781648 1.1939e-07 au i 9.552418236581259 4.4247e-06 deg node 182.5430349632067 2.2249e-05 deg peri 43.05729545100431 3.6868e-05 deg M 298.6547602543054 2.8975e-05 deg tp 2459554.217183040939 (2021-Dec-05.71718304) 0.00016726 TDB period 2075.763114181569 5.68 1.931e-05 5.287e-08 d yr n .173430194197251 1.6133e-09 deg/d Q 3.397045689458364 2.1067e-08 au   Orbit Determination Parameters    # obs. used (total)      1388      data-arc span      10155 days (27.80 yr)      first obs. used      1993-03-29      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55155      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:36:23   Additional Information  Earth MOID = 1.97177 au   Jupiter MOID = 1.58522 au   T_jup = 3.173  [ 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 13.94   n/a E2021B10   diameter diameter 5.243 km 0.337 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.213   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18024 Dobson           Discovered 1999 May 20 by J. M. Roe at Oaxaca. John Dobson (b. 1915) is one of the most important popularizers of astronomy of the twentieth century. His telescope design has spread around the world and enabled amateur astronomers to use larger apertures than before. He demonstrates a passion for sharing his knowledge of the universe with the public at large. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20011101/MPCPages.arc Last Updated: 2009-05-11 [ show close-approach data ] Alternate Designations  1999 KK4 = 1995 UD27  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-11 22:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin