+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20440 McClintock (1999 JO31) Classification: Main-belt Asteroid          SPK-ID: 2020440 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1893102192287063 3.958e-08   a 2.429476971505302 7.5723e-09 au q 1.96955215341854 9.472e-08 au i .8597436918995265 3.9694e-06 deg node 185.9280875128329 0.00017937 deg peri 170.5261622544211 0.00017952 deg M 141.0522556652991 7.3013e-06 deg tp 2458658.567568223928 (2019-Jun-24.06756822) 2.7382e-05 TDB period 1383.144668755427 3.79 6.4666e-06 1.77e-08 d yr n .2602764614087209 1.2169e-09 deg/d Q 2.889401789592064 9.0058e-09 au   Orbit Determination Parameters    # obs. used (total)      1990      data-arc span      15894 days (43.52 yr)      first obs. used      1977-09-08      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47121      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:21:02   Additional Information  Earth MOID = .963554 au   Jupiter MOID = 2.55622 au   T_jup = 3.484  [ 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 14.49   n/a E2021B10   diameter diameter 3.669 km 0.699 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.274   0.208 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20440 McClintock           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Shannon Noel McClintock (b. 1989) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her engineering project. She attends the Muirlands Middle School, La Jolla, California. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20041028/MPCPages.arc Last Updated: 2004-10-29 Alternate Designations  1999 JO31 = 1977 RM1 = 1981 TD3 = 1981 UT19 = 2000 QA128  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-18 00:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin