+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20460 Robwhiteley (1999 LO28) Classification: Amor [NEO]          SPK-ID: 2020460 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 246 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4120833912396411 3.5245e-08   a 1.876650522961553 4.3693e-09 au q 1.10331401128791 6.5884e-08 au i 33.94175710391904 6.2794e-06 deg node 280.0728798314668 7.7126e-06 deg peri 283.6692444655432 1.1176e-05 deg M 90.15695939548347 1.1813e-05 deg tp 2458765.336297763548 (2019-Oct-08.83629776) 3.0247e-05 TDB period 939.0171693097703 2.57 3.2794e-06 8.979e-09 d yr n .3833795714988044 1.3389e-09 deg/d Q 2.649987034635195 6.1698e-09 au   Orbit Determination Parameters    # obs. used (total)      1322      data-arc span      24094 days (65.97 yr)      first obs. used      1954-12-30      last obs. used      2020-12-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47022      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 07:25:49   Additional Information  Earth MOID = .329679 au   Jupiter MOID = 2.99872 au   T_jup = 3.681  [ 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 15.2   n/a MPO395199   diameter diameter 2.716 km 0.585 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)   rotation period rot_per 2.7209 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2017) http://www.asu.cas.cz/~ppravec/neo.htm] [Warner, B.D. (2018) Minor Planet Bull. 45, 19-34.] geometric albedo albedo 0.199   0.136 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)   20460 Robwhiteley           Discovered 1999 June 13 by the Catalina Sky Survey. Robert J. Whiteley (b. 1971) is a member of the University of Hawaii Aten Survey and the Catalina Sky Survey. He has also done research into the rotational properties of small, rapidly spinning minor planets and the taxonomic classification of near-earth asteroids. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030106/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 22:53 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin