+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101722 Pursell (1999 EX4) Classification: Main-belt Asteroid          SPK-ID: 2101722 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1912911621565886 4.2264e-08   a 3.130346236888679 2.1395e-08 au q 2.531538667281739 1.3473e-07 au i 21.17793683338106 6.4044e-06 deg node 6.198076964982532 1.2601e-05 deg peri 69.22967504225147 2.3598e-05 deg M 23.85745326929234 1.6306e-05 deg tp 2458866.437111633054 (2020-Jan-17.93711163) 9.1618e-05 TDB period 2022.958581007505 5.54 2.074e-05 5.678e-08 d yr n .1779571778581385 1.8244e-09 deg/d Q 3.729153806495618 2.5488e-08 au   Orbit Determination Parameters    # obs. used (total)      976      data-arc span      7896 days (21.62 yr)      first obs. used      1999-03-10      last obs. used      2020-10-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46389      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 19:58:51   Additional Information  Earth MOID = 1.62727 au   Jupiter MOID = 1.98941 au   T_jup = 3.082  [ 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 13.9   n/a MPO270554   diameter diameter 9.964 km 0.256 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.054   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101722 Pursell           Discovered 1999 Mar. 10 by W. R. Cooney Jr. at Baton Rouge. Wallace Pursell (b. 1929) is a co-founder of the Baton Rouge Astronomical Society and a lifelong amateur astronomer. He is an Eagle Scout and earned his BA in Geology from Ohio Wesleyan University. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2013-07-22 Last Updated: 2014-08-13 [ show close-approach data ] Alternate Designations  1999 EX4 = 2002 RU60  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Dec-01 00:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin