+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1913579448128568 3.9294e-08   a 3.130275507624329 1.9348e-08 au q 2.531272419787316 1.2247e-07 au i 21.17952444796101 6.1615e-06 deg node 6.192000736414006 1.1402e-05 deg peri 69.20267458423653 2.2612e-05 deg M 59.46938068936301 1.6224e-05 deg tp 2458866.333287106473 (2020-Jan-17.83328711) 9.096e-05 TDB period 2022.890019152113 5.54 1.8755e-05 5.135e-08 d yr n .177963209364636 1.65e-09 deg/d Q 3.729278595461343 2.3051e-08 au   Orbit Determination Parameters    # obs. used (total)      1140      data-arc span      8039 days (22.01 yr)      first obs. used      1999-03-10      last obs. used      2021-03-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .45583      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:38:14   Additional Information  Earth MOID = 1.62635 au   Jupiter MOID = 1.9891 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 13.98   n/a E2021B55   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 ] 2021-Apr-23 03:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin