+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4147 Lennon (1983 AY) Classification: Main-belt Asteroid          SPK-ID: 2004147 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08069192383529147 3.0674e-08   a 2.361666676037322 7.125e-09 au q 2.171099248490172 7.3472e-08 au i 5.733315968149641 3.3612e-06 deg node 288.5520088428367 3.5219e-05 deg peri 303.3783574439468 4.2327e-05 deg M 359.8133409816934 2.2655e-05 deg tp 2459001.187341879146 (2020-May-31.68734188) 8.3424e-05 TDB period 1325.642225793803 3.63 5.999e-06 1.642e-08 d yr n .271566485281826 1.2289e-09 deg/d Q 2.552234103584471 7.6999e-09 au   Orbit Determination Parameters    # obs. used (total)      2579      data-arc span      17830 days (48.82 yr)      first obs. used      1971-12-16      last obs. used      2020-10-09      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41586      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:54:03   Additional Information  Earth MOID = 1.16577 au   Jupiter MOID = 2.46389 au   T_jup = 3.540  [ 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 13.07   n/a E2021B10   diameter diameter 5.171 km 0.087 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 137. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Hasegawa, S.; Miyasaka, S.; Yoshizumi, C.; Sekiguchi, T.; et al. (2012) arXiv:1204.0548.] geometric albedo albedo 0.240   0.049 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   4147 Lennon (1983 AY)          Discovered 1983-Jan-12 by Skiff, B. A. at Flagstaff Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1983 AY = 1971 YG = 1980 KA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-02 08:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin