+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   13965 (1991 PL8) Classification: Main-belt Asteroid          SPK-ID: 2013965 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1564205185697388 3.3264e-08   a 3.097335433780922 1.785e-08 au q 2.612848619044484 1.0022e-07 au i 1.39807686554706 4.5621e-06 deg node 31.03679234639917 0.00015423 deg peri 256.304602488786 0.00015491 deg M 128.4609645891225 1.5051e-05 deg tp 2458290.023911260089 (2018-Jun-20.52391126) 8.1977e-05 TDB period 1991.043682136773 5.45 1.7212e-05 4.712e-08 d yr n .180809694548565 1.563e-09 deg/d Q 3.581822248517362 2.0642e-08 au   Orbit Determination Parameters    # obs. used (total)      1296      data-arc span      10401 days (28.48 yr)      first obs. used      1991-08-05      last obs. used      2020-01-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54263      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 20:48:30   Additional Information  Earth MOID = 1.59693 au   Jupiter MOID = 1.58878 au   T_jup = 3.204  [ 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 14.1   n/a MPO378710   diameter diameter 7.835 km 0.492 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.087   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   13965 (1991 PL8)          Discovered 1991-Aug-05 by Holt, H. E. at Palomar Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 PL8 = 1991 RZ38 = 1995 DN8  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Aug-08 19:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin