+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1562653503898316 3.3261e-08   a 3.098003597185291 1.7657e-08 au q 2.613892979562173 1.0025e-07 au i 1.397946198322055 4.3833e-06 deg node 31.03006118945484 0.00015266 deg peri 256.3833164839692 0.0001533 deg M 164.5323510129163 1.4852e-05 deg tp 2458290.230259389453 (2018-Jun-20.73025939) 8.0173e-05 TDB period 1991.687984778579 5.45 1.7027e-05 4.662e-08 d yr n .1807512033768794 1.5453e-09 deg/d Q 3.58211421480841 2.0416e-08 au   Orbit Determination Parameters    # obs. used (total)      1364      data-arc span      10758 days (29.45 yr)      first obs. used      1991-08-05      last obs. used      2021-01-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53498      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:14:02   Additional Information  Earth MOID = 1.59604 au   Jupiter MOID = 1.58799 au   T_jup = 3.203  [ 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 ] 2021-Apr-16 12:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin