+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15281 (1991 PT16) Classification: Main-belt Asteroid          SPK-ID: 2015281 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0677926320155767 5.5742e-08   a 2.911502436306429 1.6166e-08 au q 2.714124023029452 1.6573e-07 au i 2.40222175203057 6.6391e-06 deg node 152.3199109008461 0.00010897 deg peri 168.3533683111509 0.00011653 deg M 308.3534653255998 4.2682e-05 deg tp 2459260.823185450392 (2021-Feb-15.32318545) 0.00021552 TDB period 1814.571826608796 4.97 1.5113e-05 4.138e-08 d yr n .1983939101891569 1.6523e-09 deg/d Q 3.108880849583405 1.7262e-08 au   Orbit Determination Parameters    # obs. used (total)      1598      data-arc span      10592 days (29.00 yr)      first obs. used      1991-08-07      last obs. used      2020-08-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50286      source      ORB      producer      Otto Matic      solution date      2020-Aug-25 00:58:28   Additional Information  Earth MOID = 1.70127 au   Jupiter MOID = 2.09816 au   T_jup = 3.278  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.2   n/a MPO384887   diameter diameter 7.364 km 0.147 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.205   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15281 (1991 PT16)          Discovered 1991-Aug-07 by Holt, H. E. at Palomar Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 PT16 = 1996 TK61  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-27 23:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin