+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17400 (1985 PL1) Classification: Main-belt Asteroid          SPK-ID: 2017400 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05816016143202798 3.6231e-08   a 2.88306323987566 1.2352e-08 au q 2.715383816425746 1.0281e-07 au i 11.90001078183613 4.9717e-06 deg node 192.0533373434754 1.5604e-05 deg peri 141.8570314778867 4.2895e-05 deg M 70.47746319341948 4.0264e-05 deg tp 2458850.452127370206 (2020-Jan-01.95212737) 0.00019953 TDB period 1788.050086321666 4.90 1.1491e-05 3.146e-08 d yr n .2013366419397028 1.2939e-09 deg/d Q 3.050742663325574 1.3071e-08 au   Orbit Determination Parameters    # obs. used (total)      1440      data-arc span      12956 days (35.47 yr)      first obs. used      1985-08-13      last obs. used      2021-02-01      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47404      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:02:32   Additional Information  Earth MOID = 1.71582 au   Jupiter MOID = 2.18551 au   T_jup = 3.259  [ 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 14.3   n/a MPO347660   diameter diameter 7.685 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.069   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17400 (1985 PL1)          Discovered 1985-Aug-13 by Oak Ridge Observatory at Harvard Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1985 PL1 = 1985 QH2 = 1985 QY3 = 1988 CK7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-21 03:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin