+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   243580 (1997 PG1) Classification: Main-belt Asteroid          SPK-ID: 2243580 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3088168025325007 6.6434e-08   a 2.625063809576629 2.2427e-08 au q 1.814399997459389 1.696e-07 au i 29.00434861135381 1.4459e-05 deg node 318.8359048469176 8.0357e-06 deg peri 68.47934382113996 2.903e-05 deg M 94.75093601880076 2.2469e-05 deg tp 2458591.626247594505 (2019-Apr-18.12624759) 9.6236e-05 TDB period 1553.489147978141 4.25 1.9908e-05 5.451e-08 d yr n .2317364112060508 2.9697e-09 deg/d Q 3.435727621693868 2.9353e-08 au   Orbit Determination Parameters    # obs. used (total)      386      data-arc span      8295 days (22.71 yr)      first obs. used      1997-08-05      last obs. used      2020-04-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48648      source      ORB      producer      Otto Matic      solution date      2020-May-21 12:49:13   Additional Information  Earth MOID = .963823 au   Jupiter MOID = 2.53017 au   T_jup = 3.164  [ 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 15.8   n/a MPO454788   diameter diameter 1.480 km 0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.464   0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   243580 (1997 PG1)          Discovered 1997-Aug-05 by Lopez, A., Pacheco, R. at Mallorca Reference: 20100726/Numbers.arc Last Updated: 2010-07-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-06 14:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin