+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15381 Spadolini (1997 RB1) Classification: Main-belt Asteroid          SPK-ID: 2015381 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1308046157022097 3.1102e-08   a 2.283814505072127 7.7868e-09 au q 1.985081026401035 7.2727e-08 au i 4.578341423415746 3.2989e-06 deg node 271.8942554082769 4.9576e-05 deg peri 13.68239524500592 5.3518e-05 deg M 250.5314534928822 2.3123e-05 deg tp 2459383.833273807257 (2021-Jun-18.33327381) 8.1772e-05 TDB period 1260.635890160829 3.45 6.4473e-06 1.765e-08 d yr n .2855701656677981 1.4605e-09 deg/d Q 2.582547983743219 8.8054e-09 au   Orbit Determination Parameters    # obs. used (total)      1727      data-arc span      11459 days (31.37 yr)      first obs. used      1988-12-11      last obs. used      2020-04-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51631      source      ORB      producer      Otto Matic      solution date      2020-May-20 04:10:52   Additional Information  Earth MOID = .968988 au   Jupiter MOID = 2.54983 au   T_jup = 3.588  [ 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 14.7   n/a MPO358780   diameter diameter 3.028 km 0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.305   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15381 Spadolini           Discovered 1997 Sept. 1 by V. Goretti at Pianoro. Mauro (b. 1941) and Barbara (b. 1944) Spadolini, long-standing friends of the discoverer, are dedicated secondary-school teachers who believe in cross-curricular work and in developing the human mind by arousing passion for knowledge and exploration. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20001013/MPCPages.arc Last Updated: 2013-03-29 [ show close-approach data ] Alternate Designations  1997 RB1 = 1989 EQ4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 23:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin