+ 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 ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1310524577851906 3.1059e-08   a 2.283988520227017 6.5833e-09 au q 1.984666211098106 7.2549e-08 au i 4.577890062662289 3.2906e-06 deg node 271.8910916113052 4.4748e-05 deg peri 13.74541535366063 4.7115e-05 deg M 3.578692728759278 1.5462e-05 deg tp 2459383.966821872989 (2021-Jun-18.46682187) 5.415e-05 TDB period 1260.77997405722 3.45 5.451e-06 1.492e-08 d yr n .2855375302651036 1.2345e-09 deg/d Q 2.583310829355928 7.446e-09 au   Orbit Determination Parameters    # obs. used (total)      1852      data-arc span      11887 days (32.54 yr)      first obs. used      1988-12-11      last obs. used      2021-06-28      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50843      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 03:49:09   Additional Information  Earth MOID = .96829 au   Jupiter MOID = 2.54733 au   T_jup = 3.588  [ 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 14.73   n/a E2021B10   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 Alternate Designations  1997 RB1 = 1989 EQ4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-01 17:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin