+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1308427176152575 3.1095e-08   a 2.283493082024049 7.7568e-09 au q 1.984714641516383 7.2714e-08 au i 4.578342118767632 3.2936e-06 deg node 271.8913415229193 4.9573e-05 deg peri 13.75071206574168 5.3514e-05 deg M 307.5899009899737 2.3241e-05 deg tp 2459383.989178624112 (2021-Jun-18.48917862) 8.1751e-05 TDB period 1260.369767514525 3.45 6.4221e-06 1.758e-08 d yr n .2856304628045207 1.4554e-09 deg/d Q 2.582271522531716 8.7718e-09 au   Orbit Determination Parameters    # obs. used (total)      1741      data-arc span      11505 days (31.50 yr)      first obs. used      1988-12-11      last obs. used      2020-06-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .51754      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:57:00   Additional Information  Earth MOID = .966707 au   Jupiter MOID = 2.54942 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 14.73   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 [ show close-approach data ] Alternate Designations  1997 RB1 = 1989 EQ4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 02:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin