+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18462 Ricco (1995 QS2) Classification: Main-belt Asteroid          SPK-ID: 2018462 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08586138614955686 5.3772e-08   a 2.901596101793074 1.2001e-08 au q 2.65246103844697 1.5519e-07 au i 2.310396878765633 5.5064e-06 deg node 162.492633916686 8.1361e-05 deg peri 202.5882529316628 8.4265e-05 deg M 12.95909251301278 1.9772e-05 deg tp 2459135.513079914317 (2020-Oct-13.01307991) 9.9215e-05 TDB period 1805.318636884006 4.94 1.12e-05 3.066e-08 d yr n .1994107813684141 1.2371e-09 deg/d Q 3.150731165139178 1.3031e-08 au   Orbit Determination Parameters    # obs. used (total)      1415      data-arc span      12522 days (34.28 yr)      first obs. used      1986-10-31      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50989      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:29:38   Additional Information  Earth MOID = 1.64888 au   Jupiter MOID = 2.28088 au   T_jup = 3.280  [ 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 14.38   n/a E2021B10   diameter diameter 3.906 km 0.208 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.153   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18462 Riccò           Discovered 1995 Aug. 26 at Osservatorio San Vittore. Italian astronomer Annibale Riccò (1844-1919) was an assistant at the observatory of Modena and later astronomer and successively director of the observatories of Palermo and Catania. He was interested in solar spectroscopy, meteorology and seismology. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20020427/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  1995 QS2 = 1999 JV13 = 2000 QK46  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-19 01:31 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin