+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   48495 Ryugado (1993 BB) Classification: Main-belt Asteroid          SPK-ID: 2048495 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1396915943409244 4.7776e-08   a 2.297847268935573 6.8163e-09 au q 1.976857320386024 1.1022e-07 au i 5.801989522652741 4.5443e-06 deg node 144.5778503053618 3.3099e-05 deg peri 24.42915179849108 3.4875e-05 deg M 339.4375472941517 1.1069e-05 deg tp 2459273.169568442187 (2021-Feb-27.66956844) 3.9232e-05 TDB period 1272.272574358151 3.48 5.6611e-06 1.55e-08 d yr n .2829582333656894 1.259e-09 deg/d Q 2.618837217485122 7.7685e-09 au   Orbit Determination Parameters    # obs. used (total)      1149      data-arc span      23994 days (65.69 yr)      first obs. used      1955-05-17      last obs. used      2021-01-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52529      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 04:56:27   Additional Information  Earth MOID = .984944 au   Jupiter MOID = 2.35029 au   T_jup = 3.574  [ 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 15.4   n/a MPO502479   diameter diameter 1.917 km 0.267 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.400   0.123 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   48495 Ryugado           Discovered 1993 Jan. 16 by T. Seki at Geisei. Ryugado, in Kochi prefecture, is one of the Three Greatest Limestone Caves of Japan and has been designated a National Historic Site, as well as a National Natural Treasure. Earthenware from the Yayoi Period (300 B.C.-A.D. 300), evidence of cave dwelling, was uncovered in this 4-km-long cave. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20070730/MPCPages.arc Last Updated: 2007-08-07 [ show close-approach data ] Alternate Designations  1993 BB = 1999 YH16  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 03:36 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin