+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15058 Billcooke (1998 YL16) Classification: Main-belt Asteroid          SPK-ID: 2015058 [ 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 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1765734547323979 4.1977e-08   a 3.082640159562215 1.6178e-08 au q 2.538327736891485 1.3218e-07 au i 5.828317635479303 3.8856e-06 deg node 123.823691281708 4.8802e-05 deg peri 283.6147513104615 5.0296e-05 deg M 35.01607636951118 1.1054e-05 deg tp 2458808.214004589125 (2019-Nov-20.71400459) 6.0789e-05 TDB period 1976.89077489527 5.41 1.5563e-05 4.261e-08 d yr n .182104142814401 1.4336e-09 deg/d Q 3.626952582232946 1.9035e-08 au   Orbit Determination Parameters    # obs. used (total)      1426      data-arc span      9934 days (27.20 yr)      first obs. used      1992-11-18      last obs. used      2020-01-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51027      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 21:09:42   Additional Information  Earth MOID = 1.55625 au   Jupiter MOID = 1.79247 au   T_jup = 3.195  [ 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 13.7   n/a MPO452383   diameter diameter 9.284 km 0.087 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.118   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15058 Billcooke           Discovered 1998 Dec. 22 by Spacewatch at Kitt Peak. William Joe Cooke, Jr., (b. 1958) studied at Valdosta State University and the University of Florida. Cooke generates custom meteor activity forecasts. The name was suggested by R. Jedicke and P. Jedicke. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050523/MPCPages.arc Last Updated: 2005-07-21 [ show close-approach data ] Alternate Designations  1998 YL16 = 1992 WV9 = 1994 CA13  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 05:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin