+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20559 Sheridanlamp (1999 RJ118) Classification: Main-belt Asteroid          SPK-ID: 2020559 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1928691335811835 2.8305e-08   a 2.58881250141602 1.0251e-08 au q 2.089510477263776 7.1427e-08 au i 7.414145136290421 5.6181e-06 deg node 166.5506733048739 2.6388e-05 deg peri 124.5660354857751 3.1408e-05 deg M 17.82324178645435 1.5327e-05 deg tp 2458925.175974709183 (2020-Mar-16.67597471) 6.4757e-05 TDB period 1521.42070615362 4.17 9.0362e-06 2.474e-08 d yr n .2366209415606904 1.4054e-09 deg/d Q 3.088114525568264 1.2228e-08 au   Orbit Determination Parameters    # obs. used (total)      1278      data-arc span      9200 days (25.19 yr)      first obs. used      1995-08-24      last obs. used      2020-10-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46724      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:02:06   Additional Information  Earth MOID = 1.0842 au   Jupiter MOID = 2.15153 au   T_jup = 3.383  [ 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 14.7   n/a MPO474035   diameter diameter 3.645 km 0.770 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.175   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20559 Sheridanlamp           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Sheridan Lamp mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. She teaches at the Vernon Middle School, Vernon, Texas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20041028/MPCPages.arc Last Updated: 2004-10-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Nov-27 12:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin