+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .192629859553772 2.7878e-08   a 2.587920332350765 1.0119e-08 au q 2.089409602193686 7.007e-08 au i 7.415183649796472 5.559e-06 deg node 166.5498842598698 2.6108e-05 deg peri 124.5135972848382 3.1115e-05 deg M 65.22095902793488 1.5335e-05 deg tp 2458925.007702656630 (2020-Mar-16.50770266) 6.4706e-05 TDB period 1520.634294891835 4.16 8.919e-06 2.442e-08 d yr n .236743312451471 1.3886e-09 deg/d Q 3.086431062507844 1.2069e-08 au   Orbit Determination Parameters    # obs. used (total)      1344      data-arc span      9303 days (25.47 yr)      first obs. used      1995-08-24      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46358      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:23:51   Additional Information  Earth MOID = 1.08219 au   Jupiter MOID = 2.15219 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 14.75   n/a E2021B10   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 ] 2021-Apr-18 20:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin