+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19810 Partridge (2000 SP112) Classification: Main-belt Asteroid          SPK-ID: 2019810 [ 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 27 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01105798305550323 4.022e-08   a 3.080428624899328 2.0339e-08 au q 3.046365297361504 1.1805e-07 au i 5.989893904013032 4.8861e-06 deg node 20.44520440099716 4.2397e-05 deg peri 83.44161069787971 0.00023652 deg M 186.8363043137095 0.00023328 deg tp 2460150.381649531430 (2023-Jul-24.88164953) 0.0012816 TDB period 1974.763777569271 5.41 1.9558e-05 5.355e-08 d yr n .1823002852741823 1.8055e-09 deg/d Q 3.114491952437152 2.0564e-08 au   Orbit Determination Parameters    # obs. used (total)      1246      data-arc span      8560 days (23.44 yr)      first obs. used      1997-03-04      last obs. used      2020-08-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55599      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:07:26   Additional Information  Earth MOID = 2.07047 au   Jupiter MOID = 1.8705 au   T_jup = 3.220  [ 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 13.8   n/a MPO319332   diameter diameter 9.365 km 0.231 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.046   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19810 Partridge           Discovered 2000 Sept. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Mary Partridge mentored a finalist in the 2003 Discovery Channel Youth Science Challenge, a middle school science competition. She teaches at the St. Joseph School, Athens, Georgia. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20031010/MPCPages.arc Last Updated: 2003-10-10 [ show close-approach data ] Alternate Designations  2000 SP112 = 1997 EC33 = 1998 HV153  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 16:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin