+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21564 Widmanstatten (1998 QQ101) Classification: Main-belt Asteroid          SPK-ID: 2021564 [ 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 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1810694624271416 7.2657e-09   a 3.096607593491051 1.3964e-08 au q 2.535906521189822 1.9259e-08 au i 16.79642565557056 5.2555e-07 deg node 164.4976765700485 2.8429e-06 deg peri 214.3233252449841 9.203e-06 deg M 16.18849629557051 6.4875e-06 deg tp 2459110.998214771099 (2020-Sep-18.49821477) 3.5833e-05 TDB period 1990.341912807587 5.45 1.3463e-05 3.686e-08 d yr n .1808734457549467 1.2235e-09 deg/d Q 3.65730866579228 1.6493e-08 au   Orbit Determination Parameters    # obs. used (total)      2370      data-arc span      18062 days (49.45 yr)      first obs. used      1971-09-27      last obs. used      2021-03-10      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44772      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:48:25   Additional Information  Earth MOID = 1.55141 au   Jupiter MOID = 1.85744 au   T_jup = 3.133  [ 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 12.66   n/a E2021B10   diameter diameter 18.289 km 0.901 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.058   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   21564 Widmanstätten           Discovered 1998 Aug. 26 by E. W. Elst at the European Southern Observatory. Count Alois von Widmanstätten (1754-1849) was an Austrian chemist who discovered typical patterns by acid etching iron meteorites. These unique Widmanstätten patterns can be used to determine if a piece of iron is in fact a meteorite. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20070402/MPCPages.arc Last Updated: 2007-07-05 [ show close-approach data ] Alternate Designations  1998 QQ101 = 1971 SG3 = 1987 QY9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-20 11:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin