+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   42487 Angstrom (1991 RY2) Classification: Main-belt Asteroid          SPK-ID: 2042487 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1359931566415876 4.9157e-08   a 2.480702780146236 1.2278e-08 au q 2.143344178384587 1.2565e-07 au i 3.842749768957876 4.7164e-06 deg node 279.5622039817457 7.3016e-05 deg peri 61.7805370654655 7.6871e-05 deg M 191.0857013129708 2.732e-05 deg tp 2459870.113869595452 (2022-Oct-17.61386960) 0.00011052 TDB period 1427.120113146903 3.91 1.0595e-05 2.901e-08 d yr n .2522562723933405 1.8728e-09 deg/d Q 2.818061381907884 1.3948e-08 au   Orbit Determination Parameters    # obs. used (total)      855      data-arc span      10780 days (29.51 yr)      first obs. used      1991-09-09      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .55057      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 09:09:10   Additional Information  Earth MOID = 1.13617 au   Jupiter MOID = 2.55741 au   T_jup = 3.463  [ 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 15.13   n/a E2021B10   42487 Ångström           Discovered 1991 Sept. 9 by F. Börngen and L. D. Schmadel at Tautenburg. Swedish physicist Anders Jonas Ångström (1814-1874) is a cofounder of astrospectroscopy. He measured the wavelengths of about 1000 Fraunhofer lines, discovering among them some hydrogen lines. The `angstrom', a unit of length equal to the 10-10 meters, was named for him. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030106/MPCPages.arc Last Updated: 2003-10-02 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-15 07:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin