+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21073 Darksky (1991 RE) Classification: Main-belt Asteroid          SPK-ID: 2021073 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2244083024128127 4.7736e-08   a 2.579854870754862 1.2082e-08 au q 2.000914018737337 1.2814e-07 au i 2.924653990768716 3.1926e-06 deg node 295.9429792319077 8.2933e-05 deg peri 67.32168712816468 8.326e-05 deg M 12.74115558465478 5.9231e-06 deg tp 2459146.932958829432 (2020-Oct-24.43295883) 2.493e-05 TDB period 1513.531068141875 4.14 1.0632e-05 2.911e-08 d yr n .2378543840807729 1.6709e-09 deg/d Q 3.158795722772386 1.4793e-08 au   Orbit Determination Parameters    # obs. used (total)      1203      data-arc span      24157 days (66.14 yr)      first obs. used      1954-11-23      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47682      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:50:46   Additional Information  Earth MOID = .999119 au   Jupiter MOID = 2.3162 au   T_jup = 3.387  [ 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 15.03   n/a E2021B10   21073 Darksky           Discovered 1991 Sept. 4 by R. H. McNaught at Siding Spring. Part of a worldwide initiative, Dark Sky Scotland promotes the use of Scotland's dark rural areas for astronomy outreach. Its events encourage the public to enjoy the night sky and learn how astronomers are exploring the wonders of the Universe. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20091004/MPCPages.arc Last Updated: 2009-10-06 [ show close-approach data ] Alternate Designations  1991 RE = 1999 NM15  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 06:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin