+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22473 Stanleyhey (1997 EN4) Classification: Main-belt Asteroid          SPK-ID: 2022473 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1977218437773958 4.6441e-08   a 2.635463771180013 1.2506e-08 au q 2.114375015133772 1.1851e-07 au i 12.06060594972447 5.1233e-06 deg node 2.101034020627632 1.9497e-05 deg peri 327.7050787776478 2.3494e-05 deg M 62.95588785877532 1.4244e-05 deg tp 2458927.213703682396 (2020-Mar-18.71370368) 6.1268e-05 TDB period 1562.730191257622 4.28 1.1123e-05 3.045e-08 d yr n .230366061917756 1.6397e-09 deg/d Q 3.156552527226254 1.4979e-08 au   Orbit Determination Parameters    # obs. used (total)      1339      data-arc span      8742 days (23.93 yr)      first obs. used      1997-03-02      last obs. used      2021-02-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43937      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:06:46   Additional Information  Earth MOID = 1.1131 au   Jupiter MOID = 2.26472 au   T_jup = 3.339  [ 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 14.65   n/a E2021B10   diameter diameter 6.711 km 0.148 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.057   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22473 Stanleyhey           Discovered 1997 Mar. 2 by Spacewatch at Kitt Peak. James Stanley Hey (1909-2000) was a British radar engineer. In 1942 February, Hey was first to identify radio waves coming from a solar flare. Name suggested and citation prepared by Robert Jedicke and Peter Jedicke. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2016-08-18 Last Updated: 2016-11-23 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 21:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin