+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15214 (1981 DY) Classification: Main-belt Asteroid          SPK-ID: 2015214 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1445072315824623 3.996e-08   a 2.779699819104129 1.2159e-08 au q 2.37801309361512 1.0941e-07 au i 6.258801138982125 3.5475e-06 deg node 284.8326849792597 3.8254e-05 deg peri 326.7249525405696 4.0331e-05 deg M 189.9424035078929 1.3986e-05 deg tp 2460196.129505966569 (2023-Sep-08.62950597) 6.7703e-05 TDB period 1692.759559619707 4.63 1.1106e-05 3.041e-08 d yr n .2126704870483065 1.3954e-09 deg/d Q 3.181386544593138 1.3916e-08 au   Orbit Determination Parameters    # obs. used (total)      1473      data-arc span      24297 days (66.52 yr)      first obs. used      1954-07-03      last obs. used      2021-01-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49652      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 17:25:24   Additional Information  Earth MOID = 1.36659 au   Jupiter MOID = 1.89163 au   T_jup = 3.310  [ 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 14.18   n/a E2021B10   diameter diameter 8.584 km 0.082 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.078   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15214 (1981 DY)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1981 DY = 1954 NC1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Aug-01 17:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin