+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   6223 Dahl (1980 RD1) Classification: Main-belt Asteroid          SPK-ID: 2006223 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .120967576922666 4.0002e-08   a 2.736051027294431 1.2469e-08 au q 2.405077564185853 1.1192e-07 au i 3.857526822716394 3.685e-06 deg node 294.3075222270876 6.4184e-05 deg peri 75.83799263365614 6.6046e-05 deg M 257.1471687449173 1.7702e-05 deg tp 2459472.778816535972 (2021-Sep-15.27881654) 8.3125e-05 TDB period 1653.045150806656 4.53 1.13e-05 3.094e-08 d yr n .2177798953793406 1.4887e-09 deg/d Q 3.06702449040301 1.3977e-08 au   Orbit Determination Parameters    # obs. used (total)      2202      data-arc span      25843 days (70.75 yr)      first obs. used      1949-12-14      last obs. used      2020-09-15      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46681      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 03:37:26   Additional Information  Earth MOID = 1.40806 au   Jupiter MOID = 2.41893 au   T_jup = 3.338  [ 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 12.7   n/a MPO473852   diameter diameter 19.634 km 0.326 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 3.33 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Waller, E.B. (2013) Minor Planet Bull. 40, 109-110.] geometric albedo albedo 0.033   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   6223 Dahl           Discovered 1980 Sept. 3 by A. Mrkos at Klet. Named in honor of the Welsh-born author Roald Dahl (b. 1916). His Willy Wonka and the Chocolate Factory and James and the Giant Peach are classics of children's literature. Name suggested by G. V. Williams, who made the identifications involving this object. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19960828/MPCPages.arc Last Updated: 2003-09-26 [ show close-approach data ] Alternate Designations  1980 RD1 = 1949 XC = 1972 YS = 1976 UV3 = 1982 BH9 = 1991 AK3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 19:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin