+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3947 Swedenborg (1983 XD) Classification: Main-belt Asteroid          SPK-ID: 2003947 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1480244100731235 1.6166e-08   a 3.097722064553157 1.4637e-08 au q 2.639183583377178 5.2011e-08 au i 5.38002399016464 8.0242e-07 deg node 253.8838591180736 9.3646e-06 deg peri 99.90267698663857 1.3502e-05 deg M 20.55439229355387 6.6557e-06 deg tp 2459282.799011363811 (2021-Mar-09.29901136) 3.6632e-05 TDB period 1991.416497478492 5.45 1.4114e-05 3.864e-08 d yr n .1807758449605232 1.2813e-09 deg/d Q 3.556260545729136 1.6804e-08 au   Orbit Determination Parameters    # obs. used (total)      2509      data-arc span      24025 days (65.78 yr)      first obs. used      1955-09-17      last obs. used      2021-06-27      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44363      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 14:12:20   Additional Information  Earth MOID = 1.64034 au   Jupiter MOID = 1.94108 au   T_jup = 3.199  [ 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 12.27   n/a E2021B10   diameter diameter 15.524 km 0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 38.557 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: [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.090   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   3947 Swedenborg (1983 XD)          Discovered 1983-Dec-01 by Bowell, E. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1983 XD = 1955 SP  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-19 04:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin