+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3671 Dionysus (1984 KD) Classification: Apollo [NEO, PHA]          SPK-ID: 2003671 [ 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 127 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5416798954748616 2.095e-08   a 2.198591327707204 1.819e-09 au q 1.007658607122829 4.5791e-08 au i 13.53409416976959 4.7285e-06 deg node 82.0857875043333 1.4189e-05 deg peri 204.2630377663351 1.46e-05 deg M 7.994518713463725 6.1727e-06 deg tp 2458974.057347639371 (2020-May-04.55734764) 2.0388e-05 TDB period 1190.735201331711 3.26 1.4777e-06 4.046e-09 d yr n .3023342214099141 3.7519e-10 deg/d Q 3.38952404829158 2.8042e-09 au   Orbit Determination Parameters    # obs. used (total)      732      data-arc span      13377 days (36.62 yr)      first obs. used      1984-05-27      last obs. used      2021-01-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51296      source      ORB      producer      Otto Matic      solution date      2021-Jan-11 05:22:01   Additional Information  Earth MOID = .0206816 au   Jupiter MOID = 1.83881 au   T_jup = 3.429  [ 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 16.48   n/a E2021B10   diameter diameter 1.5 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130   rotation period rot_per 2.7053 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Mottola, S.; Hahn, G.; Pravec, P.; Sarounova, L. (1997) IAUC 6680; http://www.eso.org/outreach/press-rel/pr-1997/pr-08-97.html.] [Pravec, P.; et al. (2006) Icarus 181, 63-93.] [Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46, 458-503.] geometric albedo albedo 0.16   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130   SMASSII spectral type spec_B Cb   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 3671 Dionysus (1984 KD)          Discovered 1984-May-27 by Shoemaker, C. and Shoemaker, E. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-01 15:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin