+ 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 97 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5416798820204831 2.6241e-08   a 2.198591329800273 1.8983e-09 au q 1.007658637662804 5.7501e-08 au i 13.5340948148173 5.6658e-06 deg node 82.08580897142748 1.6283e-05 deg peri 204.2630077510122 1.6413e-05 deg M 7.994515526347443 6.4105e-06 deg tp 2458974.057358143310 (2020-May-04.55735814) 2.1173e-05 TDB period 1190.735203032088 3.26 1.5421e-06 4.222e-09 d yr n .3023342209781789 3.9155e-10 deg/d Q 3.389524021937742 2.9265e-09 au   Orbit Determination Parameters    # obs. used (total)      555      data-arc span      12666 days (34.68 yr)      first obs. used      1984-05-27      last obs. used      2019-01-30      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51633      source      ORB      producer      Otto Matic      solution date      2019-Feb-01 08:37:39   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 16.4   n/a MPO435733   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. 2019-August); 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. 46-4, in press.] 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 ] 2020-Jul-15 01:04 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin