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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457535.5 (2016-May-27.0) TDB
Reference: JPL 127 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5412608629881659 2.0958e-08  
q 1.008876382887722 4.5827e-08 au
tp 2457782.967968931223
(2017-Jan-29.46796893)		 1.9167e-05 TDB
node 82.10801251896007 1.419e-05 deg
peri 204.2234201375509 1.46e-05 deg
i 13.53121905130603 4.7275e-06 deg
   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
 Jupiter MOID = 1.83881 au 
 T_jup = 3.429 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.392410709314282E-16 -9.602920453579783E-16 6.295462682249928E-14 5.753652767543525E-14 -4.873125603594818E-14 -5.33159190268767E-15
q -9.602920453579783E-16 2.100071675532717E-15 -1.248223139057756E-13 -1.213868362872711E-13 1.052869315653255E-13 1.065602079189418E-14
tp 6.295462682249928E-14 -1.248223139057756E-13 3.673628000326784E-10 3.594207885967988E-11 5.887096799105358E-11 -2.721132056463249E-12
node 5.753652767543525E-14 -1.213868362872711E-13 3.594207885967988E-11 2.013500365148831E-10 -1.898939831443102E-10 -2.245378619077664E-11
peri -4.873125603594818E-14 1.052869315653255E-13 5.887096799105358E-11 -1.898939831443102E-10 2.131703607810183E-10 2.161764101046997E-11
i -5.33159190268767E-15 1.065602079189418E-14 -2.721132056463249E-12 -2.245378619077664E-11 2.161764101046997E-11 2.234948655792235E-11

[ 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. 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.DBLast Updated: 2003-08-29

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