(3671) Dionysus and S/1997 (3671) 1

compiled by Wm. Robert Johnston
last updated 25 November 2008

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 2.19797191942117 AU
orbital period P: 3.2587 y (=1190.3 d)
eccentricity e: 0.541689705094077
perihelion distance q: 1.00735315858485 AU
aphelion distance Q: 3.38859068 AU
inclination i: 13.5468044169779°
argument of perihelion omega: 204.20549062558°
ascending node OMEGA: 82.2010747339807°
mean anomaly M: 114.423197697378°
perihelion passage TP: 2004-01-17.6940115
Epoch: 30 JAN 2005
data arc: 1984-2004 (209 obs.)

orbital data, secondary:
semimajor axis a: (3.6 km)
semimajor axis/primary radius a/Rp: 4.8 +0.8/-0.4 [P05a]
orbital period P: 27.72 ± 0.02 h [P05a]
eccentricity e: 0.07 +0.03/-0.07 [P05a]

other data, primary:
diameter: 1.5 km [H03b]
absolute magnitude H: 16.3 [SBc]
rotation period: 2.7053 h [OOa]
amplitude delta M: 0.14-0.26 [MPb]
color index B-V: 0.68 [P98a]
color index V-R: 0.39 [P98a]
color index R-I: 0.39 [P98a]
slope parameter G: (0.15) assumed
geometric albedo: (0.16) assumed
mass: ?
density: (1.6 +0.9/-0.4) g/cm3 [P05a]
type: Cb [SBd]; EM [OOa]

other data, secondary:
diameter: (0.3 km)
diameter ratio Ds/Dp: 0.20 ± 0.02 [P05a]
component magnitude difference: ?
rotation period: ?

--(3671) Dionysus--discovery and notes:

Primary discovered 27 May 1984 from Palomar Observatory, California, USA, by C. S. Shoemaker and E. M. Shoemaker. Also designated 1984 KD.

Companion discovered by S. Mottola, G. Hahn, P. Pravec, and L. Sarounova in lightcurve observations 30 May-8 June 1997 from European Southern Observatory in La Silla and from Ondrejov; announced 10 June 1997.

(3671) Dionysus is an Amor asteroid with a perihelion just inside the Earth's aphelion distance.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2001-2005, 2008 by Wm. Robert Johnston.
Last modified 25 November 2008.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.