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2013-09-11T16:50:02Z

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{{Infobox planet
| minorplanet = yes
| width = 25em
| bgcolour = #FFFFC0
| name = 3671 Dionysus
| image = [[File:Orbit of 3671 Dionysus.gif|thumb|300 px|Orbit of 3671 Dionysus]]
| caption =
| discovery = yes
| discovery_ref =
| discoverer = [[Carolyn Shoemaker|Carolyn]] and [[Gene Shoemaker]]
| discovery_site = [[Palomar Observatory]]
| discovered = May 27, 1984
| designations = yes
| mp_name = 3671
| alt_names = {{mp|1984 KD|}}<ref name=jpldata/>
| named_after = [[Dionysus]]
| mp_category =
| orbit_ref = <ref name=jpldata>[http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3671 JPL Small-Body Database Browser on 3671 Dionysus] Retrieved 2011-09-22</ref>
| epoch = August 27, 2011 ([[Julian day|JD]] 2455800.5
| aphelion = 3.389130075 AU
| perihelion = 1.00645923 AU
| semimajor = 2.197794652 AU
| eccentricity = 0.54205947
| period = 3.258283510 yr (1190.088052 d)
| avg_speed =
| inclination = 13.547627°
| asc_node = 82.15874°
| mean_anomaly = 120.239711°
| arg_peri = 204.23906°
| satellites = 1
| physical_characteristics = yes
| dimensions = 1.5 km<ref name=jpldata/>
| mass =
| density = 1.6 g/cm<sup>3</sup><ref name="Survey">{{cite journal | url=http://adsabs.harvard.edu//abs/2006Icar..181...63P | title=Photometric survey of binary near-Earth asteroids | journal=[[Icarus Journal]] |date=March 2006 | doi=10.1016/j.icarus.2005.10.014}}</ref>
| sidereal_day = 2.7053 h<ref name=jpldata/>
| axial_tilt =
| pole_ecliptic_lat =
| pole_ecliptic_lon =
| albedo = 0.16<ref name=jpldata/>
| temperatures=
| spectral_type = [[B-type asteroid|B]]<ref name=jpldata/>
| abs_magnitude = 16.3<ref name=jpldata/>
}}
'''3671 Dionysus''' is a small binary [[Amor asteroid]], orbiting between the [[Earth]] and the [[asteroid belt]]. It was discovered by [[Carolyn Shoemaker|Carolyn]] and [[Gene Shoemaker]] at [[Palomar Observatory]] on 27 May 1984. It is named after [[Dionysus]], the [[Greek god]] of wine. Its [[provisional designation]] was '''1984 KD'''. It is an [[List of Earth-crossing minor planets|outer Earth grazer]] because its perihelion is just within Earth's orbit.

== Near-Earth object ==
Dionysus makes many close approaches to Earth. Its closest approach so far occurred in 1984, when Dionysus passed just {{convert|0.03047|AU|km}} from Earth.<ref name=jpldata/> Dionysus is expected to continue to make close approaches.

== Moon ==
In 1997, a team of astronomers at the [[European Southern Observatory]] announced that [[lightcurve]] observations indicate the presence of a small moon orbiting Dionysus. Its provisional designation is S/1997 (3671) 1. This moon measures 300 meters in diameter, and orbits 3.6km from Dionysus with an [[Orbital eccentricity|eccentricity]] of 0.07 and an [[orbital period]] of 27.72 hours.<ref name=johnston>[http://www.johnstonsarchive.net/astro/astmoons/am-03671.html Johnston's Archive: (3671) Dionysus and S/1997 (3671) 1]</ref> From the surface of Dionysus, S/1997 (3671) 1 would have an apparent diameter of roughly 3.02 degrees.<ref group="lower-alpha">Calculated by solving the equation <math> \scriptstyle{\mathrm{tan}\left(\frac{\theta}{2}\right) = \frac{\mathrm{radius~of~moon}}{\mathrm{distance~from~surface~of~asteroid~to~center~of~moon}}}</math>.</ref> For comparison, the [[Sun]] appears to be 0.5° from Earth.

== Notes ==
{{notelist}}

==References==
{{reflist}}

{{DEFAULTSORT:Dionysus}}

[[Category:Amor asteroids|Dionysus]]
[[Category:B-type asteroids|Dionysus]]
[[Category:Binary asteroids|Dionysus]]
[[Category:Asteroids named from Greek mythology]]
[[Category:Discoveries by Eugene Merle Shoemaker]]
[[Category:Discoveries by Carolyn S. Shoemaker]]
[[Category:Astronomical objects discovered in 1984]]

{{Minor planets navigator|3670 Northcott|3672 Stevedberg}}
{{Small Solar System bodies}}

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