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3671 Dionysus

Binary Amor asteroid orbiting between Earth and the asteroid belt

Field	Value
minorplanet	yes
background	#FFC2E0
name	3671 Dionysus
image	Orbit of 3671 Dionysus.gif
caption	Orbit of 3671 Dionysus
discoverer	C. S. Shoemaker
E. M. Shoemaker
discovery_site	Palomar Observatory
discovered	27 May 1984
mpc_name	(3671) Dionysus
alt_names
pronounced
adjective	Dionysian
named_after	Διόνυσος Dionȳsos
mp_category	PHA
orbit_ref
epoch	13 January 2016 (JD 2457400.5)
aphelion	3.389527126 AU
perihelion	1.00825538 AU
semimajor	2.198891253 AU
eccentricity	0.54147101
period	3.26 yr (1191.0 d)
inclination	13.5346771°
asc_node	82.1319934°
mean_anomaly	244.408078°
arg_peri	204.217348°
satellites	1
dimensions	1.5 km
density	1.6 g/cm3
albedo	0.16
spectral_type	B
abs_magnitude	16.5
mean_motion	/ day
rotation	2.7053 h
observation_arc	11629 days (31.84 yr)
uncertainty	0
moid	0.0199599 AU

E. M. Shoemaker

3671 Dionysus is a small binary Amor asteroid, orbiting between Earth and the asteroid belt. It was discovered by 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 outer Earth grazer because its perihelion is just within Earth's orbit.

Potentially hazardous object

3671 Dionysus is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 150 meters. The Earth-MOID is 0.01989 AU. Its orbit is well-determined for the next several hundred years.

Dionysus makes modestly close approaches to Earth. On 19 June 1984 Dionysus passed 0.0305 AU from Earth. On 18 June 2085 it will pass 0.028 AU from Earth.

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 3.6 km from Dionysus with an eccentricity of 0.07 and an orbital period of 27.72 hours. From the surface of Dionysus, S/1997 (3671) 1 would have an apparent diameter of roughly 3.02 degrees.Calculated by solving the equation \scriptstyle{\mathrm{tan}\left(\frac{\theta}{2}\right) = \frac{\mathrm{radius~of~moon}}{\mathrm{distance~from~surface~of~asteroid~to~center~of~moon}}}. For comparison, the Sun appears to be 0.5° from Earth.

Notes

References

Webster (1884) ''A Practical Dictionary''
{{OED. Dionysian
"3671 Dionysus (1984 KD)". [[NASA]]/[[Jet Propulsion Laboratory]].
(March 2006). "Photometric survey of binary near-Earth asteroids". [[Icarus (journal).
[http://www.johnstonsarchive.net/astro/astmoons/am-03671.html Johnston's Archive: (3671) Dionysus and S/1997 (3671) 1]

Info: Wikipedia Source

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