3671 Dionysus

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3671 Dionysus
Orbit of 3671 Dionysus.gif
Orbit of 3671 Dionysus
Discovery
Discovered by C. S. Shoemaker
E. M. Shoemaker
Discovery site Palomar Observatory
Discovery date27 May 1984
Designations
(3671) Dionysus
Pronunciation /daɪəˈnaɪsəs/ [1]
Named after
 Διόνυσος Dionȳsos
1984 KD [2]
PHA [2]
Adjectives Dionysian /daɪəˈnɪsiən/ [3]
Orbital characteristics [2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 11629 days (31.84 yr)
Aphelion 3.389527126  AU (507.0660407  Gm)
Perihelion 1.00825538 AU (150.832858 Gm)
2.198891253 AU (328.9494493 Gm)
Eccentricity 0.54147101
3.26 yr (1191.0 d)
244.408078°
0° 18m 8.181s / day
Inclination 13.5346771°
82.1319934°
204.217348°
Known satellites 1
Earth  MOID 0.0199599 AU (2.98596 Gm)
Physical characteristics
Dimensions1.5 km [2]
Mean density
1.6 g/cm3 [4]
2.7053  h (0.11272  d) [2]
0.16 [2]
B [2]
16.5 [2]

    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.

    Contents

    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 (2,976,000  km ; 1,849,000  mi ). [2] 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 (4,560,000 km; 2,840,000 mi) from Earth. [2] On 18 June 2085 it will pass 0.028 AU (4,200,000 km; 2,600,000 mi) from Earth. [2]

    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. [5] From the surface of Dionysus, S/1997 (3671) 1 would have an apparent diameter of roughly 3.02 degrees. [lower-alpha 1] For comparison, the Sun appears to be 0.5° from Earth.

    Notes

    1. ↑ Calculated by solving the equation .

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    References

    1. ↑ Webster (1884) A Practical Dictionary
    2. 1 2 3 4 5 6 7 8 9 10 11 "3671 Dionysus (1984 KD)". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 14 April 2016.
    3. ↑ "Dionysian" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    4. ↑ Pravec, P.; Scheirich, P.; Kusnirak, P.; Sarounova, L.; Mottola, S.; Hahn, G.; Brown, P.; Esquerdo, G.; Kaiser, N.; Krzeminski, Z.; Pray, D. P.; Warner, B. D.; Harris, A. W.; Nolan, M. C.; Howell, E. S.; Benner, L. A. M.; Margot, J. -L.; Galád, A.; Holliday, W.; Hicks, M. D.; Krugly, Yu. N.; Tholen, D.; Whiteley, R.; Marchis, F.; Degraff, D. R.; Grauer, A.; Larson, S.; Velichko, F. P.; Cooney, W. R.; et al. (March 2006). "Photometric survey of binary near-Earth asteroids". Icarus . 181 (1): 63–93. Bibcode:2006Icar..181...63P. doi:10.1016/j.icarus.2005.10.014.
    5. ↑ Johnston's Archive: (3671) Dionysus and S/1997 (3671) 1
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