Infobox Constellation name Aries abbreviation Ari genitive Arietis pronounce IPAc en icon r i z , or formally IPAc en r . i z genitive IPAc en r a . t s symbolism the Domestic sheep Ram RA 3 dec 20 family Zodiac quadrant NQ1 areatotal 441 arearank 39th numbermainstars 3, 10 numberbfstars 67 numberstarsplanets 6 numberbrightstars 2 numbernearbystars 4 brighteststarname Alpha Arietis Ari Hamal starmagnitude 2.01 neareststarname Teegarden s Star stardistancely 12.58 stardistancepc 3.86 numbermessierobjects 0 meteorshowers May Arietids br Autumn Arietids br Delta Arietids br Epsilon Arietids br Daytime Arietids br Aries Triangulids bordering Perseus constellation Perseus br Triangulum br Pisces constellation Pisces br Cetus br Taurus constellation Taurus latmax North Pole 90 latmin 60th parallel south 60 month December notes Aries is one of the constellation s of the zodiac , located between Pisces constellation Pisces to the west and Taurus constellation Taurus to the east. Its name is Latin for sheep ram , and its symbol is File Aries.svg 20px Unicode Unicode , representing a ram s horns. Aries was one of the 48 constellations described by the 2nd century astronomer Ptolemy , and remains one of the 88 modern constellations today. Notable features File AriesCC.jpg thumb left 256px The constellation Aries as it can be seen with the naked eye Stars See also List of stars in Aries Deep sky objects The few deep sky object s in Aries are very dim. They include the galaxy galaxies NGC 697 northwest of Ari , NGC 772 southeast of Ari , NGC 972 in the constellation s northern corner , and NGC 1156 northwest of Ari . Visualizations Expand section date February 2009 File Ariesurania.jpg thumb left 300px Aries as depicted in Urania s Mirror, a set of constellation cards published in London c.1825 Ancient Greek astronomers visualized Aries as a ram lying down with its head turned to the right. The stars Alpha Arietis , Beta Arietis and Gamma Arietis ... more details
Arietids , the delta Aquariids , and the Quadrantids . Linked comet orbits suggest that both ..., Arietids, the Marsden Comet Group, and the Kracht Comet Group , Publications of the Astronomical ... more details
extrasolar origin. ref name S&T 2008 12 05 Orbit The orbit of Machholz 1 corresponds to the Arietids ... 200310 000020031003A0165629.php title On the Association among Periodic Comet 96P Machholz, Arietids ... more details
About the astronomical object File Comet Hale Bopp 29 03 1997 hires adj.jpg thumb Comet Hale Bopp , as seen on 29 March 1997 in Pazin , Croatia File 103P Hartley 2 comet HST.jpg thumb right Comet 103P Hartley by Hubble space telescope Image 495296main epoxi 1 full full.jpg thumb right Nucleus of 103P Hartley with jets streaming out by a visiting space probe. It is about 2 km in length and 400 meters wide at its narrowest point. A comet is an icy small Solar System body SSSB that, when close enough to the Sun , displays a visible coma cometary coma a thin, fuzzy, temporary atmosphere and sometimes also a comet tail tail . These phenomena are both due to the effects of solar radiation and the solar wind upon the comet nucleus nucleus of the comet . Comet nuclei range from a P 2007 R5 few hundred meters to tens of kilometer s across and are composed of loose collections of ice, dust, and small rocky particles. Comets have been observed since ancient times and have traditionally been considered bad omen s. Comets have a wide range of orbital period s, ranging from a few years to hundreds of thousands of years. Short period comets originate in the Kuiper belt , or its associated scattered disc , ref name Davidsson cite web last Davidsson first B. title Comets Relics from the birth of the Solar System url http www.astro.uu.se bjorn eng comet.html publisher Uppsala University year 2008 accessdate 2009 04 25 ref which lie beyond the orbit of Neptune . Longer period comets are thought to originate in the Oort cloud , a hypothesized spherical cloud of icy bodies in the outer Solar System. Long period comets plunge towards the Sun from the Oort cloud because of gravitational perturbation s caused by either the massive outer planets of the Solar System Jupiter , Saturn , Uranus , and Neptune , or List of nearest stars passing stars . Rare Hyperbola hyperbolic comets pass once through the inner Solar System before being thrown out into interstellar space along Hyperbolic tr ... more details
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