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| Ophiuchus (constellation) | |
|---|---|
| Name | Ophiuchus |
| Genitive | Ophiuchi |
| Abbreviation | Oph |
| Symbolism | the Serpent Bearer |
| Right ascension | 17h 00m |
| Declination | −10° |
| Family | Hercules |
| Area rank | 11th |
| Brightest star name | Rasalhague (Alpha Ophiuchi) |
| Brightest star mag | 2.07 |
| Quadrants | SQ4 |
| Visible between | +80° and −70° |
Ophiuchus (constellation) is a large northern constellation traditionally depicted as a man grasping a serpent, situated near Scorpius, Sagittarius (constellation), and Hercules (constellation). Recognized since antiquity, Ophiuchus borders the Milky Way and contains bright stars and multiple deep-sky objects that have attracted interest from astronomers such as Ptolemy, Johannes Hevelius, and William Herschel. It occupies an important place in classical star catalogues and modern observational programs run by institutions like the Royal Astronomical Society and the International Astronomical Union.
Ophiuchus is associated with mythic healers and heroes, notably Asclepius from Greek mythology, whose staff entwined with a serpent became the symbol of medicine represented in later heraldry like the Rod of Asclepius. Ancient authors including Hesiod and Aratus linked the figure to chthonic and healing themes, while Classical astronomers such as Claudius Ptolemy catalogued its stars in the Almagest. During the Renaissance, astronomers like Nicolaus Copernicus and Tycho Brahe referenced Ophiuchus in celestial maps, and 17th-century cartographers including Johannes Hevelius refined its pictorial depiction. Modern nomenclature and constellation borders were standardized by the International Astronomical Union in the 20th century, influenced by work from observatories such as the Royal Greenwich Observatory.
Ophiuchus lies along the northern part of the Milky Way between the constellations Scorpius, Libra (constellation), and Sagitta, making it prominent in summer skies of the Northern Hemisphere and autumn skies of the Southern Hemisphere. Its right ascension centers near 17 hours and declination near −10 degrees, placing it within view from latitudes between +80° and −70°; observers using instruments at facilities like the Palomar Observatory and the Very Large Telescope often target its fields for surveys. The constellation spans a large area, ranking 11th in size, and includes portions of the ecliptic near Sagittarius (constellation), affecting its appearance in planetary conjunctions recorded by groups such as the American Astronomical Society.
Ophiuchus contains several notable stars catalogued by projects such as the Henry Draper Catalogue and observed by missions including Hipparcos and Gaia (spacecraft). Its brightest star, Rasalhague (Alpha Ophiuchi), is a rapid rotator studied by teams at institutions like Massachusetts Institute of Technology and the Max Planck Institute for Astronomy. Beta Ophiuchi (Cebalrai) and Gamma Ophiuchi are used as photometric and spectroscopic standards in surveys led by the European Southern Observatory. The constellation hosts variable and evolved stars such as Rho Ophiuchi, extensively observed in infrared by Spitzer Space Telescope and WISE (spacecraft), and the multiple-star systems that were targets for interferometry at CHARA Array and radio studies at the Jodrell Bank Observatory. Historically, novae and transient phenomena in Ophiuchus were recorded by observers including Tycho Brahe and later monitored by networks like the American Association of Variable Star Observers.
Embedded in the Milky Way near the Rho Ophiuchi cloud complex, Ophiuchus contains star-forming nebulae, dark molecular clouds, and young stellar objects studied by teams at Caltech and the Harvard–Smithsonian Center for Astrophysics. Prominent objects include the Rho Ophiuchi cloud, imaged by Hubble Space Telescope and Spitzer Space Telescope, and globular clusters such as Messier 10 and Messier 12, catalogued by Charles Messier and examined by observatories like Keck Observatory. The constellation also contains the emission nebula IC 4665 and X-ray sources identified by Chandra X-ray Observatory, with supernova remnant candidates surveyed by European Space Agency missions. Amateur astronomy organizations including the Royal Astronomical Society of Canada often highlight Ophiuchus for binocular and small-telescope observing due to its rich deep-sky content.
Although not traditionally one of the twelve classical Zodiac signs codified by Hellenistic astrologers, Ophiuchus intersects the ecliptic and the apparent path of the Sun (star) near the boundary with Scorpius, leading to occasional popular discussion about a "13th sign" in media outlets and public debates involving figures such as Carl Sagan and commentators in outlets like BBC News. The ecliptic passage through Ophiuchus has been used in modern scholarly examinations by historians of science at institutions including University of Cambridge and Princeton University to illustrate the differences between astronomical constellations and astrological signs codified in sources such as Ptolemy and later medieval manuscripts.
Ophiuchus has featured in medical iconography, Renaissance art commissioned by patrons like Lorenzo de' Medici, and maps by cartographers such as Urania (atlas) creators, reflecting links to Asclepius and healing traditions preserved in museums like the Louvre. In contemporary science, Ophiuchus fields are important for studies of star formation, stellar evolution, and exoplanet searches undertaken by collaborations including NASA, European Space Agency, and university consortia at University of California, Berkeley. Public outreach by planetariums such as the Griffith Observatory and societies like the Society for Popular Astronomy often use Ophiuchus to illustrate stellar life cycles and the historical layering of myth, catalogue, and modern astrophysics.
Category:Constellations