Tag Archives: Teapot

Corona Australis (The southern crown)

Constellation Corona AustralisCorona Australis is a southern constellation that was cataloged by 2nd century astronomer Ptolemy, and remains among the 88 modern constellations. This horseshoe-shaped constellation lies about as far south as, and adjacent to the crook of Scorpius’ tail, and just beneath the teapot asterism of Sagittarius. Because of its far southern location in the celestial sphere, it barely rises above the southern horizon before setting again. Corona Australis reaches its highest nightfall ascension in September.

This constellation provides the foreground stars for a portion of the Milky Way pointing in a direction near the center of our galaxy. The most notable object in this region is the Corona Australis Molecular Cloud, a large and dark molecular cloud with many embedded reflection nebulae. There are many other telescopically interesting objects in this constellation to include star-forming regions with proto-stars, galaxies, and variable stars.
http://en.wikipedia.org/wiki/Corona_Australis

IAU Corona Australis chart, IAU and Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 5, 2011.
IAU Corona Australis chart, IAU and Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 5, 2011.

© James R. Johnson, 2014.
jim@jrjohnson.net

Sagittarius (The archer)

Constellation SagittariusSagittarius, the archer, is a zodiacal constellation that is rather easily found because of its distinctive teapot asterism. It is one of the 48 constellations cataloged by the 2nd century astronomer Ptolemy. It is located on the ecliptic between Scorpius and Capricornus. It can also be found by starting at Altair (a Summer Triangle star) and tracing southward along Aquila’s long axis. As is situated on southern most point of the ecliptic, this constellation hangs low in the southern sky, reaching its highest nightfall ascension in August. The Sun’s arrival at the southernmost point of the ecliptic around December 21st marks Winter Solstice and the first day of Winter.

This constellation has the distinction of presenting the foreground stars in the direction of the dense center of the Milky Way galaxy, which is rich in Messier objects. As such, it is worth taking the time to scan this constellation with binoculars or a small telescope. Several well-known nebula can be found in Sagittarius to include the Lagoon Nebula (M8), the Horseshoe Nebula, the Omega Nebula (M17), the Trifid Nebula (M20), and the Small Sagittarius Star Cloud (M24). Other Messier objects include M18, M22, M23, M25, M28, M54, M55, M69, M70 and M75.
http://en.wikipedia.org/wiki/Sagittarius_(constellation)

IAU Sagittarius chart, Sky & Telescope magazine, June 5, 2011.
IAU Sagittarius chart, Sky & Telescope magazine (Roger Sinnott and Rick Fienberg), June 5, 2011.

© James R. Johnson, 2014.
jim@jrjohnson.net