How many caldwell objects are there

The Caldwell Objects. Cambridge University Press. Renew your membership. Sign up for BAA Alerts. Website designed by Dominic Ford. Image gallery Forum Observing sections Shop online. Skip to main content. Sunday, , May 25 - Join the BAA today! Deep Sky. C49 Rosette Nebula A broad emission nebula in Monoceros , forming a swirling flower-like shape around a central cluster of stars. These two galaxies are interacting with one another, sending long thin tendrils of matter the 'antennae' of their name streaming out into space.

C80 Omega Centauri The brightest globular cluster in the sky, lying within the central regions of the constellation Centaurus. C92 Eta Carinae Nebula An immense and complex region of nebulosity surrounding the extraordinary hypergiant star system Eta Carinae. C99 The Coalsack A wide patch of dark material, mainly within the constellation Crux , that blocks out much of the light of the Milky Way behind it. Shining through this dark dust is another Caldwell object, number C98 , also known as the Coalsack Cluster C 47 Tucanae The second brightest globular cluster in the sky after Omega Centauri C80 above , 47 Tucanae lies in the constellation of Tucana , in the approximate direction the Small Magellanic Cloud.

Caldwell Catalogue A catalogue of one hundred and nine deep sky objects created by the astronomer and broadcaster Sir Patrick Moore.

Origins and Purpose Charles Messier first published his catalogue in , and it has since been expanded to include a total of objects, with Messier numbers still commonly used for some of the most important objects in the sky such as M1 for the Crab Nebula , or M31 for the Andromeda Galaxy. The Caldwell Objects The Caldwell Catalogue lists 45 star clusters , 35 galaxies and 29 nebulae of various kinds.

Some of the most important or familiar catalogue entries include: Number. Also called the Sword Handle , a bright pair of open star clusters in the northern parts of Perseus. An emission nebula in Cygnus , shaped by dark lanes of dust that trace a shape reminiscent of the eastern coast of the continent of North America. The remnant of a supernova explosion that forms a wide ring-shaped structure in Cygnus. An open cluster that forms the head of Taurus the Bull.

To locate the nebula, sweep 2. A 4-inch telescope will show the nebula as a hazy circular patch, but a inch or larger instrument with either a hydrogen-beta or ultra-high contrast filter will offer an improved view, cutting down the light from two bright embedded stars.

On a crisp, clear night, the nebula can just be seen with the naked eye as a rich area of nebulosity. For imagers this is an ideal object for hydrogen-alpha filtering, but for observing binoculars or a 4-inch telescope at very low magnification are the instruments of choice. If you have access to a larger scope however, it is well worth seeking out open clusters NGC and NGC , which are embedded within the nebulosity.

Find the nebula by imagining a line from mag. Time for another constellation and a very different object indeed. Planetary nebulae form when old stars are no longer able to s upport fusion at their cores and they start to collapse in on themselves. One such nebula is the beautiful Blue Snowball in which ultraviolet light from the hot core has excited the surrounding gas molecules and the strong emission from ionised oxygen produces a gorgeous bluish hue.

Through a small telescope, the nebula looks like a fuzzy star, but a larger scope will resolve the disc and the darker central region. The nebula lies 4. Our first object in the final stint is spiral galaxy NGC in Camelopardalis, also known as Caldwell 7. It has an appearance very similar to that of the Triangulam Galaxy, with numerous HII star-forming regions within its two layers of spiral arms. Shining at mag. NGC is somewhat isolated in sparsely populated Camelopardalis.

A quick hop southwards into Lynx will take us to a distant globular cluster known as the Intergalactic Wanderer one of our favourite globular clusters , as it was originally believed to be located outside the gravitational influence of the Milky Way something we now know to be untrue. All images are digitally watermarked. Caldwell Catalog The Messier Catalog is a list of of the brightest deep sky objects including star clusters, nebulae, and galaxies visible from the Northern Hemisphere.

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