By Warren H. Finlay
This ebook is for the beginner astronomer who desires to find out about the astrophysical nature of deep sky gadgets. the data is gifted in a concise structure and is both priceless whilst used as historical past examining or, however, on the telescope eyepiece.
The previous many years have visible an extraordinary elevate in specialist astronomers realizing of astronomical gadgets. even if, in general this knowledge is contained in magazine courses that the majority beginner astronomers both would not have entry to or may locate tough to learn. during this ebook, simple facts on every one item (e.g., importance, position, distance, age if recognized) is gifted in a manner that permits the reader to speedy entry the knowledge. this is often through a few feedback that catch the main attention-grabbing astrophysical evidence.
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Additional resources for Concise Catalog of Deep-Sky Objects: Astrophysical Information for 550 Galaxies, Clusters and Nebulae
It has a mass of nearly 600 suns. 36 2 The Messier Objects Fig. 5 Schmidt camera. North is up and east is to the left. (Copyright John Mirtle) M24 (IC 4715) Constellation Object type RA, Dec Approx. 6 9,000–12,000 light years This is a patch of the Milky Way seen through a hole in the foreground interstellar dust that obscures the surrounding sky, making the patch appear as a cluster to Messier even though it is not a true cluster. Nicknamed the “Small Sagittarius Star Cloud,” the open cluster NGC 6603 (mag.
Fig. 15 Photo of M15; 10 × 3 min exposures with Canon 40D camera, ISO 800, Astro-Tech 8″ f/4 telescope. North is up and east is to the left. (Copyright Dalton Wilson) 26 2 The Messier Objects M16 (NGC 6611) Constellation Serpens Cauda Distance 6,000 light years Approx. 0 July 20 The stellar mass of this open cluster is thought to be about 20,000 suns. The cluster’s size of 8′ corresponds to a diameter of about 14 light years. It is embedded in a gas cloud from which the cluster formed and in which star formation is still going on.
A person in the middle would see a night sky with several hundred first mag. stars, each separated by <1 light year. This is nearly as dense as some globular clusters. A significant number of field stars are present as foreground/background stars. ) Fig. 11 Photo of M11; 20 min exposure on chilled Kodak Ektachrome 400 with 8″ f/6 Newtonian telescope. North is up and east is to the left. (Copyright John Mirtle) 2 The Messier Objects 22 M12 (NGC 6218) Constellation Object type Ophiuchus Globular cluster Distance Age 15,000 light years 10–14 billion years RA, Dec Approx.