By W. H. Finlay
Here is a different and engaging reference publication for each critical deep-sky observer! Entries for every of greater than 500 deep-sky gadgets supply excess of the standard astronomical information – additionally they element, in each case, the main attention-grabbing proof. actual elements, astrophysical info, evolution, strange good points, the checklist is unending. The items are all indexed in NGC order. Astronomers can now get an perception into precisely what they're , so as to add a brand new point of perception and delight to deep-sky observing.
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Additional resources for Concise Catalog of Deep-sky Objects: Astrophysical Information for 500 Galaxies, Clusters and Nebulae
M 43 (NGC 1982) Constellation Orion Age Object type RA, Dec Approx. 0 11 C53/D24 Distance This is part of the same gas and dust cloud as M 42 (the Orion A complex), lying just NE of M 42, separated from M 42 by a dust lane between the two. e. HII, region). e. HD 37061, mag. 7) in its center. Professional telescopic studies ﬁnd planet-forming disks (“proplyds”) are present around several stars in M 43 (as well as in M 42). M 44 (NGC 2632) Constellation Object type RA, Dec Approx. 1 6 C32 Distance Nicknamed the “Beehive Cluster” or “Praesepe” (which means manger in Latin, its common-use anglicized pronunciation being pree-SEE-pee).
The nebula is expanding at a few tens of km/s and has a mass about 13% that of our Sun (not including the central star, whose mass is about 60% that of the Sun and is a challenging object in amateur telescopes). The three-dimensional structure of this nebula is complex in professional telescopic studies, although the “owl’s eyes” are thought to be part of a bipolar (“hourglass”) barrel-shaped structure (inclined from our line-of-sight by about 45°) that is inside three separate elliptical shells.
5 19 C70/D22 Distance It has a diameter of about 20 light years. A large percentage (perhaps as high as 80%) of its stars are binary stars. Open clusters are beasts of the Galactic disk, and are stripped of their stars over time by gravitational interaction with material in the disk as they jostle about the disk while rotating with it. For an open cluster in our vicinity of the Galaxy, like this one, typical lifetimes are thought to be a little over 1/2 billion years, so that this cluster is approaching middle age.
Concise Catalog of Deep-sky Objects: Astrophysical Information for 500 Galaxies, Clusters and Nebulae by W. H. Finlay