By Warren H. Finlay
This e-book 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 beneficial while used as heritage analyzing or, however, on the telescope eyepiece.
The prior a long time have visible an remarkable bring up in expert astronomers knowing of astronomical gadgets. even though, in most cases this data is contained in magazine courses that the majority beginner astronomers both wouldn't have entry to or might locate tricky to learn. during this e-book, easy facts on each one item (e.g., importance, situation, distance, age if recognized) is gifted in a fashion that permits the reader to quick entry the data. this can be through a few comments that trap the main attention-grabbing astrophysical evidence.
Read or Download Concise Catalog of Deep-Sky Objects: Astrophysical Information for 550 Galaxies, Clusters and Nebulae PDF
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Additional info for Concise Catalog of Deep-Sky Objects: Astrophysical Information for 550 Galaxies, Clusters and Nebulae
The central star (mag. 8) lies at the narrowest part of the “bowtie” shape and has a temperature of about 110,000 K. The nebula is several thousand years old and still expanding (at several tens of km/s). In professional telescopes M27 is found to have an elliptical halo surrounding the main nebula, which itself is elliptical, and also contains an internal elliptical shell, so that the structure of this nebula consists of nested shells. 2 The Messier Objects 40 Fig. 5″ f/8 telescope on Paramount ME mount.
Interactions with the Milky Way’s gravitational pull have resulted in mass loss and perhaps two tidal tails, one of which may be due to its last passage about 4 million years ago through the galactic central plane. 41 The Messier Objects Fig. 28 Photo of M28; 8 × 4 min exposures with Canon 40D camera, ISO 800, Celestron 14″ telescope with Hyperstar lens corrector. North is up and east is to the left. (Copyright Dalton Wilson) M29 (NGC 6913) Constellation Object type Cygnus Open cluster Distance Age 3,000 light years A few million years RA, Dec Approx.
Fig. 33 Photo of M33; 9 × 5 min exposure ISO 1600, Canon 60Da camera, 200 mm Skywatcher f/5 Newtonian reflector with a Paracorr coma corrector. 1 m, +42° 46′ Apparent size 25′ Approx. 2 This has a diameter of about 10 light years and was discovered in the middle of the seventeenth century by Giovanni Batista Hodierna. Its stars rotate at rates that are midway between those in the younger Pleiades cluster (100 million years old – see M45) and the older Hyades cluster (600 million years old). This is thought to be the result of rotational braking, whose effect on rotation rates becomes more pronounced with age.