By Warren H. Finlay
This booklet is for the beginner astronomer who desires to find out about the astrophysical nature of deep sky items. the knowledge is gifted in a concise structure and is both precious while used as historical past examining or, then again, on the telescope eyepiece.
The earlier a long time have noticeable an unheard of elevate in specialist astronomers realizing of astronomical gadgets. despite the fact that, typically this data is contained in magazine courses that almost all novice astronomers both wouldn't have entry to or may locate tricky to learn. during this booklet, uncomplicated information on each one item (e.g., value, position, distance, age if identified) is gifted in a fashion that enables the reader to fast entry the knowledge. this can be by means of a few comments that trap the main attention-grabbing astrophysical evidence.
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Extra info for Concise Catalog of Deep-Sky Objects: Astrophysical Information for 550 Galaxies, Clusters and Nebulae
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.
The star’s atmosphere outside the bright photosphere). In professional telescopes, approximately 60 % of the 700 or so stars with magnitudes of between 14 and 24 in this region are cluster stars (the rest are field stars). Fig. 34 Photo of M34; 2 × 10 min red, green, and blue exposures with SBIG ST-8XE camera, Takahashi FSQ 106 mm f/7 telescope. North is up and east is to the left. (Copyright John Mirtle) 50 2 The Messier Objects M35 (NGC 2168) Constellation Object type RA, Dec Approx. , directly outward from us in the opposite direction from the center of the galaxy), about 100 light years above the galactic central plane.
Copyright John Mirtle) M25 (IC 4725) Constellation Object type RA, Dec Approx. 6 This has a diameter of about 15 light years and has a mass of over 1,000 suns. It contains one Cepheid variable star (U Sgr, mag. 4 – see NGC 7790 for an explanation of Cepheid variables). It also contains six known Be stars (see M47 for explanation of Be stars). 38 2 The Messier Objects Fig. 25 Photo of M25 (IC 4725); 2 × 10 min luminance, red, green, blue exposures with QSI540wsg camera, Skywatcher 80 mm telescope.