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Cristian Monea

22 Apr 2009 20:10


Catalog de obiecte ceresti

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Un catalog structurat de obiecte cere&#537;ti. Este u&#537;or de citit &#537;i bine structurat:

"BY RA - All objects, sorted by increasing right ascension, to assist the user in indentifying those objects that are "up" and available for observation on any given night.

BY TYPE - A cross-reference of the same set of objects, but grouped by object type:
Ephemeris Stars - moderately bright stars near +40° declination, useful for stellar
initialization.
Bright Stars - Alternate stellar initialization objects in the event that an appropriate Ephemeris Star cannot be found. Also useful to demonstrate how a bright star appears telescopically.
Red and Double Stars - Interesting, and sometimes challenging, examples of single, binary, and multiple star systems, sometimes with striking color combinations.
Open Clusters - Also known as "galactic clusters", the product of relatively recent starbirth regions. Tend to be loosely organized and dominated by blue stars.
Globular Clusters - Ancient, tightly-bound star systems which tend to group around the nucleus of the Milky Way. Contain thousands of component stars.
Planetary Nebulae - The "puffed-off" outer shells of a dying, Sun-like star. Named by Hershel, for their (sometimes) telescopic resemblance to Uranus, which he discovered.
Diffuse Nebula - Glowing gas clouds, primarily due to hydrogen-alpha emission. Starbirth occurs in these regions, ultimately resulting in a new open cluster.
Cataclysmic - Exotic, explosive, highly-energetic sources.
Galaxies - "Island universes" of stars lying outside our own Milky Way Galaxy.
MESSIER - A separate listing of this venerable and historical catalog.
M&M - A separate listing of Mullaney and McCall's catalog of celestial showpieces."

&#536;i īn plus, catalogul Herschel &#537;i Messier (īn format Excel).

