What is IAAC?
What is "Deep-Sky"? (+ links)
Email Access to IAAC
History of IAAC
Find a Deep-Sky Object...
The Observation Archive...
The DISCUSSION Archive...
Enter Your Own Observation!
Frequently Asked Questions
Subscribing to the List!
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NetAstroCatalog - a mailing list for "deep sky" observers of all levels
What are "Deep-Sky Objects" anyway?
For those interested in learning more quickly, here are some
sites with excellent explanations of the soul and the substance of
amateur deep-sky observing:
Every passion has its object, and the object of amateur astronomy is
the visible Universe! But the Universe is a vast and complex place, so
that even amateur astronomers have to classify the various
things they see "Out There" based on observable characteristics: After
all, there are MANY different types of objects visible in our night
(and daytime) skies. And each type of object may require its own
distinct tools and skills to be well observed by us lucky amateurs.
Perhaps the most natural dividing line in all of astronomy is that
between objects which are gravitationally bound to Earth's Sun on the
one hand (the so-called "Solar System objects"), and everything which
isn't on the other. We know many objects to be our
fellow-travellers in orbit around the Sun: these include eight known
planets (excluding Earth), all of their moons (including our own
Luna), dizzying numbers and types of asteroids, long- and short-period
comets, "meteoroids" (the specks of dust that cause shooting stars),
"zodiacal dust" - and of course the Sun and Earth themselves!
Beyond the gravitational grasp of Sol however, lies a vast well of
emptiness, reaching all the way to the nearest stars, and then far,
far beyond. Inhabiting this daunting vastness are a whole unearthly
menagerie of different objects - essentially all of which can be seen
with your own eyes, if you have a little knowledge and skill!
This menagerie of visible objects in the depths of space are what
amateur astronomers call "the Deep Sky". Of course, Deep Sky
objects fall into categories as well! For amateurs, these categories
tend to tell us something about how to observe individual
objects, and (perhaps more importantly for our passion) what the real
NATURE of these tiny, faint objects is...
Here are some of the basic types of objects which we amateurs love to
observe in the Deep Sky, along with links to more info about each!
To find out more about the Deep-Sky take advantage of
some of the wonderful resources available on the Web, including:
AND REMEMBER: If you have further questions or comments about
deep-sky objects or deep-sky astronomical observing, don't
hesitate to share them with the subscribers of IAAC! Separate from the
main IAAC OBSERVING LIST, there is also a special mailing list for
DISCUSSIONS and ANNOUNCEMENTS relating to IAAC and to deep-sky,
called
netastrocatalog-announce. You may subscribe to this '-announce' list to read
others' comments, or submit your OWN comments to the list by sending
email to the address:
netastrocatalog-announce@visualdeepsky.org
Clear skies!
Lew Gramer
<dedalus@alum.mit.edu>
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