Several of the small bright "knots" along the Milky Way are bright nebulae
, large clouds of mainly hydrogen flooded with ultraviolet radiation from nearby hot stars, causing them to glow like neon signs.
Get familiar with compilations of nebulae, like the Sharpless (Sh) and van den Bergh (vdB) catalogs, as well as Lynd's Bright Nebulae
(LBN) and Lynd's Dark Nebulae (LDN).
Of course when looking at objects in the Milky Way, these are mostly fairly close, and there are a wide range of objects to be seen with a telescope--planetary nebulae, bright nebulae
, dark nebulae and supernova remnants, and here are just a few suggestions of objects to look at in these categories.
Lynds' Catalog of Bright Nebulae
) can be found within an area of 2 degrees east of NGC 2613.
Number 777 in Lynds' Catalogue of Bright Nebulae
is a dusty patch in Taurus known by some as the Vulture Head Nebula, located just 5[degrees] northeast of the Pleiades (M45).
Even if Herschel occasionally 'got it wrong' in, for instance, entering the remote globular NGC 6229 Herculis in his class IV 'planetary nebulae' ('[50.sup.4]' in old Norton's), his descriptive classes, from I= bright nebulae
to VIII = coarse star-clusters, remain a sound guide to what the visual observer can expect at the eyepiece ...
Narrowband filters are most effective when shooting emission nebulae, including most of the bright nebulae
on the Messier list, as well as planetary nebulae.
When William Herschel first observed this galaxy he recorded it as a double nebula and gave it two numbers--56 and 57 in his class I (bright nebulae
) category, possibly confused by brightness concentrations from HII regions in the central bar structure.