New General Catalog
The New General Catalog was published in 1888, by the Danish astronomer JLE Dreyer. Extended by two Index Catalogs (IC), the catalog lists 13,000 objects in total.
Some of the more well-known are listed here
Only one of three globulars clearly visible with the naked eye.
(along with Omega Centauri and M13)
Magnitude 4.5
Found in the region between Perseus and Cassiopeia, separated by about 0.6 of a degree. They are actually close together in the Galaxy, in the Perseus arm, at a distance of 7000-8000 light years.
Surrounds the variable star T Tauri. It is one of three nebulae known to change shape on fairly short timescales, by virtue of the light from the relevant star varying. Has not been seen visually for over 70 years but can be recorded photographically or with CCDs.
In the Dorado constellation. It is actually in the Large Magellanic Cloud. It is the largest of the numerous pink nebulae in the LMC (of which there is an image below).
In Monoceros. Also contains an galactic cluster NGC 2244.
In Monoceros
In Gemini and discovered by William Herschel in 1787. Considered to be a challenge for amateurs.
In Crux. Small but has stars of several colors.
Visually, distinguished by a dark band that crosses its center, As a strong radio source, it is known as
Centaurus A, emiting more than 1000 times as much radio energy as the Milky Way.
It is of fourth magnitude, so bright it was given a stellar designation, ω-Centauri, by Johann Bayer. It is the brightest Globular Cluster in the sky.
Lies 3° away from Deneb. It is hard to find because of its size (1.5°) and its faintness per unit area. Its magnitude is four but this is obviously accrued from a large area -it can therefore be easier to see with the naked eye than thru a telescope. It gets its name from its shape in photographs, a shape which is not apparent when viewing with the eye.
The nearest and brightest Planetary Nebula is NGC 7293 in Aquarius, which was not included in Messier's list. In the South of the constellation of Aquarius.
Commonly seen in photographs but hard to see visually. Close to Orion's belt, just below the leftmost of the three stars in the belt.
NGC 104, 47 Tucanae
Globular Cluster
NGC 869/ NGC 884, Double Cluster in Perseus (h and chi Persei)
Galactic Clusters
NGC 1555, Hind's variable nebulae
Reflection nebula
NGC 2070, Tarantula Nebula, 30 Doradus Nebula
HII Nebula
NGC 2237, Rosette Nebula
NGC 2264, Christmas Tree Nebula
Galactic Cluster
NGC 2392, Clownface Nebula, Eskimo Nebula
Planetary Nebula
NGC 3372, η Carina Nebula
It surrounds the star η Carinae which was noticed to be a variable by Edmond Halley in 1677. In 1843, it was competing with Sirius to be the brightest star in the sky, but nowadays
has been below sixth magnitude. Another (dark) nebula, NGC 3324, the Keyhole Nebula, is superimposed on NGC 3372.
NGC 4755, The Jewel Box
Galactic Clusters
NGC 5128 (Centaurus A)
Elliptical Galaxy
NGC 5139, ω Centauri
Globular Cluster
NGC 6960, 6992, 6995. Vela Nebula
Supernova Remnant
Further details
here.
NGC 7000, North American Nebula
HII Nebula
NGC 7293, Helix Nebula
>
Planetary Nebula
IC 434, Horsehead Nebula
Dark Nebula