What are the astronomical catalogues | Earth, Solar System and Universe.

Astronomical catalogues are lists of deep space objects that are fixed in the sky. They are very useful for astronomy fans, since they collect the major galaxies, nebulae and star clusters that can be seen with a medium telescope.
The best-known are:
Messier catalog: is the most famous and the first published. Developed it the French astronomer Charles Messier in 1.769. It brings together 110 objects numbered M1 to the M110, in the order in which Messier discovered them while observing the sky in search of comets. Only collect objects visible from the northern hemisphere.
Caldwell catalogue: was developed to complement the Messier catalogue. Collect 109 numbered objects from the C1 to the C109, by order of latitude from North to South. It includes objects in the southern hemisphere and others important in the northern hemisphere who do not appear in the Messier, as the Hyades.
Herschel 400 catalogue: was created for use by astronomy fans. Collect 400 easy to see with a telescope half objects. It is a selection of objects of the General catalogue of nebulae and clusters of stars, made in 1864 by the English Astronomer William Herschel.
New General catalogue: is currently, along with the Messier catalog used to name objects in deep space. He was published in 1880 to update the catalogue for Herschel, and included all the objects known until then. Uses the acronym NGC then the object number. The current version of the NGC gathers more than 13,000 objects.

What is the Messier Marathon?

Each year, thousands of astronomy enthusiasts gather to celebrate the Messier Marathon. It is observed in a single night the 110 objects of the Messier catalogue.
The Messier marathon held at the end of March each year, coinciding with the new early spring moon. It is the ideal time for observation.
Although attended by fans from around the globe, Marathon only can hold in the northern hemisphere, as the catalogue only collects objects visible from there.
Published for educational purposes