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Spiral galaxy M83

Spiral galaxy M83 or Southern Pinwheel is in the constellation Hydra (Hya).


Equatorial coordinates (epoch J2000):
Ra (α):13h37.0m, Dec (δ):-29° 52'

Visual magnitude: 7,5m
Distance from the galaxy M83 to the Sun is 14,7*106 light years
Angular size: 13'×12'
Class: SABc (SBc)
External dimensions the galaxy M83 are about 55000 light years.

Discoverer: Nicolas-Louis De la Caille, 1752 year.

The designation M83 in other catalogs: NGC 5236

M83 is located too far in the southern hemisphere of the sky and is not visible in the north and in the middle latitudes.
In southern latitudes it is located low above the horizon - observation is hampered by atmospheric distortions. Optimum magnification for a telescope with observations of M83, depending on the aperture of the telescope (D), is about D/6-D/3. Higher magnifications of course add details, but lead to a strong drop in the brightness of the image, making it difficult to observe.

The best month for observing M83 is May. At this time, the object is at midnight near its highest point in the sky, that is, it is less affected by light from the lanterns and atmospheric distortions.

For observers in the northern latitudes:the night sky in May is no longer very dark, so try also to observe M83 in April.
Of course, in April the object is at midnight not at its highest point, whichprovides the least exposure and atmospheric distortion. But, the darkness of the April sky greatly increases the contrast.The farther south the location of your observation is located, the darker the summer sky will be.

Мessier 82
Мessier 84

Nikolay Kurdyapin, astro-map.com  

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