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What does Messier 43 stand for?

Messier 43 or M43, also known as De Mairan's Nebula and NGC 1982, is a star-forming nebula with a prominent H II region in the equatorial constellation of Orion. It was discovered by the French scientist Jean-Jacques Dortous de Mairan some time before 1731, then catalogued by Charles Messier in 1769.

What is the Messier object M42?

There is a good full description at messier-objects.com. This image depicts M42 as well as M43, also known as the De Mairan Nebula, the “warped tear”-shaped nebula on top of the large M42. This time, the image and its story is in the center of attention.

What does M43 stand for?

Messier 43 or M43, also known as De Mairan's Nebula and NGC 1982, is a star-forming nebula with a prominent H II region in the equatorial constellation of Orion. It was discovered by the French scientist Jean-Jacques Dortous de Mairan some time before 1731, then catalogued by French astronomer Charles Messier on March 4, 1769.

How big is the Messier 43 nebula?

The nebula occupies an area of 20 x 15 arc minutes, corresponding to a true diameter of 9 light years. Messier 43 surrounds the star NU Orionis (HD 37061), an irregular variable with the stellar classification B0.5 V. The star is a blue main sequence dwarf whose brightness varies from magnitude 6.5 to 7.6.


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