M. Usatov

Astronomy Home Page

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  • Research
  • Notes & EssaysMy essays on various astronomy topics.
  • PostersMy posters and collages designed to concentrate overview information about a particular topic and serve as quick go-to knowledgebases.
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  • Diffuse Nebulae
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Planetary Nebulae

M 97

October 9, 2011October 9, 2016

M 97—The Owl Nebula (NGC 3587)

Planetary Nebulae

Abell 81

October 9, 2011October 9, 2016

Abell 81—Planetary Nebula in Cepheus (IC 1454, PK 117+18 1, ARO 376)

Planetary Nebulae

Abell 50

October 9, 2011October 9, 2016

Abell 50—Planetary Nebula in Draco (NGC 6742, PK 78+18.1).

Planetary Nebulae

Abell 61

October 9, 2011October 9, 2016

Abell 61 is an old, evolved planetary nebula, about the size of the M97 – The Owl, although much fainter. […]

Other

Observing the Sun in H-alpha

October 8, 2007October 8, 2016

An online article by D. Knisely translated to Russian.

Other

Spectroscopy with Star Analyzer 100

October 8, 2006October 8, 2016
Other

M 42 Nomenclature

October 8, 2006October 8, 2016

M42, the Great Orion Nebula, is probably one of the most interesting objects in the sky. The amount of details […]

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