M. Usatov

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  • Notes & EssaysMy essays on various astronomy topics.
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Notes & Essays

Stellar-Mass Black Holes

October 21, 2014October 21, 2016

Stellar-mass black holes are the result of a gravitational collapse of a massive star at the end of its life. […]

Notes & Essays

150 Years Ago Today… Note on the Variable Nebula in Taurus

October 21, 2014October 21, 2016

Tracing the origins of the discovery and the development of observations of NGC 1555, also referred to as the Hind’s […]

Notes & Essays

NGC 4755: Color-Magnitude Diagrams (CMDs) and Zero-Age Main Sequence Luminosities

October 21, 2014October 21, 2016

The CMD submitted in the previous fortnight shows members of NGC 4755 – an open cluster in Crux. The stars […]

Notes & Essays

The Importance of Astrology for the Development and Survival of Astronomy During Medieval Times

October 21, 2014October 21, 2016

As an amateur astronomer, I was to an unnecessary degree opposed to the concept of astrology, especially if questioned about […]

Solar System

Jupiter and Io

October 9, 2014October 9, 2016

Jupiter and its satellite, Io, with WinJUPOS stereographic projections of North and South poles.

Solar System

Sunspot Group AR 1236 in CaK

October 12, 2011October 12, 2016

Sunspot Group AR 1236 in Calcium K Line

Planetary Nebulae

M 57

October 9, 2011October 9, 2016

M57—The Ring Nebula (NGC 6720)

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).

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