Articles

BASIC EXTRAGALACTIC ASTRONOMY Part 9: Supermassive Black Hole and Host Galaxy Coevolution

The only primary evidence available to an astronomer about a very remote object consists of photometric measurements, a spectrogram, and an image which is in many cases no more than a pinpoint of light. In this article we present basic cosmological concepts and simplified mathematical methods which allow an amateur to derive from this meager data a surprising number of physical properties of distant extragalactic objects with a precision of several percent within professional results.

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Restoring an Old Star-Liner Equatorial Mount

I have owned a large Star-Liner Equatorial Mount with 2 inch axes for over 50 years and in that time it has held a homemade 8 inch f/7 Newtonian, a homemade12.5 inch f/8 Newtonian, a 14 inch SC, a 6 inch refractor, an ATM 10 inch true Cassegrain.

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Understanding the ZWO ASI 294MM Pro Camera

Like other new CMOS cameras being introduced into the astrophotography market, the ZWO ASI 294MM Pro seems to be a strange beast (but not in a bad way). The first thing to notice is that it has a “jump” in performance at Gain 120.

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First Steps Into Variable Star Photometry

This short white paper aims to demonstrate that it is possible for the average amateur astronomer who is engaging in digital astronomy to step into the world of photometry. Why might you consider this? Well, it opens up opportunities for advancing one’s knowledge in the hobby, as well as the potential to participate in valuable citizen science projects, such as the upcoming Exoplanet Watch program. Participating in a course on exoplanet transit measurements hosted by the Boyce-Astro Foundation started my interest in photometric analysis. I wondered if my modest telescope setup could carry out such measurements.

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The Discoveries of Galileo – Part 5: The Milky Way, Orion, and Asterisms

This is the final article on the Discoveries of Galileo from 1609 to 1612. His discoveries of Jupiter, sunspots, the Moon, and Venus were covered in parts one through four of this series. This article will cover Galileo’s observations of the Milky Way, the constellation Orion and star clusters or what we term today as asterisms.

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Switching to iOptron: What I learned from my new GEM45

These are short notes on things I learned about using my new iOptron GEM45 equatorial mount, moving from Celestron mounts (AVX and CGEM). The CEM40 is very similar to the GEM45, and other iOptron mounts are also rather similar. I assume you have the instruction manual for your (actual or planned) iOptron mount; manuals are available on line.

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BASIC EXTRAGALACTIC ASTRONOMY Part 8: Central Supermassive Black Holes - Discovery and Properties

The only primary evidence available to an astronomer about a very remote object consists of photometric measurements, a spectrogram, and an image which is in many cases no more than a pinpoint of light. In this article we present basic cosmological concepts and simplified mathematical methods which allow an amateur to derive from this meager data a surprising number of physical properties of distant extragalactic objects with a precision of several percent within professional results.

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Reopening of The WPF (When Pigs Fly) Observatory

After quite a long time in limbo I recently began to rehabilitate my backyard observatory. It had lain fallow for a couple of years due to life distractions and the rationalization that I could go there any time I wanted. After shoveling out the POD from a recent mid-February snowstorm I went inside to inspect the mount, telescopes, and surroundings.

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The Discoveries of Galileo – Part 4: Venus

Galileo’s discoveries of Jupiter, sunspots, and the Moon were covered in parts 1 through 3 of this series. This article will cover an important discovery that Galileo made in late 1610 of his observations of Venus.

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How to Make a Flat Frame Panel for Dark Sites (Cheap)

Having recently dived into astrophotography, I have found that most problems I face have been faced before, and have a plethora of solutions. Typically, those fall into a couple of categories – expensive, and cheap do-it-yourself. But backyard astronomers being the type of people they are, they tend to share one endearing characteristic – heavily over-engineered for the problem at hand.

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