Venus and Orion Nebula Observations and Sketches
Posted 24 September 2012 - 01:50 PM
I recently added a couple of observations and sketches to my web page.
The Venus observation and sketch was made last April, but this was the first opportunity I had to scan it in and upload it to my site.
For the sketch I used a TMB 175mm with Baader deep blue (W38A) and yellow (W25) filters for Venus, which seemed to help enhance the dusky appearance in clouds.
It was similar to the last time I observed Venus but there were darker areas within the shading (like mottling) as well as lighter areas. These were not easy to represent in the sketch.
The Baader filters brought out the cusp extensions in the north and south polar regions. The cusps were not visible without the filters:
The Orion Nebula observation and sketch were made back on November 9th-10th 1974.
The sketch was the second deep-sky sketch that I ever made.
In my observing notes I recorded: "A beautiful glowing object." although the nebula appeared green in color I used yellow to represent it in the sketch.
I used an Edmund 4" F/10 reflector with a magnification of 45x. I have seen more detail in the nebula since then, but sometimes it can be fun to look back at old observations:
Posted 24 September 2012 - 02:33 PM
Nice sketches of Venus and Orion Nebula .
Posted 26 September 2012 - 04:14 PM
Thank you for sharing your sketches.
I recognized the Orion Nebula immediately. Nice work!
Posted 26 September 2012 - 07:12 PM
Very fine Venus sketch and M-42 as well.
I have one of those 4.25" f/10 Edmund reflectors. I still take it out once in a while. I bought mine with paper route money back in 1959 for $79. It was a 'dream scope' to me back then and took a long time to save money for it.
Posted 29 September 2012 - 12:50 PM
Thanks. I had planned to add the Venus sketch and later after going through an old log book came across the Orion Nebula sketch so decided to add it as well.
Posted 29 September 2012 - 01:01 PM
Thanks. It was a good scope and it enabled me to see more detail on the planets, Moon, and deep-sky objects.
How do you feel it compares optically with the other scopes that you own?
I decided to go back and look through some of my old Astronomy magazines for the Edmund 4.25" f/10 ad. I came across one from 1975, scanned it in and added it to my web page on my Choosing A Telescope article:
Posted 04 October 2012 - 09:32 PM
I agree with you, it was a thrill to buy and use this scope.
I have attached a photo of the scope taken in 1960. It looks the same today. It works fine, the scope does ring like a bell in the wind and the secondary is a prism and is only about 1/2 wave flat, the primary is spherical and just reaches 1/4 wave but still works ok. I am spoiled today by diffraction limited optics on my other scopes.
Posted 09 December 2012 - 08:08 PM
Looks like your scope came with a wooden tripod while mine came with a metal pedestal mount. So yours may have been a little easier to set up.
I liked the Edmund and it lead me to order a Criterion RV-6 reflector which optically was one of the best scopes I ever owned. It was larger and heavier to set up though than the Edmund so I began to realize the importance of portability and ease of use.
So these days I have smaller scopes that can be easily set up for a quick observing session as well as a larger one when I have more time as I discuss in this article on Telescope Aperture Considerations:
Sounds like you have the same idea with your scopes in that you have your larger 10" scope as well as smaller more portable ones.
Posted 10 December 2012 - 01:36 AM
You are absolutely correct that the good scope which is easier to set up gets the most use. I enjoy the scopes I have and use them all but the 10" scope gets more time under the stars than the 18" scope. If my environment was less urban, that time under the stars would be more equal.
I had my 4.25 inch scope out a few times this past Summer and Fall. It still has it's original reflective coat from more than 50 years ago and looks pretty good.
The article you wrote above is a good one.
Posted 10 December 2012 - 09:07 PM
Yes it looks like we came to the same realization about the importance of portability and optical quality. I enojy all of my scopes but the one that gets the most use is the TMB 105mm f/6.2 because it is so portable.
Thanks for the kind words about the article that I wrote.