Re: A night of open clusters and double stars

Hi Larry,

My typical visual magnitude lies between 4.5 and 5.2 in the Zenith. But you are right about the filters. They don't really work in combination with my telescope and eyepieces. For others (or other objects!) they may work. I know that the OIII from Lumicon is really fantastic on M 17 and the Veil nebula. For M 42 the Lumicon UHC is my favorite.

Clear skies
Math


Larry Stedman wrote:

Nice blog report... those are a good set of clusters. And you spotted the key feature of M77. It's one of those Seyfert galaxies with a bright active core. If you aren't familiar with the SEDS site, you're in for a real treat. http://www.seds.org/~spider/spider/ScholarX/seyferts.html

As to the filters... Phil Harrington wrote a report in Astronomy magazine recently rating various filters and reported some modest improvement with the broadband filters on non-nebulous objects under lighter skies. Obviously that's not true, so far, for your scope and conditions.

But the filters still have their uses. In my observing conditions (LM maybe 4.5), I find that broadband filters (Orion SkyGlow) work well in an Astroscan on nebulae. They also work nicely on Mars.

Larry Stedman
Vestal

.

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