[Dawson]

I’ll be there too from the Society for the History of Astronomy with a load of new [old] books to get rid of. Come and say hello.

James Dawson
SHA Librarian

[Dawson]

Thanks both. That is great. Really useful resource. We are after one in colour with a graphic of the Milky Way too and some Messier objects.

James

[Dawson]

Thank you Patrick. Your image is too very nice.

[Dawson]

David,

Thanks for the link, that does explain a lot. Appreciate your help.

James

[Dawson]

Peter, I tested the 20mm glass filter and you are correct, it does block IR. I’ve lost my UV LED so can’t see if it blocking UV too or not.

But as you say, still seems odd for this to sit behind the etalons.

The glass filter is now at least clean so at least I can use it even if I can’t source a new one.

Thanks.

James

[Dawson]

Peter,

Thank you very much.

I think that is my confusion. If only 656nm gets through the etalon, why is there a UV/IR blocking filter behind it, as the etalon will have filtered out those wavelengths already.

James

[Dawson]

It has been purposefully painted to look like a glass cylinder; the white paint strategically placed to show it reflecting light coming from the left, and to give the appearance of glass. So I don’t think this represents an unfinished telescope. I would be skeptical that it is a telescope as I’m not aware of glass refractors, or why you’d want one. The end cap of the glass tube is different to the ends of the telescope near it on a mount.

We need an expert in glass artefacts of the C17th to indicate what a glass cylinder might have been used for. I was wondering what other material it could be; plastics weren’t known, rock crystal seems unlikely, ice again seems unlikely. So I would have thought it does represent glass.

Interesting story.

[Dawson]

There looked to be a few potential candidates, but most bright things were not meteors

[Dawson]

Maybe a 50% reduction after 50 years, one percent for each year of membership?

[Dawson]

Personally, I think if a society pays for affiliated status it shows a certain amount of commitment. I would have kept paid affiliated status which only entitles the society to a paper journal and the handbook, no access to online stuff other than membership stuff. Unless affiliated societies pay up, and maybe the cost should be related to the number of members like the FAS, there is nothing special about affiliated membership, and all those societies who have been paying and supporting the BAA for years will now just get the same as everyone else jumping on the free-bandwagon.

James
Nottingham Astronomical Society (affiliated to the BAA)

[Dawson]

Fascinating post, thank you.

James

[Dawson]

Well you’ve done your bit and raised the issue on this forum for all to see, and to show how passionate you are about the matter. It is up to Council to decide if it is worthy of their time to discuss it further and/or take action.

[Dawson]

Steve, the obvious answer is for you to join the Council, debate the matter, and convince everyone else to vote a different way.

I can see you are annoyed by this, but I suspect it is VERY low down anyone else’s priority list.

James

[Dawson]

A great day of talks and catching up with people, and a great venue too. Well done to the organisers and speakers!

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[Dawson]

This is the purpose of the survey, to ascertain what you want. Do you want more pages in the Journal? If you do, what do you want on those pages? More of the same, or something else?

The survey has been designed to be as open to ideas as possible.

James

[Dawson]

Thanks Chris. I think an article or the like about this would be very good.

[Dawson]

Mike, it is a massive undertaking to record one meeting, let alone three days’ worth of meetings. And that is just the recording of audio and video, putting microphones on speakers, along with capturing the slides, let alone the subsequent editing, matching of sound and video, labeling, electronically adjusting lighting and sound, and then uploading, plus checking nothing infringes copyright and seeking speaker permissions. It really is a massive job, and not an enjoyable one for a volunteer.

[Dawson]

What a great weekend it was Pauline.

[Dawson]

I’ve resolved the streaking comet. Now I have streaking stars when they are not meant to be. An overly stretched image shows the subtle streaking. I’ve posted this question on SGL too, but I do wonder if this is somehow related to my flats or darks, or maybe because I had the ISO too high (3200 for Canon 6D). More work in progress. It is just a case of finding the time to sit down and change the myriad of variables, stack and see if things have improved. I am SLOWLY getting there.

https://stargazerslounge.com/topic/407703-streaky-stars-in-dss-comet-stack/

James

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[Dawson]

Thanks Peter. I think I may have discovered the issue. I hadn’t appreciated it was possible to use roller ball on my mouse to zoom right into the comet to get a better placement of the purple ring, and also I hadn’t been pressing the save icon on the right, under the comet icon. I’m still not sure if I am meant to press the save icon on EVERY sub, or just at the end of marking the comet on all the subs. Anyway, the first stack I’ve done since implementing these changes seems to be OK, now I’m trying to keep the stars and comet static so it taking my poor laptop even longer!

I will report back with results.

Thanks for replying.

James

[Author]

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