You think the Astronomik UHC-E would be a good choice for it? Certainly worth a try! I have an actual Lumicon SWAN-Filter. I'll be looking too.

Comet 21/P Giacobini-Zinner




Sept. 10, 2018 at 227 a.m. EDT

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Happy Hunting, all!

 

Don't know 'bout dat. We're supposed to be having pouring rain of "Biblical Proportions" right now. Bright & Sunny at present. Our forecasts' over here have been amazingly wrong lately. And you get what we had quite often. So...

Watch the sky! 21P Giacobini-Zinner is a 'Jupiter-family' comet, and our astro-press has made a point that this one is "Very GREEN." This means it's got a large tail and is comprised of a lot of Cyanogen(>C=N<) which is the simplest 'Cyanide' (or Nitrile in Organic-Chemistry), and is an essential building-block for life (or death). This means it should respond really well to a filter.

Good Luck!

 

Yup, just saw it Monday night, around 2:30am, about 1 1/2 degrees south-southeast of M37. Either Astronomy or S&T had a map, and it was dead easy to find.

In my 5-inch Mak, it was just a fuzzy little ball, maybe 5-8 minutes across.

 

To cloudy around here lately.
Going to have a couple of chances this weekend then we get the remainder of the hurricane.
Going to set the alarm for tonight and see what I got.

 

I hope you get some clear skies! Before the Carolina Water-Moccasins swim up your toilets! Or Colony Gas fixes the gas-main's in Watertown....

 

Very good picture of the comet Dave, that's truly a premium shot. Impressive amount of green too.

 

Well, it's not mine. But I but I agree about the 'green' being very impressive - and that's why I choose it. The green indicates it has a good amount of cyanogen - which I explained the significance of. Or as I call it: 'Cosmic Cyanide' - which if you breathed it it would kill you. But without it, we wouldn't be here. No life would!

The SWAN-Filter is made to bring out the full extent of the tail of gaseous comets. And the green-tails of cyanogen comets is what the SWAN works for.

SWAN-Band Lightbulb-Test​

 

At every light bulb test you will get a like from me @Dave In Vermont For the picture, well, the person who did that, has a lot of skill. And it's a toxic cyanogen comet!

So I understand a UHC filter should have some effect on them too? The swan is it similar to UHC or OIII ?

 

The particular SWAN Filter I have is from Lumicon and is over 10 years old. And they wrote the exact range in nanometers on each filter. That's 'nm's' Nebs. And this one states 494nm to 525nm.

It has an 85% pass at 501nm up to 85% pass at 514nm. Start your own diagram and and start the slope upward at 494nm - peak it 85% at 501nm and start going down at 514nm and end altogether at 525nm. Like an upside-down letter 'U' if you understand.

This is why it's important to learn this 'stuff' if you're going to 'play' with filters in general. The 'new' LUMICON is still the only source for these specialized filters out there. The full name is both "Lumicon Comet Filter" or "Lumicon Swan Band." I wish someone else would come along and make this filter. Maybe Baader? Are you listening, Baader Planetarium in Germany? <Cough! Cough!> <AHEM!>


PS - As I've figured out how to shrink these images from over 2 MB down to around 1.05 MB, I'll get around to publishing my entire collection of these sometime soon. Do remember we can only add an image that's 2MB or under here in A-C. Keep pestering me to remind me to do this? Thanks!


PSS - Lookie what I found! Now from reading my description, how well did I do in the written description? Could you, from words alone, get an image in your mind that resembles this actual transmission-band chart? I'm trying to refine my methodology here, so please respond, Nebs.

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Thanks for the spectral data analysis for the Comet filter. I might try my NPB on the comet eventually, just for fun, I see it has a passband between 425 and 525, wider then the Lumicon Swan but perhaps I could have some positive effects..

I find the analysis of the swan slightly similar to a UHC without the >625nm part that some UHC will let pass.

The Lumicon Swan band Comet filter!

 

Very good to both of you! I agree the UHC-E looks like an excellent chice for comet 21/P - Giacobini-Zinner. And should work as an ersatz OIII, Nebs. UHC in a small scope, too. Based on my knowledge and the 'Miles-O'-Files' too!

Catch you later - no sleep yet. So 'THUD!'

 

No Columbia Gas here in Watertown.
I have only 3 filters.
Orion SkyGlow Filter
Orion Moon Filter
And a brand new TV Nebustar II
May try the SkyGlow on the comet just to see, I have to get up early anyway to try the new TV on Orion.

 

A TeleVue® Nebustar II? Never heard of that before! You've got my attention! Do tell me your findings, please? Thank you!

Off to my futon - it must be feeling neglected!

CrAsH!

 

http://www.eyepiecesetc.com/TeleVue_Bandmate_II_Nebustar_UHC_Nebula_filter_2_p/4501002.htm