How to tell if there is Sii in a region? - Forums

Topic starter

Jul 19, 2023

Hi friends,

When planning targets, I find it fairly easy to know which areas have Ha and Oiii, just from looking at other images and various surveys on Telescopius (DSS Red, etc.)

I'm having a hard time finding if a target has any Sii, and if it's worth spending hours and hours on Sii when the target might be better off as HOO.

I know it's fairly easy to tell by looking around on Astrobin and seeing if people have piled on Sii data for a particular target, but I'm working on a region that doesn't have a lot of images, and it's hard for me to tell if there is Sii in the region.

Thanks in advance for your help, and clear skies!

Jeff

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Salvatore Iovene

Admin

IOTD Staff

Frequent contributor

Jul 19, 2023 · Edited: Jul 31, 2023

This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

EDIT: this is done now, please see some messages down this topic!

Jeffrey Horne

Topic starter

Jul 19, 2023

Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

I love this idea, @Salvatore!

Steve Spring

Jul 19, 2023

Great question Jeffrey,

I shoot OSC with Ha/Oiii dual band so no experience with SI at all.

Would love to give it a try especially as there are now a couple of Oiii/Si dual band filters appeared on the market.

CS

Steve

Lynn K

Jul 19, 2023

Because indivigual post processing can vary, it may be difficult to determine the amount of SII in an object from a photograph. I just bin the camera 4x4 and do a 3 to 5 min test image. Or may have to take 3 to 5 images and do a quick stack. This may take a little time, but less than culling through Astrobin. Or wasting hours on non productive data.

Lynn K.

Concise

Tareq Abdulla

Jul 19, 2023

The problem is if doing a large wide FOV or even Mosaic which you can get some areas with SII and other areas weak to no SII signal, so you don't know if you should include SII or not, for example the Veil, it is Ha/OIII perfectly, i didn't see much of SII there even if it is included, while NA/Pelican are rich with SII, Crescent isn't much of SII region while Tulip is, so if i image Cygnus region, parts are perfectly Ha/OIII alone and parts need to be SHO.

Lynn K

Jul 19, 2023

My comment was in regard to using a mono CCD/CMOS camera with individual Ha, OIII & SII filters, not OSC dual band.

Lynn K.

Christian Bennich

Jul 19, 2023

Jeffrey Horne:
Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

I love this idea, @Salvatore!

+1 for this idea as well 👍👍

Mickaelle (kaelig)

Jul 19, 2023

I have discovered recently thank to an astromical friend, the excellent work of Gary Imm (which is here on our forum). It is an amazing job with a lot of informations & with an information about the filter to be used.

http://garyimm.com/compendium

Eddie Bagwell

Jul 20, 2023

Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

Great idea and please make it available to all subscription levels. Thanks!

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Frank Alvaro

Jul 20, 2023 · Edited: Jul 20, 2023

Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

Coincidently, without having previously read this thread, I was using the search function yesterday to see if "filter type" was an option...so I would happily see this feature implemented

Tareq Abdulla

Jul 20, 2023

+10 for that filters search idea

Stuart Taylor

Jul 20, 2023

Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

Yes please Salvatore!

Jonny Bravo

Jul 20, 2023

Tareq Abdulla:
The problem is if doing a large wide FOV or even Mosaic which you can get some areas with SII and other areas weak to no SII signal, so you don't know if you should include SII or not, for example the Veil, it is Ha/OIII perfectly, i didn't see much of SII there even if it is included, while NA/Pelican are rich with SII, Crescent isn't much of SII region while Tulip is, so if i image Cygnus region, parts are perfectly Ha/OIII alone and parts need to be SHO.

No S2 signal in the Veil? My data begs to differ with that assertion...

Data acquired with my 294MM Pro, GT81 and a Chroma 3nm S2 filter.

If it weren't for people trying certain not-often-used filters in certain portions of the sky, we would never have discovered that lovely O3 around M31: https://www.astrobin.com/1d8ivk/#

So, I say try it. Who knows, maybe you'll find some previously unknown S2 region somewhere

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Gary Seven

Jul 20, 2023

If it is not a Planetary Nebula, I assume it is there and run a few 5 minute test exposures.

Often it turns up - the only question is if the amount is worth devoting time to.

Tareq Abdulla

Jul 20, 2023

Jonny Bravo:
Tareq Abdulla:
The problem is if doing a large wide FOV or even Mosaic which you can get some areas with SII and other areas weak to no SII signal, so you don't know if you should include SII or not, for example the Veil, it is Ha/OIII perfectly, i didn't see much of SII there even if it is included, while NA/Pelican are rich with SII, Crescent isn't much of SII region while Tulip is, so if i image Cygnus region, parts are perfectly Ha/OIII alone and parts need to be SHO.

No S2 signal in the Veil? My data begs to differ with that assertion...

Data acquired with my 294MM Pro, GT81 and a Chroma 3nm S2 filter.

If it weren't for people trying certain not-often-used filters in certain portions of the sky, we would never have discovered that lovely O3 around M31: https://www.astrobin.com/1d8ivk/#

So, I say try it. Who knows, maybe you'll find some previously unknown S2 region somewhere

I mentioned this region and also Crescent because i saw people captured those in SHO and HOO and i hardly to see difference, it is like there is no SII, or very slightly there that can be neglected, unless people don't know how to process it to show it clearly.

Jeffrey Horne

Topic starter

Jul 20, 2023

Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

@SalvatoreI've been thinking about this...I assume you mean that you could search for images taken with any Sii filter, not just a particular brand, right? That makes a lot of sense as a future feature!

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Salvatore Iovene

Admin

IOTD Staff

Frequent contributor

Jul 24, 2023

Jeffrey Horne:
@Salvatore I've been thinking about this...I assume you mean that you could search for images taken with any Sii filter, not just a particular brand, right? That makes a lot of sense as a future feature!

That's right. This is most likely going to be released tomorrow. You will be able to search images acquired with a certain filter type (or combination or filter types).

E.g. want SHO images? Search for Ha + SII + OIII filter types.

Salvatore Iovene

Admin

IOTD Staff

Frequent contributor

Jul 25, 2023

Have fun everybody! 🎉

Michael W. Dean

Jul 25, 2023

Salvatore Iovene:
This gives me an idea to add a search filter to find images that have been acquired with a certain type of filter 😃

Yes please!

Salvatore Iovene

Admin

IOTD Staff

Frequent contributor

Jul 25, 2023

@Michael W. Dean see the message just before yours, it was just released!

Arun H

Frequent contributor

Jul 25, 2023 · Edited: Jul 25, 2023

Salvatore Iovene:
Have fun everybody! 🎉

Seems like it needs an Astrobin Ultimate subscription

Salvatore Iovene

Admin

IOTD Staff

Frequent contributor

Jul 25, 2023

Arun H:
Seems like it needs an Astrobin Ultimate subscription

Hi Arun, yes, sorry that I couldn't make it available to all subscription tiers. All other more specific filters are under Ultimate too, and of course I need to have as many people as possible on Ultimate in order to continue and provide an excellent platform for all of you.

As I've mentioned somewhere in the past, personally I'd be the happiest if I could get rid of these tiers, and make a single plan, cheaper than Ultimate is currently.

But this is a risky move that I don't feel comfortable doing at the moment, until I do extensive polling of current and potential customers to understand if it's a viable option that won't reduce revenue.

The good news is that you can upgrade and get a refund for the unused portion of your Premium.

AstroBin Ultimate is $5.75 USD per month, when paid yearly, if I recall correctly, so I don't think that's unfair to ask for a platform that is continually improved.

Thanks for considering!

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Arun H

Frequent contributor

Jul 25, 2023

Salvatore Iovene:
AstroBin Ultimate is $5.75 USD per month, when paid yearly, if I recall correctly, so I don't think that's unfair to ask for a platform that is continually improved.

Hi Sal, I don't think it is unfair at all! Actually, I had not realized the savings if paid yearly. I suspect if you add a blurb saying "savings of $20 if paid yearly", more people might choose Ultimate.

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Salvatore Iovene

Admin

IOTD Staff

Frequent contributor

Jul 25, 2023

Arun H:
Hi Sal, I don't think it is unfair at all! Actually, I had not realized the savings if paid yearly. I suspect if you add a blurb saying "savings of $20 if paid yearly", more people might choose Ultimate.

Thanks for being so understanding! Actually, the default payment period is yearly (you have yearly but non-auto-renewing).

When you click the Monthly toggle, you can see the price change and when you are on the actual payment page, AstroBin does already tell you "Save ~20% by switching to a yearly payment" so it's already set up