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Astrophotography / Re: NGC1333 and surrounds
« Last post by RobertM on Yesterday at 19:34:54 »
Thanks all I'm glad you like it, been on my list for a few years.  I'm a bit busy but should be able to get the final image out plus the other one by or over the weekend.

I took my RH200 but unfortunately I forgot the focus motor controller... yes a Doh moment ! so, luckily, I ended up borrowing a VSD100 refractor to put my ASI2600MC on.  Mount was a AZ-EQ6 rather than the NEQ6 I took since it was already there.  Location wise I was staying at the holiday let of Janet and John Slinn on the IOW; they've decided to give the holiday business up now so no more visits to see them unfortunately.  SQM was 21.2 ish on the clear nights so pretty good within about 45 degrees of the zenith and to the south away from Southampton, Cowes and Newport.  Apparently there are parts of the island that get very close to SQM 22.

So when am I moving away from Tesco's blot... not any time soon I'm afraid so will have to content myself with the odd DSC, holiday, visit or random trip out :(  or perhaps another visit to the IOW :)

Robert
2
Astrophotography / Re: NGC1333 and surrounds
« Last post by The Thing on Yesterday at 11:34:47 »
Very nice Robert, just looked it up - protoplanetary disc in the middle - must be a first for OAS imagers. SQM21, nearly as good as here :) So when are you moving away from Tesco's blot on the night sky? ;)
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Astrophotography / Re: NGC1333 and surrounds
« Last post by julian on Yesterday at 11:14:08 »
Very nice Robert
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Astrophotography / Re: Sh2-174 - HaOIIIRGB - Valentine Rose
« Last post by Roberto on Sep 29, 2020, 13:30:46 »
Thank you Mac, Noel.

Mac, this is a bicolour narrowband image with RGB stars.  I don't actually know if the planetary emits any SII (I doubt it).  The actual mapping of colours for the nebula was:

R = Ha
G = ((OIII*Ha)^~(OIII*Ha))*Ha + ~((OIII*Ha)^~(OIII*Ha))*OIII
B = OIII

The expression ~ in PixInsight means (1-Channel ADU), i.e. the inverse, as images are normalised to 1.

Roberto
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Astrophotography / Re: NGC1333 and surrounds
« Last post by MarkS on Sep 29, 2020, 11:29:41 »
Very nice - looking forward to seeing the end result.

Mark
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Astrophotography / Re: Sh2-174 - HaOIIIRGB - Valentine Rose
« Last post by NoelC on Sep 29, 2020, 09:52:33 »
Roberto
Fascinating; certainly a challenge.

Very nicely processed.

Noel
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Astrophotography / Re: Sh2-174 - HaOIIIRGB - Valentine Rose
« Last post by Mac on Sep 28, 2020, 15:38:58 »
Nice Image,



I dont think i've ever seen this one.

it will be nice to add the blue component, especially as the green and red are pretty good themselves.

Mac.
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Astrophotography / Re: Sh2-174 - HaOIIIRGB - Valentine Rose
« Last post by Roberto on Sep 28, 2020, 14:02:59 »
Hi Carole

Thank you.  It is rather faint but responds equally well in Ha and OIII so that you can create a bicolour image of it.  My FOV is almost 2 degrees a side so not that small.

It's interesting that the parent star of the planetary nebula, white dwarf GD561, which is the very blue star in between the Ha and OIII regions seems to be running away from the shell of dust it created:  http://adsabs.harvard.edu/full/1994AJ....108..978T

Roberto
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Astrophotography / Re: Sh2-174 - HaOIIIRGB - Valentine Rose
« Last post by Carole on Sep 28, 2020, 12:00:26 »
I have never tried this, I suspected it was faint, and small?

You have captured a very nice image Roberto.

Carole
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Astrophotography / Sh2-174 - HaOIIIRGB - Valentine Rose
« Last post by Roberto on Sep 27, 2020, 17:45:16 »
Another lovely Sharpless object; this is the the northernmost in the catalog.

Very difficult one to image - very faint! Had some very good seeing but also very hazy skies for over half of the acquisition time so dealing with gradients was a chore.

Full resolution, bicolour, RGB and annotated versions here:

https://www.astrobin.com/ypasor/H/?nc=user

A is OIII, B is Ha, C is BiColour using the dynamic narrowband tutorial on https://thecoldestnights.com/

Roberto

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