Horse Head Ha

[Rocket Pooch]

With Atik 314L ZS66 & F.67 reducer, imaging at 260mm approx F4, the field in not flat hence the coma.

[JohnP]

Nice FOV & you got the background curtain very well..

Looks more noisey than I expected (not used to seeing you publish noisey images... ) What was total integration - I know you had to cut this short which is a shame...

John

[Rocket Pooch]

Yes it was 5x10 minutes could really have done with 12-16 subs, never mind, maybe next week?

[Fay]

That is extremely nice Chris, well in focus, lovely curtains

[JohnP]

only 50mins - explains it - great result on a very dim object..

[MarkS]

The curtaining and especially the tendrils are coming out well and there is plenty of other detail appearing - what a pain that you didn't get all the subs you wanted to get the noise down.

Mark

[RobertM]

Another excellent capture and what a FOV!   I know John mentioned noise but it looks quite subdued in the faint areas to me and not entirely surprising for only 50 minutes.  Like the focus and the pinpoint stars, what technique do you use to achieve that ?

From the images I've seen the sky must have been pretty good on Saturday.

[Mike]

Very nice Chris. But why is it the wrong way around?

[Rocket Pooch]

Hi,

The focus was done using Focus in AstroArt it gave FWHM of 1.2 x 1.4 approx for one of the stars in the FOV, very stable skies.

Mike, is it backwards, I never really look?

Chris

[MarkS]

The focus was done using Focus in AstroArt it gave FWHM of 1.2 x 1.4 approx for one of the stars in the FOV, very stable skies.

Is that 1.2 x 1.4 pixels, arcseconds or what?  I'll check my M81 image to estimate my own FWHM.

Mark

[JohnP]

Yes - image is normally presented with flame to left - then again strictly speaking it needs to be rotated through 90 deg... Horsehead is almost directly below Alnitak...

[Tony G]

Hi Chris,

Another great image and with so little effort, the scopes and mount just fall out of the motor, and hey presto, an image, mine fall out and they require collimation and gaffer tape.

Anyway well done.

Tony G

PS Is this one of your missing frames.   



 

 

[MarkS]

The FWHM of the stars in my subs was approx 4 pixels i.e. approx 3 arcsec.  That sounds a bit high to me but this star bloating is made up of 3 effects:
1) Seeing
2) Guiding deviations
3) De-focusing
4) Bayer pixel averaging on the colour CCD - this will bloat stars slightly

Quantifying each effect might be difficult ...

Mark