Messier 31-8.5hrs

[bottletopburly]

M31 8.5 hrs over three nights so far , dithered frames , bias as darks and flats guided on an Eq6 , Tecnosky 70/346mm quadruplet , stacked in DSS , processed in Startools , comments most welcome , not quite sure star colour quite right , what do you think? Had problem with flats hopefully now sorted 

 

[PeterCPC]

No the colour is not right but you have clipped the black point I think. I think that you could get much more out of the data.

Peter

[bottletopburly]

1 hour ago, PeterCPC said:

No the colour is not right but you have clipped the black point I think. I think that you could get much more out of the data.

Peter

Thanks peter  will look into that , 

[jager945]

This looks quite good to me. I would have expected a somewhat deeper and more noise free signal for 8.5h though. What instrument did you use to acquire the data? How is the light pollution at your location?

I can't quite place Peter's comments about the colours and clipping however...

The foreground stars show all temperatures of the black body curves equally (red->orange->yellow->white->blue are all accounted for). The yellow core is present (older stars), the bluer outer rim is correct (younger OB stars, more star formation), the all too often neglected purple/pink HII areas (as can be corroborated/seen here) are just about coming through in the outer rim (responsible for the star formation), the red/brown dust lanes are present. You have produced a scientifically valuable image in terms of coloring of temperatures and emissions. Finally, your histogram looks just fine to me and shows no clipping that I can see;

I'd say nicely done!

[PeterCPC]

This is the histogram with Affinity Photo - looks clipped to me.

Peter

 

[bottletopburly]

55 minutes ago, jager945 said:

This looks quite good to me. I would have expected a somewhat deeper and more noise free signal for 8.5h though. What instrument did you use to acquire the data? How is the light pollution at your location?

I can't quite place Peter's comments about the colours and clipping however...

The foreground stars show all temperatures of the black body curves equally (red->orange->yellow->white->blue are all accounted for). The yellow core is present (older stars), the bluer outer rim is correct (younger OB stars, more star formation), the all too often neglected purple/pink HII areas (as can be corroborated/seen here) are just about coming through in the outer rim (responsible for the star formation), the red/brown dust lanes are present. You have produced a scientifically valuable image in terms of coloring of temperatures and emissions. Finally, your histogram looks just fine to me and shows no clipping that I can see;

I'd say nicely done!

Thanks ivo 👍 imaging  equipment canon 1000d Astro Modified ur filter removed , Tecnosky 70 Q /346mm quadruplet 

idasD2 filter  , Stacked in deepskystacker (wb from camera  not sure if I should have checked that ) processed in startools ,  taken from my location on edge of town  , led  street lights fitted all around town bortle 6 sky 

[szymon]

10 minutes ago, PeterCPC said:

This is the histogram with Affinity Photo - looks clipped to me.

Peter

 

Something odd with your software -- histogram looks fine, e.g. in GIMP:

or in a random online tool https://pinetools.com/image-histogram

 

[jager945]

1 hour ago, bottletopburly said:

Thanks ivo 👍 imaging  equipment canon 1000d Astro Modified ur filter removed , Tecnosky 70 Q /346mm quadruplet 

idasD2 filter  , Stacked in deepskystacker (wb from camera  not sure if I should have checked that ) processed in startools ,  taken from my location on edge of town  , led  street lights fitted all around town bortle 6 sky 

Say no more. IMHO, that's not bad at all for Bortle 6 and a 1000D!  Light pollution is such a killer for fainter objects.

The mod explains how you were able to get the HII areas showing. Nice!