WolfieGlos

Lovely detail in the core, with a nice and colourful, star filled background. Intrigued why you framed it with the galaxy in the corner? Was it simply to pickup PGC 1933339?

Nice image Craig, the owl stands out well. When I imaged this one, I overstretched the stars and the owl got lost a little, but yours is obvious 👍 I also got diffraction spikes in my subs on Thursday night, although I’ve no idea what caused them currently.

Nice capture Lee, and welcome back 🙂 The ball is interesting, look forward to seeing what you captured using it.

Nice image Steve, I like the Ha and dust that's coming through in the arms. Coincidently I have been capturing data on this one for the past two nights, just over 4.5 hours so far which I'm processing at the moment.

Goran has two of them, I’m sure he can advise a councillor to help 😄

Potentially 3 clear nights here; last night it was from 8pm through until 6am, tonight has been hit and miss but is currently clear (all forecasts vary), and supposedly tomorrow is clear too! Work nights too… but working at home makes it easier to deal with 😁

Same, but then that was because I had to do it manually on the star tracker, a right pain. It convinced me to get the HEQ5, and dithering made a difference like night and day.

I have read on SGL and CN, that with modern cooled cameras that dithering isn't required. I can't really comment on that, since I have used both a DSLR and my uncooled 585mc for DSO, and I always dither or else I do get walking noise. Darks do help to mask it, but it is still there, so I dither to be safe. I think the answer is to try it without dithering, and then create two stacks; one with darks, and one without, and see what result you get. Perhaps a short session (say an hour) on a star cluster during a Full Moon would be an ideal test, since you wouldn't lose much time that way, and the walking noise wouldn't be as apparent since all you are really after is the stars.

Nice image Craig, plenty of colour and a nice field of stars whilst M39 is prominent too.

Never seen it called the bat before, and that’s a different way of framing it. Nice job.

Nice image Goran! I like the framing and how the Pelican is "photo-bombing" in the corner! Is that a "soap bubble" nebula in your image, towards the upper-right portion of the image? It's not labelled on the AB annotation, just the left of LBN 380. Speaking of which, that appears to be faint, I guess a LOT of OIII would be required to bring it out.

Been away for a few days, so here is my late reply! I've just run a test, and this is the window that Siril gives when saving as a TIFF file: Below, in italic, is the full copy+paste, and I can also see the same type of "History" data saved at the bottom from Fits files, and even PixInsights XISF file format on other files that I have just looked at. You can also add your own text to this if you like, before saving. SIMPLE = T / file does conform to FITS standard BITPIX = -32 / number of bits per data pixel NAXIS = 3 / number of data axes NAXIS1 = 3538 / length of data axis 1 NAXIS2 = 1990 / length of data axis 2 NAXIS3 = 3 / length of data axis 3 EXTEND = T / FITS dataset may contain extensions COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H MIPS-FHI= 1 / Upper visualization cutoff MIPS-FLO= 0 / Lower visualization cutoff BZERO = 0 / offset data range to that of unsigned short BSCALE = 1 / default scaling factor DATE = '2024-09-30T23:08:14' / UTC date that FITS file was created DATE-OBS= '2024-09-10T20:18:43.653000' / YYYY-MM-DDThh:mm:ss observation start, INSTRUME= 'ZWO ASI585MC' / instrument name OBSERVER= ' ' / observer name TELESCOP= 'Starfield 102' / telescope used to acquire this image ROWORDER= 'BOTTOM-UP' / Order of the rows in image array XPIXSZ = 2.9 / X pixel size microns YPIXSZ = 2.9 / Y pixel size microns XBINNING= 1 / Camera binning mode YBINNING= 1 / Camera binning mode FOCALLEN= 574.424 / Camera focal length CCD-TEMP= 14 / CCD temp in C EXPTIME = 120 / Exposure time [s] STACKCNT= 413 / Stack frames LIVETIME= 49560 / Exposure time after deadtime correction EXPSTART= 2.46056e+006 / Exposure start time (standard Julian date) EXPEND = 2.46057e+006 / Exposure end time (standard Julian date) IMAGETYP= 'LIGHT ' / Type of image OBJECT = 'NGC 6946' / Name of the object of interest CVF = 0.620981 / Conversion factor (e-/adu) GAIN = 252 / Camera gain OFFSET = 15 / Camera offset CTYPE1 = 'RA---TAN' / Coordinate type for the first axis CTYPE2 = 'DEC--TAN' / Coordinate type for the second axis CUNIT1 = 'deg ' / Unit of coordinates CUNIT2 = 'deg ' / Unit of coordinates EQUINOX = 2000 / Equatorial equinox OBJCTRA = '20 33 32.093' / Image center Right Ascension (hms) OBJCTDEC= '+60 21 29.750' / Image center Declination (dms) RA = 308.384 / Image center Right Ascension (deg) DEC = 60.3583 / Image center Declination (deg) CRPIX1 = 1769 / Axis1 reference pixel CRPIX2 = 995 / Axis2 reference pixel CRVAL1 = 308.384 / Axis1 reference value (deg) CRVAL2 = 60.3583 / Axis2 reference value (deg) CDELT1 = -0.000289257 / X pixel size (deg) CDELT2 = 0.000289262 / Y pixel size (deg) PC1_1 = -0.231492 / Linear transformation matrix (1, 1) PC1_2 = 0.972837 / Linear transformation matrix (1, 2) PC2_1 = -0.972825 / Linear transformation matrix (2, 1) PC2_2 = -0.23154 / Linear transformation matrix (2, 2) PLTSOLVD= T / Siril internal solve AIRMASS = 1.01239 / Airmass HISTORY mean stacking with winsorized sigma clipping rejection (low=3.000 high=3 HISTORY .000), additive+scaling normalized input, normalized output, no image we HISTORY ighting, equalized RGB HISTORY TOP-DOWN mirror HISTORY Crop (x=111, y=69, w=3538, h=1990) HISTORY Background extraction (Correction: Subtraction) HISTORY Photometric CC HISTORY Asinh Transformation: (straaaetch=1000.0, bp=0.00000) END You can then access this information later on in Windows Explorer as below, by right-clicking the file, choosing properties and going to the Details Tab. Then you can copy+paste it to notepad (or word, etc) to see it all. The "Details Tab" in Windows Explorer appears only on TIFF files for some reason, I've no idea why that might be. But you can actually open up a Fits file in Siril, then save as a TIFF, and the box (above) appears again with the history I used to save these histories into Notepad, and add my own notes to it, if for instance I edited 70% in Siril and then took it to GIMP, so I'd know exactly how I processed it.

Siril also saves this data in the file, when you save you may notice the window that appears showing your processing history. You can copy+paste it into Notepad or something, but if you forget or want to check an older one, then right-click on the fits file, go to properties and then on one of the tabs (I think it’s comments), it’s all saved there. I used this a lot when I used Siril, but it wasn’t complete so I added to it. For instance it would tell you the values for AsinH and colour saturation, but not GHS. So I used to add them when saving the file, so I’d know for future 🙂

Thanks Michael. I must admit, I wasn't aware of Interstellar Reddening, but having now just researched it, it makes perfect sense and explains the colour of this one compared to, say, M13 considering their locations in the night sky. I'm away for a week from tonight, but that's definitely something I'll look at upon my return. This version I found shows the effect well by just hovering the mouse over: http://bf-astro.com/m71/m71.htm Thank you for bringing this to my attention!

Captured during the recent "Supermoon", this image is an hour's worth of data captured before I slewed to Saturn for some planetary imaging for a change. I had hopes of going for the "trifecta" by then following up with some Lunar imaging with the partial eclipse, but alas, the clouds rolled in before then. I also managed to capture an hour on another cluster, or so I thought, when I realised I had only captured half of it due to a framing error on my part 😒 I think I can just make out the angelfish, with the tail to the top of the cluster, head facing south. This image lacks any faint fuzzies; not even any "PGC" galaxies could be found, and only a handful of quasars none of which are visible in my image with the short total time. So this really is a colourful and yet barren field of view. ZWO ASI 585mc + Starfield 102ED + 0.8 Reducer on HEQ5 Astronomik L2 UV/IR Filter Gain 252, 67 x 60s frames TOTAL TIME: 01:07:00 Stacked in SIRIL Edited in Pixinsight, XT Suite, GraXpert and GIMP Comments welcome as always.