The annual M42 this year is a mosaic with the Running Man. APP dealt with the gradients really well after messing with the Normalisation and Integration parameters.
M42, NGC 1977
250mm f4. Newtonian MPCC
QHY168c @-15°C IDAS P2
10x180s each pane, 2/10 Darks, flats, dark-flats
APP, Photoshop, Topaz DeNoise AI
Mosaics in APP – defaults unless otherwise stated 1. Load – all as normal – you don’t need to use separate sessions for each frame if you did it all at the same time 2. Calibrate as normal 3. Analyse stars – I needed to increase from 500 or it wouldn’t work – went 1400 – might have been the subject but I suspect it helps to stitch the mosaic together 4. Register – Registration mode – mosaic, use dynamic distortion model, uncheck same camera and optics (will be suggested if you don’t) Scale stop = 1 (for a 10% mosaic overlap) 5. Normalize – Mode – advanced – neutralize background LNC degree – 2nd degree, iterations 3 6. Integrate – Enable MBB – 10% because I did 10% overlap in the mosaic INTEGRATE – and if you’re lucky it all works
Testing out and configuring replacement laptop after old one got washed away in observatory leak! Took a few frames of the Running Man nebula. Topaz is great for removing noise in images with too few frames. This only had 4 frames and once stretched was very noisy. Looks great after Topaz-ing.
NGC1977 Running Man Nebula Orion
2020-12-16 23:18UT Poor seeing, guiding 0.8″ and a little windy
250mm f4.8 Newtonian MPCC, IDAS P2
QHY 168C @15°C Gain/offset 2/20
5x180s 1×1 darks, bias only – so a little vignetting, removed in processing
Bringing out the all the dusty, dark material leaves me with a horrible background.
Iris Nebula NGC 7023 / C4
2020-09-19 Mag. 6.8
250mm f4.8 Newtonian, MPCC
QHY168C @15°C 2/20 gain/offset IDAS P2
28x180s 10/50 darks, flats, bias
The Iris Nebula is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487. The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated SAO 19158. Wikipedia
New camera testing. Different way of working with Gain and Offset needing to be chosen and probably using more shorter exposures than the CCD. 32Mb lights instead of 10Mb for the CCD means much longer processing in APP. Couldn’t use the flats as I moved the camera between flats and lights.
NGC6992 Eastern Veil Nebula
Mag. 7, Size 3°
250mm f4.8 OO Newtonian MPCC
QHY168c @-15°C Gain/Offset: 10/50 (unity) No filters
Imaged areas around this a lot for HOYs but never this actual part. First time back using the MPCC without the LP filter this time to avoid internal reflections. Stars are better at 3 corners but top right still off – probably focuser alignment.
This is a bit of a weird looking one! Stars to the left aren’t good shapes – probably combination of optical alignment, focus and collimation. Stars are over-processed too – should have been so much better.
IC1695 Fish head nebula (part of the Heart nebula)
Sh2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula. Sh2 designation because it’s part of the Sharpless Catalog (1959) of 312 HII regions. About 2400 light years from Earth and a stellar nursery.
Narrowband filters really do cut through the murky, light polluted skies of Edinburgh so well. Obviously false colour, has to be for narrowband, but can’t decide which is the best so two different tone mappings: SII Ha OIII -> RGB and Ha OIII SII