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Contains:  Merope nebula, NGC 1435, Maia nebula, NGC 1432, The star Pleione (28Tau), The star Atlas (27Tau), The star ηTau, The star Merope (23Tau), The star Sterope I (21Tau), The star Taygeta (19Tau), The star 18Tau, The star Electra (17Tau), The star Celaeno (16Tau)
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M45, 





    
        

            Leo Shatz
M45

M45

Technical card

Resolution: 2868x2340

Dates:Oct. 19, 2017

Frames:
11x15" -15C bin 1x1
15x60" -15C bin 1x1
32x600" -15C bin 1x1

Integration: 5.6 hours

Avg. Moon age: 29.25 days

Avg. Moon phase: 0.09%

Bortle Dark-Sky Scale: 2.00

Temperature: 16.00

Astrometry.net job: 1798278

RA center: 56.837 degrees

DEC center: 24.173 degrees

Pixel scale: 2.854 arcsec/pixel

Orientation: 179.858 degrees

Field radius: 1.467 degrees

Locations: Negev Desert, Mitzpe Ramon, Israel

Data source: Traveller

Description

First light with QHY367c camera from Negev Desert (this site was recently declared by IDA as officially recognized natural reserve).

This is cropped view from larger frame. There were few reasons for presenting the cropped version: I've made a mistake during manual camera angle selection: I wanted to orient the FOV to 90 degrees, but by mistake set it about 0, so that some large part of the resulting FOV was less interesting (I could reorient the camera, but decided not to spend extra time on that). The other reason for crop was time it took for new version of PixInsight to perform Local Normalization on full frame - it quickly caused entire RAM on my processing machine to be consumed and it started very heavy use of paging file. If I've left the PC running this was for hours, it could have killed my HDD. Doing the Local Normalization after significant amount of crop was much lighter and took less than an hour without causing too much of HDD paging activity. As alternative, I could have split the image into at least two overlapping images, then run the LN and II separately on each panel and then merge them together as mosaic.

Anyways, I'll need to upgrade amount of RAM on my machine from 18GB to something bigger, maybe 24GB.

Regarding the new camera I've used for this image, QHY367c, I pretty much like the results I'm getting. It's very sensitive, very low read and dark noise. In fact, since I didn't have time to acquire the dark frames, this image was processed without any dark frames calibration at all, only bias and flats were involved. I also tried to use the camera tilt angle adapter with limited success, since I couldn't yet find matching software for making efficient angle adjustments. I need to research more on this subject.

QHY367c/APM107-700/Mach1 GTO
Gain:1208, Offset:10
32x600s,15x60s,11x15s

Comments

Author

spinlock
Leo Shatz
License: Attribution-NonCommercial Creative Commons
3950
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M45, 





    
        

            Leo Shatz