M81 and M82 galaxies, 2025
12 million light years away from us, the magnificent M81 and M82 galaxies, two distant from us cosmic islands that have been fighting together gravitationally for a billion years.
Tech Card
Date / Location
27th February, 28th February, 1st March, 2nd March, 5th March, 6th March, & 18th March 2025, Warwickshire, GMT+0, United Kingdom, Bortle Class 4 ~SGM: 21.26 mag./arc sec2
Equipment
Camera: ZWO ASI 1600MM PRO
Filters: Astrodon LRGB Gen2 E-Series Tru-Balance Filterset 1.25 inches, Astrodon HA 5nm 1.25 inches
Imaging Telescope: Takahashi FSQ-85ED
Correcting Lens: Takahashi Flattener 1.01x (composite focal length at 455mm and focal ratio at f/5.4)
Mount: Takahashi EM-400 Temma 2M guided with a Takahashi GT-40 guide scope and ZWO ASI 120MM mini guide camera
Image Quality
12Bit ADC (FITS)
Exposure time per image / number of composites and sensitivity
40 x 300s Ha (139G 21B, BIN1, -20C)
32 x 600s Ha (200G 50B, BIN1, -20C)
69 x 300s L (139G 21B, BIN1, -20C)
21 x 300s R (139G 21B, BIN1, -20C)
18 x 300s G (139G 21B, BIN1, -20C)
22 x 300s B (139G 21B, BIN1, -20C)
Total Integration Time
approx. 7hrs 30mins
Calibration Frames
16 Darks, 24 Flats
Software
Bisque TheSky Pro
SharpCap Pro
PHD2
PixInsight 1.8 Core
Photoshop
DEEP SKY
STARSCAPE
SOLAR SYSTEM
EVENTS
