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M31 Sept Oct2020


M31 Sept Oct2020

The Andromeda Galaxy, also known as Messier 31, is a barred spiral galaxy approximately 2.5 million light-years from Earth and the nearest major galaxy to the Milky Way. The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda, which itself is named after the Ethiopian (or Phoenician) princess who was the wife of Perseus in Greek mythology.
The number of stars contained in the Andromeda Galaxy is estimated at one trillion, or roughly twice the number estimated for the Milky Way.
The Milky Way and Andromeda galaxies are expected to collide in around 4.5 billion years, merging to form a giant elliptical galaxy or a large lenticular galaxy. With an apparent magnitude of 3.4, the Andromeda Galaxy is among the brightest of the Messier objects, making it visible to the naked eye from Earth on moonless nights, even when viewed from areas with moderate light pollution.
This image was created using multiple exposures (168 total) of various exposure lengths ranging from 3-6 minutes. The exposures were taken over four nights in September and October. Almost 13 hours of images were originally captured with a final integration of 168 exposures for 9 hours 57 minutes.

Capture and equipment details:
Date(s): Sept. 4, 6, 19; Oct. 2, 3, 2020
Frames: 113x180s, 37x240s, 19x360s, Gain=110, Offset=10, 120 flats, 30 darks, 30 bias
Total time: 9 hours 57 minutes
Bortle Dark-Sky scale: 6
Temperature: -10C (camera)
Imaging camera: ZWO ASI183MC-Pro w/ UV/IR cut filter
Telescope: Astro-Tech 72EDii (72 mm / 432 mm)
Mount: Orion Sirius EQ-G Computerized GoTo Telescope Mount
Guide Scope: William Optics 50mm f/4 (200mm) guide scope
Guide Camera: ZWO ASI120mm-S
Software: NINA, PHD2, EQASCOM, PixInsight






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