M100 Galaxy (Steve Robbins)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: IC 3313 · IC 787 · M 100 · NGC 4312 · NGC 4321 · NGC 4323 · NGC 4328 · NGC 4379

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M100 Galaxy

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M100 Galaxy

This was an experiment with shorter exposures for Lum (37sec X 236) to try and reduce the impact of the Bortel 5 skies.

M100 is a beautiful Grand Design Galaxy in Coma Berenices and was discovered by Pierre Mechain in 1781. It was one of the first spiral galaxies to be discovered. It is about 55Mly away and in a galaxy rich area of the sky. At 107,000ly across, it is 60% as large as the Milky Way Galaxy. There are at lest 18 additional galaxies visible in this image. The title Grand Design is given because it has prominent and well-defined spiral arms, as opposed to multi-arm or spirals which have subtler structural features. The spiral arms of a grand design galaxy extend clearly around the galaxy through many radians and can be observed over a large fraction of the galaxy's radius. Approximately 10 percent of all known spiral galaxies are classified as grand design type spirals.

To try and pull out the faint elements in the arms of the galaxy in the light pollution of Bortel 5 skies, I went to 37 second exposures at a gain of 76 and took 236 Lum exposures to separate the galaxy from the light pollution. Each sub didn't look very impressive but the stack really looked good. I then combined with RGB.

37sec X 236 Lum
150Sec X 43 R
150Sec X 40 G
120Sec X 40 B

The refractors!
ZWO ASI1600MM/QHY163M
Suburban Astrophotography

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	Distinct awarded users	Total awarded images
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This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	5107052
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M100 Galaxy

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M100 Galaxy

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