M100 - the hundredth image (Tom Gray)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: M 100 · NGC 4321 · NGC 4322 · NGC 4323 · NGC 4328

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M100 - the hundredth image

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M100 - the hundredth image

There are hundreds of images of M100 on Astrobin, and I’m not surprised - it is a spectacular grand design spiral nestled on the edge of the coma cluster, several of which are visible in my image.

Taken over two nights, with some interference from the waxing moon, and variable seeing resulted in me throwing away an hour of subs. In retrospect it might have been better to use 120s subs to improve SNR and reduce background gradients.

Nevertheless I’m pleased to have captured the structure and beautiful blue star clouds which cover the spiral arms, even if the fine detail is smeared out. Using my f6.3 focal reducer, the stars were well shaped, just requiring some reduction.

Lying 55 mLY from us in the Virgo super cluster, M100 contains over 400 billion stars.

UK Astro-Imaging
Schmidt-Cassegrain Telescope (SCT) Imagers
Altair Astro 183 M/C Hypercams
Messier Objects

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	Distinct awarded users	Total awarded images
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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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
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	Advanced success
Started	...
Astrometry.net job	5664773
PixInsight job	PDJO79V5B0FNENTSY7ZKI8L3OZQUFVNJ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h22m49s.573
RA (top/left)	12h23m53s.588
RA (top/right)	12h21m51s.219
RA (bottom/right)	12h21m45s.603
RA (bottom/left)	12h23m47s.886

Dec (center)	+15°46′39″.62
Dec (top/left)	+15°55′30″.64
Dec (top/right)	+15°57′33″.53
Dec (bottom/right)	+15°37′43″.79
Dec (bottom/left)	+15°35′46″.65

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M100 - the hundredth image

M100 - the hundredth image

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M100 - the hundredth image

M100 - the hundredth image

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