M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6 (altazastro)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: IC 4277 · IC 4278 · M 51 · NGC 5194 · NGC 5195 · Whirlpool Galaxy

M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6, altazastro

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M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6

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M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6

A decent long integration with a good resolution, comparing this image with the one taken with the same optics and the 385MC OSC camera on May 05 2021 one can realize first hand how a monochrome camera provides better resolution.

Also, without the need to keep color information, a Fringe Killer filter was used instead of the IR CUT one, reducing the chromatic aberration induced in the 0.5X focal reducer (a simple achromatic doublet) and hence producing smaller stars.

Small galaxies IC4278 and IC4277 can be seen close to M51: while IC4277 is about 15.3, according to Cartes du Ciel IC4278 has a magnitude of 17.79.

This may mean my night sky is a tad better than the 17.8 (taken from the Clear Outside app) that I usually quote in my picture info.

However it must be said I have had a couple of good days, with rain and wind in the day and calm clear skies (at least until clouds set in) at night.

I will use magnitude 18-Bortle 8 for my sky from now on.

Low-Cost Astrophotography
Broadband under Bortle 7/8/9

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	Distinct awarded users	Total awarded images
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	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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Unknown

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	Basic success
Started	...
Astrometry.net job	4497626
PixInsight job	n/a
PixInsight queue size	n/a
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M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6

M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6

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M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6

M51 - Whirlpool Galaxy - 20210513 - Celestron C6 at F4.6

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