M 23: An Open Cluster that Stands Out in Sagittarius (Fernando)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: M 23 · NGC 6494

M 23: An Open Cluster that Stands Out in Sagittarius, Fernando

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M 23: An Open Cluster that Stands Out in Sagittarius

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M 23: An Open Cluster that Stands Out in Sagittarius

M 23 is a glorious open cluster in Milk Way, in Sagittarius canstallation. Laying in an apparent diameter of 15 light years (27 arc-minutes), the cluster has about 150 members, with less than 10% chance of being "field stars".

However studies suggest that much more stars belong to M-23.

The hottest stars in M23 are of spectral type B9, the brightest star are of magnitude 9.21. The age of M23 has been estimated at 220 - 300 million years (Sky Catalog 2000).

The distance to Earth is about 2000 Light Years

Image:

Due to the claudy weather I decide to capture just a few frames, based on the S/N of one frame of 300 sec taken with my 120mm refractor.

L=5x300

R=5x300

G=4x300

B=7x300

Instruments:

Telescope: Skywatcher Esprit 120mm f/7

CCD: ST-8300M

CCD Guiding: Lodestar

Capture and guiding software: MaxIm DL

Mount: EQ-6 Pro

Processing: PixInsight

Bias, Darks and Flats applyed

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

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
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape
Artificial satellite

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
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	...
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M 23: An Open Cluster that Stands Out in Sagittarius

M 23: An Open Cluster that Stands Out in Sagittarius

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M 23: An Open Cluster that Stands Out in Sagittarius

M 23: An Open Cluster that Stands Out in Sagittarius

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