M39 (Chris Gifford)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: B363 · HD203245 · HD203284 · HD203340 · HD203416 · HD203418 · HD203577 · HD203644 · HD203938 · HD203989 · HD204002 · HD204023 · HD204131 · HD204411 · HD204906 · HD204917 · HD205059 · HD205073 · HD205085 · HD205101 · HD205116 · HD205117 · HD205198 · HD205210 · HD205331 · HD206121 · HD206312 · HD206523 · HD206601 · HD206731 · And 27 more.

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M39

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M39

Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, positioned two degrees to the south of the star Pi Cygni and around 9° east-northeast of Deneb. The cluster was discovered by Guillaume Le Gentil in 1749, then Charles Messier added it to his catalogue in 1764. When observed in a small telescope at low power the cluster shows around two dozen members but is best observed with binoculars. It has a total integrated magnitude (brightness) of 5.5 and spans an angular diameter of 29 arcminutes] – about the size of the full Moon. It is centered about 1,010 light-years (311 parsecs) away.

This cluster has an estimated mass of 232 M☉ and a linear tidal radius of 8.6±1.8 pc. Of the 15 brightest components, six form binary star systems; one more is suspected. HD 205117 is a probable eclipsing binary system with a period of 113.2 days that varies by 0.051 in visual magnitude. Both members seem to be subgiants. Within are at least five chemically peculiar stars and ten suspected short-period variable stars.

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Open Clusters

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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

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	Advanced success
Started	...
Astrometry.net job	6336696
PixInsight job	Y6MUKJCZCIVAA492LALIPPCR3NZT21BF
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h31m51s.12
RA (top/left)	21h46m00s.00
RA (top/right)	21h17m40s.00
RA (bottom/right)	21h18m33s.51
RA (bottom/left)	21h45m15s.82

Dec (center)	+48°24′24″.5
Dec (top/left)	+49°53′19″.7
Dec (top/right)	+49°51′57″.4
Dec (bottom/right)	+46°49′23″.5
Dec (bottom/left)	+46°50′25″.9

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M39

M39

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M39

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