M 39 (Alberto Tomatis)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: M 39 · NGC 7092

M 39

M39 già è visibile ad occhio nudo nelle notti discretamente limpide: si mostra come una macchia chiara nella parte nord-orientale della costellazione,

verso il confine con le adiacenti Cefeo e Lucertola; un binocolo 7x30 è sufficiente per risolverlo in massima parte, consentendo di individuare una ventina

di stelle e il suo caratteristico aspetto triangolare, mentre un 10x50 già le mostra ben separate e nette, mostrando anche alcune coppie.

si trova ad una distanza di circa 825 anni luce dalla Terra, con una età stimata fra i 230 e i 300 milioni di anni;

il suo diametro è di circa 7 anni luce e contiene almeno 30 membri più luminosi dell'undicesima magnitudine.

Le 12 stelle più brillanti sono tutte di tipo A e B, sparse per un campo di oltre 30', mentre le stelle superiori alla nona magnitudine sono una ventina.

La stella più brillante dell'ammasso è nota con la sigla HD 205331; si tratta di una stella bianca di tipo spettrale A0,

con una magnitudine apparente di 6,83, e costituisce il bordo sudorientale dell'ammasso.

Please note: The following tables are updated every 24 hours.

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

AstroBin

AstroBin

Image Index:

Contribution Index (beta):

M 39

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

		...
You have no new notifications.

AstroBin

AstroBin

Image Index:

Contribution Index (beta):

M 39

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Error

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information