LDN 1251 (mario_hebert)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

Image of the day 08/03/2019

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LDN 1251

Image of the day 08/03/2019

Powered byPixInsight

LDN 1251

Quatorze heures d'exposition au total pour cette belle nébuleuse sombre qui répond au nom de LDN 1251.

Commencée le mois dernier, il m'a bien fallu mettre quatre ou cinq autres nuits pour aller chercher du data supplémentaire sur ce beau nuage.

Des nuits parfois bien écourtées par le lever de la lune, ou bien par de la fumée des feux de forêt, ou par ci et par ça....

Mais bon, à ramasser quelques heures d'exposition ici et là, on finit par s'en tirer avec un total quand même potable.

Avantage supplémentaire: ça donne une pratique du tonnerre pour bien recadrer le même objet d'une nuit à l'autre, même rotation de camera, même centre de photo, et cela en mode nomade!

Alors voilà le résultat.

Normalement je suis plutôt un grand "consommateur" de galaxies, mais je dois avouer que les nébuleuses sombres sont quand même fascinantes à regarder et à photographier.

De voir diminuer le bruit qui les accompagne au fur et à mesure que s'accumulent les heures d'exposition, ça a un petit côté bien satisfaisant!

Sans compter que, savoir qu'on va "déranger" dans leur tranquillité ces masses absolument gigantesques de poussières et de gaz bien plus grandes que notre système solaire qui dorment à des centaines d'années-lumière d'ici, au au plus profond de la constellation de Céphée, eh bien... j'aime! :-)

44 X 900 secondes Luminance bin 1X1

13 X 240 secondes Rouge bin 2X2

13 X 240 secondes Vert bin 2X2

13 X 240 secondes Bleu bin 2X2

Total LRGB = 14 hres

Télescope Newton Skywatcher Quattro 10" CF à 1000 de focale (F4)

Monture Takahashi EM-200 Temma2

Camera monochrome QHY9 refroidie à -20C

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

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	...
Astrometry.net job	2825660
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

Image of the day 08/03/2019

LDN 1251

Image of the day 08/03/2019

LDN 1251

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Image Index:

Contribution Index (beta):

Image of the day 08/03/2019

LDN 1251

Image of the day 08/03/2019

LDN 1251

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Sky plot

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