Crescent nebula (Alan Ćatović)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888

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Crescent nebula

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Crescent nebula

Lokacija: Stup, Sarajevo

Oprema: SW APO 120mm f/7.5, FR FF 0.85x, NEQ 6 Pro, Canon 1100D mod by AG Sarajevo, QHY 5L-II, CLS CCD Clip filter

Softveri za vođenje: PHD

Vrijeme integracije: 7,5h

Obrada: Pixinsight, Photoshop

Maglina “Polumjesec” (NGC 6888, Caldwell 27, Sharpless 105) je emisiona maglina u sazviježđu Labud (Cygnus), udaljena 4500-5000 svj. godina od nas. Maglinu osvjetljava Wolf-Rayet-ova zvijezda WR 136 (HD 192163) koja svakih 10 000 godina izbaci materijala kao 10 masa Sunca. Nastala je kada se brzi zvjezdani vjetar (brzine oko 5 miliona km/h) ove zvijezde sudario sa nešto sporijim vjetrom koji je ranije izbacila (brzinom oko 32 000 km/h) ova zvijezda (u fazi crvenog diva, prije 250 000 do 400 000 godina).

Ova zvijezda se vidi kao svjetla tačka u centralnom dijelu magline.

Ishod sudara je kompleksna ljuska i dva udarna talasa. Jedan se kreće prema vani, a drugi prema unutra. Udarni val koji se kreće prema unutra zagrijava zvjezdani vjetar do temperatura pri kojim dolazi do emitovanja rendgenskog zračenja.

Objekat je vrlo taman i nalazi se oko 2 stepena udaljen od zvijezde Sadr. Većina teleskepa zahtjeva filtere (UHC ili OIII) da bi se maglina vidjela.

U slijedećih 100 000 do milion godina predviđa se da će ova zvijezda postati Supernova.

Neki ovu maglinu zovu i “Euro maglina“ jer njen oblik podsjeća na znak Euro.

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	3275477
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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