Heart Nebula a full frame 2x2 mosaic tale (Palmito)

Heart Nebula a full frame 2x2 mosaic tale

Link: https://www.elveteek.ch/en/ic1805

The nebula gets its red(*) color from the large amount of excited hydrogen gas (H-alpha). Nebulae are nurseries of stars, they are areas where stars are born.

Located in the Cassiopeia constellation at 7,500 light years away from us (about 75,000,000,000,000,000 km, 75 million billion km ?!), it is 100 light years in diameter.

It was discovered by William Herschel in 1787, a pioneer of astronomy. It is thanks to the telescopes he built that we were able to discover the richness of the universe around us, and that 100 years before the invention of photography!

The stellar cluster contains very young stars, super giant blue stars that are about 1.5 million years old (compared to 4.6 billion years for our sun). At the center, several very bright stars are nearly 50 times the mass of the sun.

* It should be noted that when we speak of red, we mean it in its natural colors. Here, an artistic choice has been made so that excited sulfur (SII) is red, excited hydrogen (H-alpha) is green, and excited oxygen is blue. This color palette allows for better differentiation of the different gases and was made popular by Hubble. Therefore, it is often called the Hubble palette.

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La nébuleuse tire son rouge(*) de la grande quantité de gaz d’hydrogène excité (H-alpha). Les nébuleuses sont des pouponnières d’étoiles, ce sont des zones où les étoiles naissent.

Située dans la constellation Cassiopée à 7'500 années lumières de nous (environ 75’000'000'000'000'000 km, 75 millions de milliards de km ?!), elle fait 100 années lumières de large.

Elle a été découverte par William Herschel en 1787, pionnier de l’astronomie. C’est grâce aux télescopes qu’il a construit qu’on a pu découvrir la richesse de l’univers qui nous entoure. Et cela 100 ans avant l’invention de la photo !

L’amas stellaire contient de très jeunes étoiles, super géantes bleues âgées d’environ 1.5 million d’années (contre 4.6 milliard d’années pour notre soleil). Au centre, plusieurs étoiles très brillantes font près de 50 fois la masse du soleil.

* Il est à noter que lorsque l'on parle de rouge on l'entend dans ses couleurs dites naturelles. Ici un choix artistique a été fait de façon à ce que le souffre excité (SII) soit rouge, l'hydrogène excité (H-alpha) vert et l'oxygène excité bleu. Cette palette de couleur permet de mieux distinguer les différents gas et a été rendue connue par Hubble. Ainsi elle est souvent appelée palette Hubble.

Original
C
D
F
Final
H

C

Description: Reprocessed

Uploaded: ...

D

Description: Fixed mosaic join issue

Uploaded: ...

F

Description: Fixed hot pixels in "OIII tile#2"
Reworked colors

Uploaded: ...

H

Description: Added true RGB stars and made them more visible, reworked color calibration

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7263721
PixInsight job	6S7YK2EIBIWOJLN9VN3EASTYM5PG8WCH
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h32m41s.347
RA (top/left)	02h41m54s.318
RA (top/right)	02h43m00s.811
RA (bottom/right)	02h22m23s.802
RA (bottom/left)	02h23m28s.696

Dec (center)	+61°27′39″.55
Dec (top/left)	+59°39′37″.68
Dec (top/right)	+63°13′06″.51
Dec (bottom/right)	+63°13′16″.77
Dec (bottom/left)	+59°39′37″.45

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