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Category : Ciel profond

M31

M31

The girl next door,
The neighbor,
Great is beautiful.

Well especially in photos because, visually, it is rather a big blurry spot. I call it a big cosmic scam for newbies. The Andromeda Galaxy is the large galaxy located right next to ours just 2.5 million light years away. It is the most famous. It is the most distant object that you can see with the naked eye. So inevitably, the beginner in astronomy will quickly point his brand new telescope on it to see … a blurred spot! And then you’ll see him appear on the forums to ask if he’s pointed at the right place or if his telescope is out of order. No no, everything is normal, there’s just nothing more to see! In fact, it is better to observe him with a simple pair of binoculars.

For this photo the acquisitions were made on the night of Saturday October 17 to Sunday 18 under rather specific conditions. 0 ° C and 100% humidity. I was wondering if it’s that wet when it rains! Everything was soaked. I wiped the PC screen with kleenex. On the refractor I have a heating element to prevent due which did the job very well, to my astonishment. The Nikon Z6 refuses to recognize the fake battery that allows me to power it with a large 4S li-ion. Forcing to put the real battery on it, which necessarily limited the autonomy. At 4 a.m. it was covered with a good layer of frost. And finally, there is a flare. So I will have to redo it. Probably in 4 or 5 years, time to bring together the right conditions at the right time.

49 x 1 min
Camera : Nikon Z6 partially unfiltered
Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 0°C
Humidity : 100%
SQM : 21.55
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : L’Epine

Cygnus Lace

Cygnus Lace

For this one, I choose to translate the french title. In english it is better known as Cygnus Loop or Veil Nebula. I thing the french name is more poetic.

The remains of a star that exploded about ten thousand years ago. We call it a supernova remnant.

It’s a great summer classic. I never miss to go to observe it visually. It is a pleasure to stroll along the filaments, from the large lace (on the left) to the small (on the right) via the Volutes of Williamina Fleming. Sometimes when the sky is really good, I can perceive other weaker part.

60 x 1 min
Camera : Nikon Z6 partially unfiltered
Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 23°C
SQM : 21
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : Le Plan, Col du Banchet

America And The Pelican

America And The Pelican

Yes, they even have their nebula… I’m not telling you where the North America Nebula is or why we call it like that, it’s pretty obvious. It’s identified as NGC 7000. To its right is the Pelican Nebula, IC 5067 and IC 5070. The bird is a little harder to recognize.

These nebulae represent only part of the H-alpha complex found in the Cygnus. Ionized hydrogen is found in a large part of the constellation and even beyond.

90 x 1 min
Camera : Nikon Z6 partially unfiltered
Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 7°C
Humidity : 84%
SQM : 21.4
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : Le Serpaton, Gresse-en-Vercors

Rosette Nebula

Rosette Nebula

The Rosette Nebula, registred under the number Calwell 49, is an H-II region in the constellation Unicorn. As it is not a very well-known or easily identifiable constellation, so we start from Orion to locate it. It is east of Orion, in the extension of the line formed by Meissa (Lambda Orionis) and Betelgeuse. There are several entries from the NGC catalog:

  • NGC 2237: the western part
  • NGC 2238: another part of the nebula
  • NGC 2244 (= NGC 2239): the cluster open in the center
  • NGC 2246: another Rosette emission region

112 x 1 min
Camera : Nikon Z6 partially unfiltered
Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 2°C
Humidity : 68%
SQM : 21
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : Le Plan, Col du Banchet

IC 1805 - Heart Nebula

IC 1805 – Heart Nebula

Another typical nebula of late summer. The Heart Nebula is a region HII neighbor of the Soul Nebula. In the sky, it is located in Cassiopeia, at the end of the tip of Perseus. In the galaxy, she is in the arms of Perseus, 7500 light years from us.

93 x 1min
Camera : Nikon Z6 partially unfiltered
Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 12 to 10°C
Humidity : 70% to 84%
SQM : 21.6
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : L’Epine, Hautes-Alpes, France

NGC 1499 - California Nebula

NGC 1499 – California Nebula

Yet another HII region, in Perseus this time. An emission nebula, therefore, the famous ionized hydrogen. Its name comes from its resemblance to the American state. It is 70 light-years long and is 1500 light-years away from us, making it the closest HII region to the solar system.

It’s not an easy to catch object since its best period for photograph it is the rainy season, the autumn, the month of November or December. I did it on September 3rd from 2am and it was still low on the horizon. So I kept only 80 of the 100 exposures I made.

80 exposures of 1 minutes
Camera : Nikon Z6 partially unfiltered

Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 8°C
Humidity : 85% to 95%
SQM : 21.6
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : L’Epine, Hautes-Alpes, France

IC 1396 et La Nébuleuse de la Trompe d'Elephant

IC 1396 et La Nébuleuse de la Trompe d’Elephant

C’est une region HII assez connue dans Céphée, une region d’hydrogène ionisé. IC 1396 désigne un amas ouvert d’étoile composé des quelques étoiles brillantes au centre de la grande nébuleuse rouge. La Trompe d’Elephant est une zone sombre dans la nébuleuse au centre et un peu a gauche de l’image qui ressemble vaguement au membre du pachyderme. Son matricule officiel est IC 1396A.

Enfin, mon Nikon Z6 est opérationnel sur le ciel profond. Je lui ai retiré son filtre IR-Cut qui permet d’ajuster la balance des blancs pour de la photo “normal”. Ce défiltrage m’a donné du fils a retordre. Il a deux filtres : un bleu-vert qui filtre les infrarouges et une bonne partie du rouge visible dont la longueur d’onde de l’hydrogène ionisé H-Alpha et un filtre anti-poussière. Une fois ces filtres retiré, je me retrouve avec une grosse entrée de lumière interne sur la capteur. J’ai du me résoudre à un défiltrage partiel en remettant le filtre anti-poussière. Heureusement le démontage du boitier et relativement facile.

Côté sensibilité, je ne suis pas déçu. Le temps de pose de lui même puisque j’ai fait des pose de 1 minutes alors qu’il aurais fallu des poses de 10 minutes avec mon ancien Canon EOS 1000D. Plus on fait de poses plus on réduit le bruit. J’en ai donc fait 80 et ça n’a pris que la moitié de la nuit !

80 poses de 1 minutes
Nikon Z6 défiltré partiel

Lunette Takahashi FSQ-106ED.
Monture Takahashi EM-200 électronique fait maison.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Température : 10°C
Humidité : 80% à 84%
SQM : 21.6
Logiciels : auto-guidage avec PHD2, acquisitions avec Astro Photography Tool, traitement avec PixInsight.
Site : L’Epine, Hautes-Alpes, France

Galaxy Season is Open

I opened it on the weekend of March 29th to 31st with two sessions of astrophotography. The Whale and the Hockey were captured Friday night March 29 near the Banchet Pass north of Voiron. These are the NGC 4631 and NGC 4656 galaxies in the Canes Venatici constellation, about 30 million light-years apart. We also […]