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Category : Ciel profond

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 : Orion Starshoot Autoguider on a William Optic Zenithstar 66SD refractor.
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 : Orion Starshoot Autoguider on a William Optic Zenithstar 66SD refractor.
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 and the Elephant's Trunk Nebula

IC 1396 and the Elephant’s Trunk Nebula

This is a fairly well known HII region in Cephea, an ionized hydrogen region. IC 1396 designates an open star cluster consisting of a few bright stars in the center of the large red nebula. The Elephant Trunk is a dark area in the nebula at the center and a little to the left of the image that vaguely resembles the pachyderm member. His official number is IC 1396A.

Finally, my Nikon Z6 is operational on the deep sky imagery. I removed his IR-Cut filter that allows the adjustment of the white balance for “normal” photos. This unfiltering gave me a hard time. It has two filters: a blue-green one that filters the infrared and a good part of visible red including the wavelength of ionized hydrogen H-Alpha, and a dust filter. Once these filters removed, I end up with a big internal light input on the sensor. I had to decide for a partial unfiltering by putting back the dust filter. Fortunately the disassembly of the camera and relatively easy.

In term of sensitivity, I’m not disappointed. The exposure time speaks for itself since I did poses of 1 minutes whereas it would have taken poses of 10 minutes with my old Canon EOS 1000D. The more we do poses, the more we reduce the noise. So I made 80 and it took only half of the night!

80 exposures of 1 minute
Camera : Nikon Z6 partially unfiltered

Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : Orion Starshoot Autoguider on a William Optic Zenithstar 66SD refractor.
Temperature : 10°C
Humidity : 80% to 84%
SQM : 21.6
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : 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 […]