Contact information

Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Orion and Barnardin arc - 5.12.2021 at 00.00 Kokemäki Observation number 103104

Visibility V / V

Tomi Kurri, Porin Karhunvartijat

Together with the Bear Guards of Pori, we headed to the shores of Lake Sääksjärvi to spend the association's annual Arcturus observation weekend. The weather was favorable and the SLR shook through the night.

One of the subjects was the constellation Orion. In a dark place, the arc of Barnard is well visible in this total exposure of less than an hour. The picture also shows the familiar Orion's Mist and the Horse's Mist.



More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • Orion ja Barnardin kaari
  • Constellation
    • Orion
  • Nebulae
    • Emission nebula info

      In an emission nebula the hot stars nearby cause the gas glow. This should not mix with reflection nebula, where the gas is only lit up by nearby stars.

      The appearance of a gas nebula is irregular, and the fainter parts of it need bigger instruments to be visible.

       

      Emssion nebulae in Cepheus. The bigger part is composed of the nebulae Cederblad 214 (Ced214) and NGC 7822. The lower round nebula is called Sharpless 170 (Sh2-170). Image J-P Metsävainio.

       

      The Orion nebula. Image Samuli Vuorinen.

       

      In this 4-degree-field there are emission nebulae Sh2-157, Sh2-158, Sh2-159, Sh2-161 and Sh2-162 (or NGC 7635 aka Bubble Nebula) and open clusters M52 and NGC 7510. Image Juha Kepsu.

       

      NGC 281 aka Pacman Nebula. The object is in Cassiopeia. Image J-P Metsävainio.

       

      NGC 896 in Cassiopeia is the tip of Heart Nebula (IC 1805). Image Timo Inkinen.

    • Reflection nebula info

      Reflection nebula is gas only lit up by nearby stars. It should not be mix up with emission nebula, where hot stars nearby cause the gas glow. But then reflection nebulae are visible in the same areas with emission nebulae. The appearance of reflection nebulae is irregular, and many of them need bigger instruments to be visible.

       

      Reflection nebulae are glowing blue around the stars of Pleyades. Image Juha Parvio.

       

      The blue glowing reflection nebula NGC 1333 around the bright star is in Perseus. Image Timo Inkinen.

       

      The bluish reflection nebula NGC 2023 is located lower left from the Horsehead Nebula. The Horsehead Nebula itself is a dark nebula in the front of red emission nebula IC 434. In the left side there is NGC 2024 aka Flame Nebula. Image Samuli Vuorinen.

       

      NGC 7538 in Cepheus is a combination of reflection and emission nebula. Image Timo Inkinen.

       

      Rflection nebulae (LBN 550, 552 and 555) and dark nebulae (LDN 1228) in Cepheus. Image Juha Kepsu.

       

      Reclection nebula vdB 141 in Cepheus. Image Tero Turunen.

    • Dark nebula info

      Dark nebulae are dust in space. It obsruct the visibility of background star and bright nebulae. Thus, the dark nebulae are seen as dark clouds in space.

       

      The Horsehead Nebula is a dark nebula. Image Arto Murtovaara.

       

      The dark nebula LDN 1235 in Cepheus. Image Juha Kepsu.

       

      The dark nebula LDN 1302. Image Tero Turunen.

       

      The NGC 1333 is a reflection nebula, which includes also dark nebulae. Image Samuli Vuorinen.

Technical information

Canon 6D (astro-mod), Samyang 135mm, Astronomical CLS, Star Adventurer. Exposure time 55x1min. Image processing Pixinsight.

Comments: 2 pcs
Pekka Parviainen - 1.1.2022 at 17.26 Report this

Hyvin puristettu kiehkura, joka niin usein on kaikenlaisen ilmakehähyhmän turmelema.

Tomi Kurri - 2.1.2022 at 10.12 Report this

Kiitos Pekka! Tämän esiin kaivamiseen auttoi huimasti hyvä keli ja pimeä taivas. 

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