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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

M42, IC 434, Barnard 33 - 16.2.2016 at 21.40 - 16.2.2016 at 22.00 Järvenpää Observation number 49088

Visibility IV / V

Toni Veikkolainen, Keski-Uudenmaan Altair

In addition to photographing the northern lights , I had decided to do a test run of my H-alpha filter. Indeed, the conditions were so bad that narrowband imaging was the most sensible form of imaging. On the other hand, even it didn’t save me from the gradients I had to remove in image processing. For a very long time I didn’t shine this time, but the fogs of Orion still came out moderately. During the shooting of the series, the northern lights were visible in some places even quite bright in the northern sky, but the only camera that was included was busy.

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Additional information
  • Observation target
    • Deep space object
  • Designation
    • M42, IC 434, Barnard 33
    • Näyttävä
  • Constellation
    • Orion
  • Weather
    • Selkeää, pikkupakkasta, 67 % kuu 40° korkeudella, revontulia pohjoisessa.
  • Darkness
    • Bad
  • Seeing
    • Good
  • Nebulae
    • 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.

    • 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.

    • 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.

Technical information

Canon EOS 600D mod + Samyang 85mm f / 1.4 + Baader Hα filter, total exposure 20 min, as tracking device Astrotrac TT-320X

Comments: 2 pcs
Tapio Lahtinen - 23.2.2016 at 12.06 Report this

Baaderilla ei taida olla clip-filttereitä, eli miten olet Baaderin filtterin saanut kuvausjunaan ?

Toni Veikkolainen - 23.2.2016 at 13.02 Report this

Filtteri on sulkimen ja obiskan+adapterin välissä ja alunperin leikattu Baaderin 2" okulaarifiltteristä sopivan kokoiseksi. Samyangini on itseasiassa Nikon-bajonetilla, joten käytän sitä adapterin kanssa. Toisaalta adapteri tuo juuri sen verran välimatkaa, että filtteri mahtuu sulkimen eteen sujuvasti eikä ota kontaktia obiskan takaosaan.

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