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Ursa Astronomical Association
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Ursa Astronomical Association

NGC 6842 - 8.11.2021 at 21.00 Imatra Observation number 102429

Visibility II / V

Rauno Päivinen, Etelä-Karjalan nova

The constellation of the fox has a planetary nebula NGC 6842 with a size of about 1 arc minute and 14 mag. I put together a HOO version of these with red H-alpha and blue and green OIII.

This is an planetary with an interesting shape and quite a lot of detail. The richly stretched negative shows a peculiar hazy part between 8 and 9 p.m., the peculiarity is that it seems to stand out more clearly in the OIII channel.

The first is the HOO version

Second OIII channel 30x600s, third OIII negative,

fourth H-alpha channel 24x600s, Fifth H-alpha negative

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • NGC 6842
  • Brightness in magnitudes
    • 14
  • Field of view
  • 22 arc minutes
  • Darkness
    • Mediocre
  • Seeing
    • Good
  • Nebulae
    • Planetary nebula info

      Planetary nebula is the remnant of a death star. It could be ring-shaped, disc-like or spread out rather irregularly.

      With the exception of some nearest objects planetary nebulae have a small apparent diameter and they need a rather big instrument to be visible.


      Planetary nebula M27 aka The Dumbbell Nebula in Vulpecula. Image Juha Parvio.


      M76 aka The Little Dumbbell Nebula in Perseus. Image Rauno Päivinen.

Technical information

Celestron C14 + Optec 0.5X reducer. Atik 460EX camera. Astrodon 5nm H-alpha and 3nm OIII filters.

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