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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

LBN691 - 29.3.2019 at 20.10 Hyvinkää Observation number 81989

Visibility I / V

Timo Inkinen, Ursa (Etelä-Suomi)

Here, for a change and a warning, an object that shouldn’t be described, at least because of its appearance, because this is such a non-existent dim fog from the sky. So the picture is about a molecular cloud cataloged LBN691 and this can be found a few degrees from the M81 galaxy in the Big Bear. Here’s a larger image of that area, and my own image area is a slightly brighter fog area visible in the middle of that image. In this wide angle view, the LBN691 is shown in the upper right at 2 o'clock.

The picture shows a total exposure of 13h 12min with a 6 "lens tube.

After the fire described, there is not the slightest desire to return to this destination again ;-)

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • LBN691
    • Erittäin heikosti näkyvä
  • Constellation
    • Ursa Major
  • Field of view
  • 1.2 degrees
  • Darkness
    • Average
  • Seeing
    • Good
  • Limiting magnitude
    • 4.5
  • 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.

Technical information

Described with TMB 152/1200 Triplet APO lens tube (shortened to 900mm focal length). QSI 583ws CCD camera and oblique stack 5min (L) / 8min (RGB) single exposures: Lum 30x300s + 1x600s = 160min R 27x480s = 216min G 26x480s = 208min B 26x480s = 208min Total 792min = 13h 12min

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