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Ursa Astronomical Association
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Ursa Astronomical Association

SH2-101 - 17.9.2018 at 02.00 Fregenal de la Sierra, Espanja Observation number 77886

Visibility III / V

Tapio Lahtinen, Tampereen Ursa

About 6,000 light-years away is this emission mist, nicknamed Tulip Mist.
The subject is quite beautiful, very red and in many pictures resembles a nickname.

However, I was actually more interested in a ‘nearby’ object that can be said to belong to the history of astronomy.
Namely, in the 1960s, a powerful X-ray source was discovered in the area, and subsequent studies have found the object most likely to be a black hole - called Cygnus X-1 .
(This subject was once so inspiring that the Canadian progressive rock band Rush made it a song).

Around the black hole is believed to be an accumulation disc and showers coming from the poles.
One of these jets collides with interstellar matter and an arc forms on the shock wavefront, which is faintly visible in the image.

More similar observations
Additional information
  • Observation target
    • Deep space object
  • Designation
    • SH2-101
    • Keskitaso
  • Constellation
    • Cygnus
  • 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.

Technical information

Sky-Watcher Esprit 100ED, 10 Micron GM 1000 HPS, Atik 460EX, 440min Ha, OIII

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