Observing during the Deep sky -meeting 2014, part 2

Date: 20./21.9.2014
Time: 22:00-02:00
Observing site: Tähtikallio observatory, Finland
Instrument: C416/4064mm (16” Meade)

NELM: 6.0
SQM: 21.10-21.00
Darkness of the background sky: 2-3
Seeing: 2
Transparency: 3
Weather: A little bit hazy sky, calm, warm, humid air

Objects observed: NGC 6781, IC 342, Messier 33 & NGC 604

During the second night of the event, observing conditions weren’t optimal, but I was able to make more observations. During the night, I observed NGC 6781, IC 342 and Messier 33 & NGC 604.

NGC 6781

NGC 6781 observed with 16'' Catadioptric.
NGC 6781 observed with 16” Catadioptric.

NGC 6781 is a relatively large planetary nebula in the constellation of Aquila, The Eagle. Here are my notes of my observation:

@97x: The object appears as a oval -shaped, faint nebula with a hint of a ring -structure with averted vision.

@ 97x+OIII: The ring -structure is obvious, best visible with averted vision though. There seems to be a faint star in the western edge of the nebula.

@ 239x: The object is an oval -shaped, pretty faint nebula with a clear ring -structure. The long axis of the nebula is oriented in N -S direction. No central star was visible, reminds me of the famous Ring nebula of Lyra, Messier 57.

IC 342

IC 342 is a really faint, face-on galaxy in the constellation of Camelopardalis, The Giraffe. The galaxy is a spiral galaxy of type Sc, which means, it has very loose and open spiral structure, and thus it also has very low surface brightness. This object requires absolutely ideal observing conditions to be visible properly. During my observing session, the observing conditions were far from being optimal, and thus the object wasn’t visible as well as it could have been.

IC 342 observed with 16'' Catadioptric.
IC 342 observed with 16” Catadioptric.

But anyway, here are my notes about the object:

@ 97x: Only the core of the galaxy and an area surrounding the core is barely visible with averted vision. The galaxy appears as a very faint, fuzzy, nebulous spot without any clear shape. No hope of seeing the spiral arms in these conditions. I ought to try to observe this one again when the transparency is better.

Messier 33 & NGC 604

NGC 604 is an extremely large HII area in the Triangulum galaxy, located in the constellation of Triangulum. This HII area is much larger than The Tarantula nebula located in the Large Magellanic Cloud, the largest HII area close to us. And thus it is also much larger than for example the famous Orion nebula, which is well visible in the winter sky.

NGC 604 observed with 16'' Catadioptric.
NGC 604 observed with 16” Catadioptric.

Here are my notes of my observation:

@97x: An extragalactic HII -area in The Triangulum galaxy. This object was visible as a bright, nebulous patch elongated in NW-SE -direction. The object is easy to see, it’s even easier than the core of it’s host galaxy! The object is located in the tip of one spiral arm about 13′ NE from the center of the galaxy.


2 thoughts on “Observing during the Deep sky -meeting 2014, part 2

  1. FlyTrapMan October 2, 2014 / 23:53

    Nice detail with NGC 604. The arms are well defined. I can imagine it was quite the sight to see through the eyepiece, especially with a 16” catadioptric. It’s neat you were able to observe an H II region in the Triangulum Galaxy — strange that it’s more apparent than the core.

  2. Juha Ojanperä October 3, 2014 / 22:36

    Thanks for commenting, FlyTrapMan! The HII area is much more smaller than the core of it’s host galaxy, and that’s why it’s light is much more condensed, whereas the light of the core of the galaxy is scattered to much more larger area, and thus it’s surface brightness is much more smaller. This one was indeed a really interesting object to observe!

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