Sunday, September 09, 2018

chose NGC 6820 (Blue Mountains)

After a long delay, I finally imaged a deep sky object using Phil's rig. NGC 6820 in Vulpecula, aka Sh 2-86 or LBN 135, in a busy star field. SkyTools describes it has a diffuse nebula.

In the centre of the nebula there's a small open cluster, NGC 6823.

diffuse nebula NGC 6820 in one-shot colour

Tele Vue NP 101 refractor, Losmandy GM-8 with Gemini mount on pier, FeatherTouch electronic focuser, StarryNight, FocusLynx Commander. Guided through a Tele Vue 70 Ranger with Orion SSAG and PHD2. Canon 40D, Backyard EOS. 12x150sec, ISO 1600, daylight white balance. Dark frames applied. Canon DPP, Deep Sky Stacker, Adobe Photoshop. North is top-right; east is top-left.

There are some multi-star systems within the NGC 6823 cluster.

The three bright, beige stars in the centre I believe are HD 344784 or J 490. This is a different presentation than in the SkyTools 3 Pro chart.

A bit to the right or north-west I can see a very tight pair of dim stars. Part of the triple POU 4021.

There is a triangular grouping of stars. to the right or north-west. This harbours some multi-star systems.

The brightest system is at the upper right. This is HR 7485 aka Σ2560. A is bright white. B is tangled in the glare of A. C is above or north-east, pale orange.

There's HD 185820 aka POU 4004 is visible. The bottom point of the triangle is clearly two stars. The system is actually a quadruple but only the A and C stars resolve. Both pale yellow.

Further to the north-west is the tiny, tight pair of POU 4000 A and B. A is slightly orange; B is pale yellow.

The weird orange comet-looking fan-shape is Collinder 404, I believe. A tiny open cluster.


I'm happy that something showed. Hints of red, I'm thrilled to see. I think there are hints of pillars!

Hopefully as I get better at post-processing I can draw out more detail.

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