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Old 05-08-2018, 08:11 AM
Tropo-Bob (Bob)
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Join Date: Sep 2013
Location: Cairns
Posts: 1,003
My observations

I viewed these last night. All of the five main stars were visible to the eye without difficulty.

I used my Orion 80mm Triplet (FL 480mm, on an AZ mount.) For EPs, I mainly used a 24mm Panoptic, a 10mm & 4 mm Radians, 15,7 & 5mm Delites & in one instance, a 35mm Parks Plossöl.


Objects of interest

NGC 6791. An Open Cluster. At 8 billion years old, it defies the norm by being metal rich.
This appeared as a slightly increased intensity of the Milky Way in this region. I would not have picked it to be an open cluster. It was shown best with the 35mm EP (14x).

Eta Lyr. A Showcase Double.
With 32x, a wide companion was seen. It is about 4 mags fainter than the main star. I expected it to be more spectacular!

Struve 2470 & 2474. Another Double-Double, however fainter & easier to split.
These are special and relatively easy to find being not far from Gamma Lyr.

At 32x, they appeared as twin doubles. Each double had the brighter star on the bottom and a fainter star above at an almost identical angles. The magnitudes of both primaries and their fainter secondaries also appeared to closely match each other. Its unusual and well worth viewing. (I had never seen these before and I am quite chuffed!)


R Lyrae. A variable, red star.
It looked deep orange to me. The star was visible to the eye.

RR Lyrae. This is the prototype of this type of variable stars.
Bright enough to be easily seen, but no colour was apparent.

I never thought I would see this famous star. It brought back memories of seeing Pluto in the sense that it was nothing special to the eye, but I was very pleased to have seen it.



The Main Stars

Alpha Lyrae (Lyr): Vega. 5th brightest star in the night sky.
Appeared Icy white in colour. No companion was seen.

Beta Lyre - Varies by 1.2 mags in 13 days. It is also a double star.
Appeared white. At 20x, a wide companion was visible. It was about 3 mags fainter than the primary.

Gamma Lyr: Sulafat. The 2nd brightest star in Lyra.
Sulafat appeared white.

Delta Lyr. An optical double.
The brighter star appeared to be medium orange in hue, where as the star appeared mainly white with a touch of blue. There was about a magnitude difference in brightness.

Epsilon Lyr. The Double-Double. (The standard test for telescopic performance on Double stars)
Both doubles were split with 95x, but were much easier to view with 120x. All four stars appeared white.
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