Saturday, May 17, 2025

Rising and setting over the mountain ridges

 There was a large cloud looming over Bristol Head Friday night as Jupiter sank toward the mountain ridge.

Jupiter setting over the Bristol Head ridgeline.

 The four Galilean moons are visible in the original image.  Here is a close crop magnified by 3:

credit: SkySafariAstronomy.com

The lens used here, and in the following images, was a Vivitar Series 1 135mm f/2.3 with a Minolta mount, attached via adapter to a Sony A7iii camera.  This lens was first marketed in 1975.  At that time, 50 years ago, the Series 1 lenses were considered to be top-tier.  They are still pretty good, but fall short of modern designs that utilize newer glass types and aspherical surfaces. 

After twilight faded the clouds disappeared and the sky was nicely dark at sqml=21.53. There was some green airglow visible in the long exposure (30 s) images.

 

Capella (R) and Menkalinan (Beta Aurigae) setting over Bristol Head. Softon filter.

The constellation Corvus.  Softon filter.

When the distinctive quadrilateral asterism of Corvus has passed the meridian it is time to look near the southern horizon for Omega Centauri:

 

Omega Centauri (below center).  Centaurus A near top center.

Antares and Scorpius rising above the flank of Snowshoe Mountain. Softon filter.

Pollux (L) and Castor (R) setting over Bristol Head.  Softon filter.


Vivitar Series 1 135mm mounted on Sony A7iii

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