Swansea Astronomical Society Blog

Saturday, March 8, 2014

 

Star party on Friday March 7th at Swansea Airport

The skies were clear enough to do some observing of the Moon, Jupiter and the Orion nebula. There was a good turnout with about 70 visitors. A number of youngsters came with their parents. Talks were given in the airport buildings and the cafe did a brisk trade:






Colin Miles
 

53% waxing, gibbous Moon

A Fujifilm Finepix S8200 Bridge camera was set to ISO 100, f/6.5 at 1/250s exposure and mounted on a Merlin, auto-tracking mount. The camera was set to its maximum of 40x zoom. Five sets of 10 images were captured in rapid succession in burst mode. The best 40 images were stacked in Registax 6 to produce the final image. Click on the image to get a larger view:


Steve Wainwright
 

Diminishing sunspots

A Fujifilm Finepix S8200 Bridge camera, set in B/W mode, was fitted with a Baader solar filter, set to ISO 100, f/6.5 at 1/1000s exposure and mounted on a fixed tripod. The camera was set to its maximum of 40x zoom. Ten images of the Sun were captured in burst mode and then registered in Registax. Click on the image to get a larger view:


Even though sunspots are sparse, faculae are still prominent near to the limb.

Steve Wainwright

Friday, March 7, 2014

 

A Quiet Sun in H-alpha light

A DMK21AS camera was placed at the prime focus of a Solarmax ll 60, BF15 H-alpha scope. About 2600 frames were stacked in Registax 5, from AVIs captured of four overlapping quadrants of the solar disk. The four resulting images were merged into a single mosaic image. The final image was colourised. Click on the image to get a larger view:


There are a number of bright, active regions and filaments on the relatively inactive chromosphere.
A Pentax Kx DSLR was fitted with a x 2.5 Barlow lens and 27 RAW images were captured at 0.25s exposure at ISO 200. The images were stacked in Registax 5. Click on the image to get a larger view:


The dynamic range was high enough to show prominences as well as details on the disk.

Steve Wainwright
 

Sparse sunspots with some faculae

A Fujifilm Finepix S8200 Bridge camera, set in B/W mode, was fitted with a Baader solar filter, set to ISO 100, f/6.5 at 1/1000s exposure and mounted on a fixed tripod. The camera was set to its maximum of 40x zoom. Two sets of 10 images were captured in rapid succession in burst mode. The images were stacked in Registax 6. Click on the image to get a larger view:



The Sun has low activity today. Sparse sunspots and faculae close to the limb are visible.

Steve Wainwright

Monday, March 3, 2014

 

Sunspots and an 8% waxing, crescent Moon

A Fujifilm Finepix S8200 Bridge camera, set in B/W mode, was fitted with a Baader solar filter, set to ISO 100, f/6.5 at 1/800s exposure and mounted on a fixed tripod. The camera was set to its maximum of 40x zoom. Two sets of 10 images were captured in rapid succession in burst mode.
Then another two sets of 10 images were captured at 1/1000s exposure. The Four sets of images were stacked in Registax 5 to produce the final image. The image shows many sunspots on the disk and some faculae. Click on an image to get a larger view:



Later in the evening, the tripod mounted camera was set to ISO 100, f/6.5 and 1/50s exposure. Ten images were captured of the 8% crescent Moon in burst mode and stacked in Registax:



The camera was set to High Dynamic Range mode and an HDR image of the Moon was captured. The camera takes three images with very different exposures and combines them into a single image:


The earthshine was captured by this method, whilst the illuminated part was overexposed.

The tripod mounted camera was set to ISO 12800, f/3.2 and 8s exposure. An image was captured containing the major constellations of Gemini, Orion and Taurus:


The original image had a large gradient due to light pollution and substantial chromatic noise:


This kind of gradient and noise can be easily removed by duplicating the image, doing a severe dust and scratches removal removes the star data, and subtracting the result from the original image produces the corrected image. Below is the above image with the data removed:



Steve Wainwright

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