Swansea Astronomical Society Blog

Saturday, May 4, 2013

 

Saturn

A Philips SPC900NC camera, fitted with a 2x Barlow was used with a 6", f/10 SCT to capture an AVI, using wxAstrocapture software. The AVI was stacked in Astrostakkert 2 and wavelet processed in Registax:


Colin Miles

Friday, May 3, 2013

 

A Card for the Chairman

At the Swansea Astronomical Society committee meeting last night, Brian Stokes, the Chairman was presented with a beautiful card made by the children at Cwmrhydyceirw Primary School.



The card was in appreciation of a visit made by Brian to the year 4 pupils to talk to them about astronomy.


The Card



Well done Brian and well done Cwmrhydyceirw Primary School Year 4 pupils and teachers.

Steve Wainwright

Thursday, May 2, 2013

 

Afocal Saturn

An afocal image was taken of Saturn through the 12" SCT at Fairwood common using a Casio compact camera:


Dave Evans and Colin Elphic
 

The Sun in H-alpha and Ca K-line light

An Opticstar PL-130M 1280 x 1024 monochrome CMOS camera was placed at the prime focus of a Solarmax ll 60 BF15, H-alpha scope and a Ca K-line PST scope. Two ND filters were stacked on the adapter for the H-alpha imaging. 6 min AVIs were captured at each wavelength of the full solar disk. The AVIs were stacked in Registax and the resulting images coloured Red for H-alpha and blue for Ca K-line:
H-alpha

Ca K-line

The two images were blended 50% each to show the structures revealed in both wavelengths. The image was coloured mauve

An animation of the three images shows them in turn

Anatomy of a sunspot in H-alpha light (AR1734)
A DMK21AS camera was used with the lens from a 2 x Barlow stacked with a 2.5 x Barlow. A 10,000 frame AVI was captured and stacked in Registax so that the minimum frame quality was 90%:


Steve Wainwright
 

A webcam Saturn through filters

A Philips SPC900NC camera was used with a 2x Barlow and a 6" SCT. Three AVIs were captured. The first was unfiltered. The second was using a yellow filter and the third was using a light-pollution filter. The AVIs were stacked in AutoStakkert 2 and wavelet processed in Registax.

Unfiltered

Yellow filter

Light-pollution filter

Colin Miles

Wednesday, May 1, 2013

 

The Sun in H-alpha light

An Opticstar PL-130M, monochrome, 1280 x 1024 CMOS camera was fitted with two ND13 filters to bring the light levels within the sensitivity range of the sensor. The camera has a 1/2" sensor, so, when placed at the prime focus of a Solarmax ll 60 BF15 H-alpha scope, the image of the entire disk falls on the chip. The camera was set to capture 5 minutes of AVI at 8fps. The data were stacked in Registax to produce the final image which has been colourised to represent the wavelength of light being used.


A DMK 21AS camera was placed at the prime focus of the Solarmax scope and 5000 frame AVIs were captured of 4 overlapping regions of the solar disk. The resulting images were stitched together to produce a single image:


The region of the solar disk containing the active regions AR 1732, AR1734 and AR1736 was imaged with a 2.5 x Barlow:


The region containing AR1731 was imaged and colourised:

























Afocal image of a prominence with a hand-held Fuji compact camera


Steve Wainwright
 

The Sun in Ca K-line light, Saturn and Jupiter April 30

A DMK21AS camera was fitted with a short adapter, a focal reducer and a Baader Ca K-line filter. This filter gives a relatively wide bandpass of 9nm centred on the Ca K-line. Overlapping areas of the Sun were imaged with 5000 frame AVIs using a Helios, 6", f/5 refractor fitted with a Baader photographic grade solar filter. (note, this filter is not a visual filter and additional stacked, neutral density filters were required to make it safe for centering the Sun). The resulting images were stitched into a single image:
The camera setup

Full disk image of the Sun in Ca K-line light

Without the focal reducer, details of AR1731, 1730 and 1735 were captured:



The seeing was not as good as the previous night. An 8" SCT was used with a DFK21AS camera to capture a 5,000 frame AVI at 15fps and 1/15s:


Jupiter was very low in the western sky with poor seeing and detail was not resolved:


Steve Wainwright

Tuesday, April 30, 2013

 

Saturn with a Philips webcam

A Philips SPC900 camera was used with a 6" SCT and a 2x  Barlow and an AVI was captured. 1502 frames were stacked first in AutoStakkert!2 then wavelet processed in Registax:


The Seeliger, opposition effect is still very evident.

Colin Miles

 

Saturn

A DFK21AU AS camera fitted with a 2.5 x Barlow was placed in the focuser of an f/10, 5" Maksutov. A 10,000 frame AVI was captured of Saturn and the 5000 best frames were stacked. This gave a 71 fold increase in the signal to noise ratio and allowed more detail to be revealed:



Steve Wainwright

Monday, April 29, 2013

 

The Sun and an 84% waning, gibbous Moon

A Pentax K-x DSLR was fitted with a 300mm lens and mounted on a fixed tripod. 20 RAW images at ISO 800 were captured in rapid succession and stacked in Registax 5 to produce the final image. Click on an image to get a larger view.


A DMK21AS camera was used with a focal reducer and a short adapter and a Solarmax ll 60 BF15 H-alpha scope to capture the whole disk. The image was colourised to represent the wavelength used:


During imaging, an interesting transit occurred:


The focal reducer was removed and four overlapping areas of the Sun were imaged and stitched together into a final image:


Steve Wainwright

Sunday, April 28, 2013

 

Saturn and the Seeliger effect

A Philips SPC900 camera was placed at the prime focus of an f/10, 6" SCT and an AVI captured of Saturn:


Using a 1.6  x Barlow, this image was obtained:


The Saturn was imaged using a 2 x Barlow:


The ring-brightening of the Seeliger or opposition-effect can clearly be seen.

Colin Miles
 

The Moon and stars with a DSLR, April 27

A tripod mounted Pentax K-x DSLR fitted with a 70mm lens was used to capture 9 x 30s RAW images of Casseopeia at ISO 12,800. The images were stacked in Deep Sky imager to produce the final image. Lines were animated into the image to show the main stars of the constellation:


At ISO 1600, using a 50mm lens, a 15 minute exposure of the sky around Polaris was made to produce star trails:


At ISO 400 and 1/500s, 16 exposures were made of the 88% waning, gibbous Moon and stacked as tiff files in Registax:


Steve Wainwright

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