Swansea Astronomical Society Blog

Saturday, December 4, 2010

 

The DARK, a short story that might do some good

I have written a short story that might help astronomers.
It is a work of fiction that may be read, downloaded and distributed freely.
The image below gives a clue:

Read or download the story HERE
Steve Wainwright

 

The Bubble Nebula in narrowband light

The Bubble Nebula, Caldwell 11 was imaged in narrowband H-alpha light using an Atik 314L camera on an 8", f/5 Newtonian:





It was also imaged with a combination of RED, GREEN, BLUE, UNFILTERED, H-alpha and Olll ( LRGBHAO3) filters to produce this image:




Nikki Mackin

Friday, December 3, 2010

 

Jupiter and a webcam experiment

I used a Skymax 127, 5", f/10 Maksutov with an SPC900NC webcam and a 2.5x Barlow to capture this image in relatively poor seeing conditions:


Add Image

The missing belt is faintly visible.

Changing scope to a 130mm, f/5 Newtonian, I used the Astrovideo software to experiment with off-chip integration and this unmodified webcam that can not take long exposures on the trapezium area of the Orion Nebula.

I captured a dark-frame that was the sum of 600 frames and then set Astrovideo to capture and sum on the fly, 40 darkframe corrected images, each of which was the sum of 600 frames:

This is what the camera could see from the preview screen:



This is what the grand sum of the 24000 frames looked like before processing:


This is the image after processing to bring out the information
Effectively a 'long' exposure was synthesised by summing many short exposures.
When this technology is used in combination with frame-integrating or true 'long' exposure cameras, substantial amounts of detail can be captured.

Steve Wainwright

 

Jupiter's re-awakening SEB

Jupiter was imaged with a DBK21AS camera, an 11" SCT and a x2 Barlow:
Jupiter

It looks as though there may be some re-awakening in the missing belt.
Keith Davies

Thursday, December 2, 2010

 

First attempt at narrowband imaging

An Atik 314L camera was fitted with extreme narrowband filters and two deep sky objects were imaged, the Crab and the Horsehead Nebulae.
The telescope used was an autoguided, f/5, 8" Newtonian. The filters were H-alpha and O-lll imaging in the red (656.3nm) and blue-green (500.7nm) respectively.
False colour images were produced to show the regions of nebulosity dominated by H-alpha and O-lll emissions. The H-alpha was used as the red channel and the O-lll was used as both the green and blue channels.
Click on an image to see a larger view.
M1


The Horsehead Nebula


Nikki Mackin

 

Aurora Borealis from Iceland

A week long expedition to Iceland with two trips out into the National Park, a 30-40 minute drive from Reykjavik at night to see the Northern lights yielded some results. A Canon EOS 1000D DSLR was used to capture 30s exposures of the night sky while aurorae were taking place:

Click on an image to get a larger view.






Gaynor Thomas

Tuesday, November 30, 2010

 

Jupiter

A DBK21 camera with a 1.5x Barlow was used with an 11" SCT
Jupiter

Keith Davies

Monday, November 29, 2010

 

An SDC-435 with a focally reduced 6" Newtonian

A Samsung SDC-435 was fitted with a short nosepiece, a light=pollution filter and a focal reducer was fitted on an autoguided 6" Newtonian.
M31

M97 The Owl Nebula

M42/43


Steve Wainwright

Sunday, November 28, 2010

 

Nebulae and galaxies with an SDC-435, and an autoguided, f/4.8, focally reduced, 10" Newtonian

A modified Samsung SDC-435 camera fitted with a short nosepiece, a light-pollution filter and a focal reducer was used with a 10", autoguided Newtonian. DVD was captured and BMPs were extracted from the DVD the Vob Frame Extractor. Dark-frames were scaled with Andrew Sprott's Dark-Frame Scaler:

Click on an image to get a larger view

Caldwell 11, The Bubble Nebula


Caldwell 27, The Crescent Nebula

Running Man Nebula NGC 1977


M81


M82

Steve Wainwright

 

First Saturn of the year

Saturn was imaged early this morning through an 11" SCT with a 2.5x Barlow and a DBK21 camera:

The rings are starting to open up again.
Keith Davies

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