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Winter Sky from Mellifont Abbey PDF Print E-mail
Written by Dave Grennan   
Monday, 07 March 2016 23:27

Winter Sky from Mellifont Abbey (Click for Full Sized Image)

Credit: Carl O'Beirnes

Old Mellifont Abbey was founded in 1142 by Cistercian monks lies on the Meath/Louth border close to the town of Drogheda.  It was a center of learning and teaching until the suppression of the monasteries by King Henry VIII in 1539. Today much of the ruins remain and are captured here set against the background of the winter constellations of Orion and Taurus.  Clearly visible in this shot is the 'Great Orion Nebula' and the lovely 'Pleiades' star cluster. This single image shot was taken with a Canon Mark5D camera and a Sigma 24mm f/1.4 lens.  Processing was done in Adobe Photoshop and LightRoom and represents Carl's first effort at landscape / night sky composition.

Last Updated on Monday, 07 March 2016 23:36
 
Hubble Deep Field from Raheny PDF Print E-mail
Written by Dave Grennan   
Friday, 24 April 2015 21:55

(Click for Full Size Image)

25 years ago today, saw the launch of one of mankinds greatest achievments.  The Hubble Space Telescope launched from Cape Canaveral carrying the hopes and dreams of astronomers across the world.  Despite early setbacks Hubble has provided us with some of the most amazing and awe inspiring views of the cosmos.  Probably one of the most profoundly significant images ever taken is the Hubble Deep Field (HDF).  On the 18th December 1995, Hubble peered at a tiny patch of apparently almost empty sky near the 'Plough' or 'Big Dipper'.

 

Last Updated on Monday, 07 March 2016 23:31
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New Telescope for Raheny PDF Print E-mail
Written by Dave Grennan   
Friday, 12 July 2013 20:20

Since last December, a new telescope for Raheny Observatory has been under construction.  Much of that time was taken grinding and polishing the main mirror.  A 14" f/3.85 precision optic which will deliver crisp a clear wide views of the night sky.  Much of the survey work done at Raheny involves covering as much sky as possible in a clear sky window.  This telescope, when complete will enable me to cover significantly more in an evenings work and hopefully increase the number of discoveries made by me ar Raheny.  A major milestone was reached this week when the main mirror returned to Raheny after making a visit to a specialist coating plant to have it's reflective coating deposited.

The following is a detailed article discussing the grinding and polishing and figuring of the mirror.

Grinding_a_14inch_mirror.pdf

 

Last Updated on Friday, 12 July 2013 20:40
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3rd Supernova Discovery at Raheny PDF Print E-mail
Written by Dave Grennan   
Sunday, 27 April 2014 11:14

Supernova 2014as (Discovery Image - Click for full sized image - Supernova marked with red lines)

I'm delighted to be able to announce my third discovery of an extragalactic supernova.  This particular exploding star was discovered in the galaxy NGC5410 late of April 18th.

Last Updated on Friday, 24 April 2015 22:20
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Jupiter image from Balbriggan. PDF Print E-mail
Written by Dave Grennan   
Sunday, 16 December 2012 21:31

Carl O'Beirnes sent this wonderful image of Jupiter taken Friday 14th December.

(Click for larger image)

Carl Says - "The processing on this image was done differently. First of all each image was loaded into autostakkert and processed. All the sharping was done in Registax v6. Once all the images are sharpened each set of Reds Greens and Blues where analysed and de-rotated in Winjupos.  Final processing was done in Adobe Photoshop.

The images where captured using a C14 OTA on an AP1200 mount. Lumenera Skynyx 2.0m CCD camera, Astronomik RGB filters and a 2X Barlow."

 

All in all I think this is a really exceptional image.  Note the swan like feature in the centre of the image.

Last Updated on Sunday, 16 December 2012 21:59
 
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