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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 Friday, 24 April 2015 22:32
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
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
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.



Last Updated on Friday, 12 July 2013 20:40
Memories of Sir Patrick Moore. PDF Print E-mail
Written by Dave Grennan   
Monday, 10 December 2012 22:16

We learned with the deepest sadness of the passing of our friend and inspiration, Sir Patrick Moore CBE.   No doubt many will testify that Patrick inspired so many people's interest in astronomy.  In particular his show "The Sky at Night" became an institution not only in Britain but all over the world. On many occassions Patrick welcomed his Irish friends into his home.  His hospitality was as immense as his encyclopaedic knowledge of all things space related.  Patrick had a particular interest in the moon and his detailed maps were used by NASA during the Apollo preparations.

It is hard to imagine that this great man played piano with Albert Einstein, was close friends with the late Neil Armstrong and was always up to speed with the latest space missions.  He literally inspired generations and for that we should be forever grateful.

Sir Isaac Newton was of course long passed before Patrick was even born but when he said "If I have seen farther, it is because I stood on the shoulders of giants", he must have been invisaging a man such as Patrick.  For Patrick was just that.  One of the very few true giants of astronomy, who will be sorely missed.


On one of our visits to his home in Selsey in 2008, we made a short documentary.  A kind of behind the scen's look at "The Sky at Night" and a tribute to the great man himself.

Rest in Peace Patrick from your friends in Ireland.

Click here to watch the video tribute.

Last Updated on Sunday, 16 December 2012 21:51
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