Grianan Fort

10 years 10 months ago #79706 by Sophro
Grianan Fort was created by Sophro
I've often thought to myself that Grianan Fort, located in Donegal (15 minutes from Derry) would be an ideal spot for observing. Located 244 metres above sea level, it is a ring fort dating from 800BC or there abouts. For some more info and images you can see it here unknownswilly.orgfree.com/grianan.html .

The problem is that it is unfortunetly shut each evening and entry is forbidden there after. It would be an excellent location for a star party. I think contacting the local council may be in order to enquire...

Please Log in or Create an account to join the conversation.

10 years 10 months ago #79893 by Euronymous
Replied by Euronymous on topic Re:Grianan Fort
I've thought about that too. But it's probably best for us to just head on out towards Buncrana for another 10 minutes and go to the carpark in lisfanon or somewhere like that. I usually just observe from my garden in Derry but have thought about taking a trip out that road or else the Letterkenny road. Observed a couple of times from Buncrana itself and it was so much clearer than from Derry. I reckon the ultimate night would be up the Glenshane, high up with extremely dark nights

Celestron C8-N (200mm reflector)
Carl Zeiss 10x50's
-Amateur Astronomer, photographer, guitarist, and beer drinker-

Please Log in or Create an account to join the conversation.

10 years 10 months ago #79899 by Sophro
Replied by Sophro on topic Re:Grianan Fort
The light pollution from Derry would be a problem, but I would still fancy it. I'm thinking about some gate hopping soon!

Fahan would be a decent spot, although I would prefer somewhere more elevated. I think for a perfect observing night the area in and around Ballyliffin would be ideal. There is limited light pollution and plenty of highly elevated areas.

I just bought a new 5 inch Sky Watcher and I'm hoping to go down around that area in the next few weeks. Have you been been observing long? I haven't heard of any groups around the Derry area, have you?

Please Log in or Create an account to join the conversation.

10 years 10 months ago - 10 years 10 months ago #79900 by Euronymous
Replied by Euronymous on topic Re:Grianan Fort
There's a place out in the Bluestacks in Donegal that I'm thinking of camping at soon, as it is good for climbing (my other hobby), and I might bring my scope along as well, if it fits!
I got my 8 inch telescope two years ago, so that's pretty much how long I have been observing deep sky objects (in reality, not many nights out due to the poor weather). Have a nice pair of 10x50 binoculars that I've used since I was a child, good for picking out star clusters and brighter objects.
I don't think there's an astronomy club in Derry. I know St. Columb's College had an after school club that I went to a couple of times, but not many people went and I think it sort of fizzled out. They had a nice telescope though.
Ballyliffen sounds like a good spot, might check it out some time. I'm camping in Gweedore later in August too, might be good for binoculars.

Celestron C8-N (200mm reflector)
Carl Zeiss 10x50's
-Amateur Astronomer, photographer, guitarist, and beer drinker-

Please Log in or Create an account to join the conversation.

10 years 10 months ago #79901 by Sophro
Replied by Sophro on topic Re:Grianan Fort
Bluestacks sounds like another good spot! I've literally only been out one night with my telescope because I be up at 5 every morning for work (only got it on Monday).

I hear what you’re saying about the poor weather, although Monday night had excellent seeing conditions. I got a good look at Jupiter and it's moons then scanned the area in and around the summer triangle.

I live about 5 minutes outside of Killea so light pollution in my area is pretty minimal. The main source of light pollution (Derry) is covered by trees so it doesn't affect the seeing so much.

I wouldn't mind meeting up with some like-minded people in the area if we could get a night organised. Although I'm not sure if there's many around! I have one friend who's also interested in astronomy but that’s as far as my connections go!

Please Log in or Create an account to join the conversation.

10 years 10 months ago #79903 by jeyjey
Replied by jeyjey on topic Re:Grianan Fort
Hey guys, I hope you find some good sites up your way.

I just thought I'd help out a bit with some of the lingo. "Seeing" usually refers to the stability (or lack thereof) of the atmosphere. It controls how much fine detail is smeared in an image, and is mainly an issue when viewing the planets, the sun or moon, or while trying to split tight double stars. Targets such as galaxies and nebulae don't have much fine detail, and so are less bothered by the seeing.

"Transparency" refers to the amount of particulate matter in the atmosphere, and how much light is bouncing off of it. (The light is usually light pollution, but can also be from natural sources.) Transparency mainly affects dimmer targest such as galaxies, nebulae, globular clusters, etc.

Seeing is often measured on a subjective scale from 1 to 5, based on the observer's experiences. However, that's not very objective, and so one observer's 3 doesn't necessarily line up with another's. A more objective method is the Pickering seeing scale, which is best described (and illustrated) here:

uk.geocities.com/dpeach_78/pickering.htm

Finally, some astro-photographers measure seeing by measuring how much the bright center (known as the FWHM, or full-width half-maximum) of a star's image moves. But you pretty much need a CCD and a computer for this method, and some astro-photographers still prefer the Pickering seeing scale.

Transparency is most commonly measured by naked-eye limiting magnitude (NELM), which is simply the dimmest star you can see. Since peoples' eyesight varies, this is also somewhat subjective, although probably less so than seeing. An objective method uses a gadget known as the Sky Quality Meter, which measures magnitudes per square arc-second or something like that, but is commonly just called the "SQM" reading.

I'd better stop now before I bore you all to tears....

Cheers,
-- Jeff.

Nikon 18x70s / UA Millennium                              Colorado:
Solarscope SF70 / TV Pronto / AP400QMD             Coronado SolarMax40 DS / Bogen 055+3130
APM MC1610 / Tak FC-125 / AP1200GTO               Tak Mewlon 250 / AP600EGTO

Please Log in or Create an account to join the conversation.

6 years 6 months ago #99415 by adamroryporter
Replied by adamroryporter on topic Re:Grianan Fort
The monument known as Grianan of Aileach is a great spot when it's clear. When the gate is closed at the bottom it's still ok to walk up. Light pollution is indeed quite intense from Derry and the surrounding villages, but on a very clear night, the pollution can be quite well controlled in Adobe Camera Raw.

Here's a photo I've attached from August 2013 when some of us from Buncrana Camera Club went up. Justin MacLochlainn did the torchwork, it was a beautiful night! Nikon D600, Samyang 14mm, f3.2, iso800, 20 second exposure.

Inishowen is indeed a great spot on a clear night. Lisfannon and Luddan Beaches in Buncrana are good locations, but the further out you go the better, Dunree Fort is fabulous, The Gap of Mamore / Mamore Gap is amazingly dark and Leenan and Urris are wonderful to.

I don understand this post was over 4 years ago and that this is my first post, hope yous don't mine :)
Attachments:

Please Log in or Create an account to join the conversation.

Time to create page: 0.082 seconds
Powered by Kunena Forum