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Displaying items by tag: Meteorite

A fireball seen shooting through the skies above parts of Ireland on Wednesday evening has been captured on Dublin Bay webcam, passing over Dublin Bay and Dun Laoghaire Harbour. 

The fireball was a meteor, experts have said. The observed portion of the trajectory covered over 300 km.

It appeared high in the sky at Dun Laoghaire for just a few seconds. before 10 pm and appeared to plunge seawards in flashes of light green colours to observers on the south Dublin Bay shoreline. 

The UK Meteor Network said it had received almost 800 reports after the blazing orb that was spotted in the night sky over Ireland, Northern Ireland and Scotland on Wednesday evening.

Watch the asteroid particle appear top left of frame in the youtube vid below and move right to left as it passes by Dun Laoghaire Harbour.

The UK scientists said the object, which lasted more than 20 seconds, was "definitely a meteor", adding "we are now 100% confident this was a small part of an asteroid".

The network said the end of the meteor's journey was not observed on camera, but that it ended over the north Atlantic Ocean, some 50-100km west of the Isle of Islay, the southern-most island of the Inner Hebrides.

An updated tweet from the organisation read: "It (the meteor) came on an asteroidal orbit and entered the atmosphere at 14.2 km/s.

"The observed portion of the trajectory covered over 300 km.

"If any meteorites did fall, they ended up in the ocean."

The Star keelboat is a 6.9 metres (23 ft) one-design racing keelboat for two people designed by Francis Sweisguth in 1910.

The Star was an Olympic keelboat class from 1932 through to 2012, the last year keelboats appeared at the Summer Olympics at which Ireland's representatives were Peter O'Leary and David Burrows.

Ireland has performed well in the class internationally thanks to some Olympic campaigns including a bronze medal at the Star World Championships in 2000, won by Mark Mansfield and David O'Brien.

The boat is sloop-rigged, with a mainsail larger in proportional size than any other boat of its length. Unlike most modern racing boats, it does not use a spinnaker when sailing downwind. Instead, when running downwind a whisker pole is used to hold the jib out to windward for correct wind flow.

Early Stars were built from wood, but modern boats are of fibreglass and carbon construction.

The boat must weigh at least 671 kg (1,479 lb) with a maximum total sail area of 26.5 m2 (285 sq ft).

The Star class pioneered an unusual circular boom vang track, which allows the vang to effectively hold the boom down even when the boom is turned far outboard on a downwind run.

Another notable aspect of Star sailing is the extreme hiking position adopted by the crew and at times the helmsman, who normally use a harness to help hang low off the windward side of the boat with only their lower legs inside.

At A Glance – Star Specifications

Designer Francis Sweisguth
Year 1910
Crew 2 (Skipper + Crew)
S + 1.5 C ≤ 250 kg (550 lb)[1]
Draft 1.016 m (3 ft 4 in)
Hull Type keelboat
Hull weight ≥ 671 kg (1,479 lb)
(including keel)
LOA 6.922 m (22 ft 9 in)
LWL 4.724 m (15 ft 6 in)
Beam 1.734 m (5 ft 8 in) at deck
1.372 m (4 ft 6 in) at chine
Hull appendages
Keel/board type bulb keel
401.5 ± 7 kg (885 ± 15 lb)
Rig
Rig type sloop
Mast length 9.652 m (31 ft 8 in)
Sails
Mainsail area 20.5 m2 (221 sq ft)
Jib/genoa area  6.0 m2 (65 sq ft)
Upwind sail area ≤ 26.5 m2 (285 sq ft)

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