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Home Astronomy

the return of summer time’s capturing star spectacular! – Astronomy Now

August 8, 2024
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the return of summer time’s capturing star spectacular! – Astronomy Now
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A Perseid meteor from 2015. Picture: Alan Robust.

The annual Perseid meteor bathe has been underway since final month and it predicted to achieve its ordinary eagerly-anticipated most early subsequent week, on 12 August between 13h and 16h UT. The Perseids is the 12 months’s hottest meteor bathe and one of many main highlights on the observing calendar, with many astronomical societies and eager people having made plans for journeys to watch this particular spectacle from a dark-sky website 

The Perseids are lively from 17 July to 24 August, with cameras of the UK Meteor Community having already recorded exercise. Specifically, a stunning Perseid fireball, estimated at magnitude –4.4, was only in the near past captured, on the night time of 1/2 August at 01:19 UT (see picture).

A Perseid fireball just lately captured, on 1/2 August, from the Orkney Islands. Picture: Callum Potter.

This 12 months’s peak means your greatest likelihood to bag most meteors is on the night time of 12/13 August (Monday night time into Tuesday morning), although noticed charges of meteors ought to nonetheless be good on the earlier night time, 11/12 August (Sunday night time into Monday morning), and on 13/14 August. The Moon, too usually it appears a blight by wiping out the probabilities of detecting fainter Perseids, will not be an enormous issue this 12 months. Its at waxing gibbous section and units at 11pm BST on 12 August. This leaves the sector clear for meteor watches main as much as daybreak because the radiant climbs ever greater within the east. 

Meteor showers have a peak known as the ‘Zenithal Hourly Fee’ (ZHR). For the Perseids, the worth is normally within the area of 100 (100–150 typically), although this hourly fee would solely be seen if the showers radiant lay excessive overhead, on the zenith, and observing circumstances have been excellent. In the true observing world, from a fairly good observing website when the radiant is excessive, hourly charges on common of round 40 meteors will not be unreasonable. Assuming a cloudless and haze-free sky at a dark-sky website observers can anticipate to see between 50 and 70 meteors every hour close to the height.

A Perseid fireball. Picture: Frank Hurrell.

The Perseid radiant lies within the far north of Perseus (see the graphic right here displaying you the place it’s positioned), mendacity low within the north-eastern sky as darkness falls however climbing to an honest altitude of fifty levels or so by 2am BST. By this time, the areas of the sky the place Perseids usually tend to seem will probably be significantly better positioned than previous to midnight. 

When on a meteor watch, don’t peer intently on the spot within the sky the place the radiant lies. Perseid meteor trails or streaks right here will seem quick and subsequently more durable to see. You will notice many extra capturing stars for those who observe an space of sky 30-40 levels from the radiant (from the place, meteor streaks could seem longer) and round 50 levels above the horizon.

Perseid meteors are the results of particles from periodic comet 109P/Swift–Tuttle, shed alongside its 133-year orbit. They’re swift, getting into the Earth’s higher ambiance at 60km/second. The bathe is famend for producing an abundance of vibrant meteors and fireballs that usually depart lingering trails or trails.

The Perseid radiant lies within the far north of Perseus. AN graphic by Greg Smye-Rumsby.



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