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Home Astronomy

See Saturn as opposition this weekend – Astronomy Now

August 23, 2023
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See Saturn as opposition this weekend – Astronomy Now
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Saturn imaged a number of nights previous, on 17 August. Picture: Eric Sussenbach.

The magnificent ringed planet Saturn is arguably the preferred planet, however undoubtably it’s essentially the most gorgeous of all by way of the eyepiece. Saturn is particular for its unbelievable system of rings which can be straightforward to see by way of even a small telescope. Sadly, the rings are ‘closing up’ from our perspective, on their strategy to an edge-on presentation in 2025. Regardless of this, the rings retain loads of their glory and are effectively seen (see beneath).

On Sunday, 27 August Saturn reaches it best possible for the 12 months, when it lies reverse the Solar within the sky, with Earth lined up between. This alignment is what astronomers time period ‘opposition’, and its when Saturn, or certainly any superior planet (these which orbit the Solar at a better distance than that of the Earth) provide optimum visibility. 

Saturn’s year-on-year altitude within the northern sky is on an upwards curve since a nadir for UK observers at its oppositions of 2018 and 2019, when in Saturn languished in Sagittarius. Nonetheless, Saturn stays situated south of the celestial equator (Saturn doesn’t cross into the northern sky till 2026) its declination of 20.6° south inserting it among the many stars of Aquarius. 

Saturn shines at magnitude +0.4, an opposition brightness that’s at the least almost half a magnitude fainter than when the rings are totally ‘open’. Nevertheless, Saturn dominates this a part of the sky with its brightness and, along with its signature yellowish, or creamy hue, it’s unmistakable.

At opposition on 27 August, Saturn rises at 8pm BST and culminates shortly after 1am at an elevation of round 28° from the south of England. It may be noticed at an altitude increased than 20° from about 10.40pm to three.30am. From Scotland, Saturn culminates almost 23° excessive at 1.18am BST.

Saturn and its household of brighter moons on opposition night time 27/28 August. Titan lies to the east of Saturn, near its most elongation from the gasoline big. AN graphics by Greg Smye-Rumsby.

Saturn’s gorgeous rings

The rings are tilted by 9°, although owing to altering viewing circumstances the rings regular year-on-year closure was arrested in June (7.2°). Since they’ve really been opening out once more and can attain a most tilt of 10.4° in early November, after which they start to shut up as soon as extra.  

Over intervals of 13.75 and 15.75 years, alternately, the Earth passes by way of the aircraft of the rings and at such instances when the rings are seen from Earth, they’re offered very near or exactly edge-on to our line of sight. The final time a so-called ring aircraft crossing occurred was in 2009, and the subsequent happens in March 2025. The rings have been final totally open (tilted by round 26 to 27 levels in direction of us) not in 2017. 

From Earth, three distinct, main rings may be seen encircling Saturn’s equator. The outer ring, Ring A, is split about 20 per cent of the best way in from its periphery by the elusive 325-kilometre-wide Encke Hole, or Division. The center ring, Ring B, is the broadest (width 25,500 km) and brightest ring and is separated from Ring A by the well-known 3,000-kilometre-wide Cassini Division. 

Inside Ring B is the dusky and really faint Ring C, or Crêpe Ring. The rings are composed overwhelmingly of water-ice with some rocky content material, the person particles starting from micron- to metre-size.

A small- to medium- sized telescope within the 80–150mm (3- to 6-inch) class will present Ring A and Ring B, although you’ll in all probability want a 250mm (ten-inch) telescope to see the Cassini Division.

After Saturn’s ring aircraft crossing in March 2025, the planet’s south pole is tilted in direction of us. At opposition on 21 September 2025 (left), the rings southern face are tilted by simply 1.8°. Nevertheless a wholesome angle of 17.8° is established by the point of Saturn’s opposition on 30 October 2028. Saturn’s rings will not be ‘large open’ once more till 2031-2032.

Monitor down Titan, Saturn’s big Moon

The large moon Titan is by far Saturn’s dominant satellite tv for pc and one of many very particular objects within the Photo voltaic System, memorably visited in 2004 by the Huygens probe launched from the Cassini spacecraft. It is just two per cent smaller than Jupiter’s big, Ganymede, its 5,150 kilometre (3,200 miles) diameter making it bigger than the planet Mercury and 50 per cent bigger than our Moon.

Titan orbits Saturn as soon as each 15.94 days in a tidally locked synchronous rotation. It shines at magnitude +8.4, vivid sufficient to be seen by way of steadily-held or mounted 10 x 50 binoculars when Saturn is extra favourably positioned. At this opposition although, a small telescope may be a greater wager to find it near its most japanese elongation from Saturn, some 3 arcminutes. It’s giant sufficient to indicate a diminutive disc by way of very giant telescopes, subtending an angle of 0.8 arcseconds.

Delicate banding on Saturn’s globe

Like Jupiter, Saturn shows darkish belts and brighter zones. Nevertheless, it lies twice as far-off from the Solar as its fellow gasoline big and receives a lot much less vitality to enliven its ambiance, leading to a way more refined impact. 

As we speak’s startlingly good novice photographs reveal their true extent, however all that’s more likely to be on at present on present visually is a brighter equatorial belt, an equatorial belt and a maybe a darkish polar hood. 

Sometimes storms are seen on Saturn, memorably in 2011, proven right here in dramatic element on this south up picture. Picture: Damian Peach.



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