{"id":63907,"date":"2024-09-23T10:51:42","date_gmt":"2024-09-23T10:51:42","guid":{"rendered":"http:\/\/4170e966-ec7b-4b75-8c15-419a16e5eace"},"modified":"2024-09-23T11:39:42","modified_gmt":"2024-09-23T11:39:42","slug":"how-to-observe-saturns-moons","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/how-to-observe-saturns-moons\/","title":{"rendered":"How to observe Saturn’s moons"},"content":{"rendered":"

Which of Saturn’s moons are brightest, and what sort of telescope do you need to see them? Find out in our observing guide. <\/p>

By Pete Lawrence\n <\/p>

Published: Monday, 23 September 2024 at 10:51 AM<\/p>

\n\n

Saturn has 146 known moons, but only 7 are visible, and it is possible to observe them through a telescope.<\/p>

Saturn is the Solar System planet with the most moons<\/a>. Due to its sheer size, the easiest of Saturn\u2019s satellites to see is Titan.<\/p>

This moon has a diameter of 5,150km, which makes it bigger than the planet Mercury.<\/p>

In the moon rankings, it\u2019s the second largest in the Solar System, only beaten by Jupiter<\/a>\u2019s Ganymede. It\u2019s also the only moon with a substantial atmosphere.<\/p>

Saturn and its moons, captured by Sreesha Belakvaadi, Bangalore, India, 1 May 2021Equipment: ZWO ASI290MC colour camera, Celestron 9.25\u201d SCT, iOptron CEM40 mount<\/figcaption><\/figure>
When you\u2019re gazing at it through your scope, you\u2019re not actually looking at Titan\u2019s surface but at its nitrogen-rich cloud tops.<\/p>
In terms of brightness, Titan can reach mag. +8.4 (find out what this means in our guide to star magnitude<\/a>), putting it well within the reach of binoculars<\/a>, while with a small telescope you\u2019ll have no trouble seeing it.<\/p>
The remaining 6 visible moons are all within the grasp of a 6-inch scope. If you need help finding them from your location, use an astronomy app<\/a> or free software like WinJUPOS<\/a> or Stellarium<\/a>.<\/p>
$\"Enceladus:$
Enceladus: Saturn’s icy moon. Credit: NASA\/JPL-Caltech\/Space Science Institute<\/figcaption><\/figure>
Saturn’s moons’ brightness<\/strong><\/h2>
Titan is Saturn’s brightest Moon. The planet’s brightest in order are:<\/p>
**Titan:<\/strong> mag. +8.4<\/li>**
**Rhea:<\/strong> mag. +9.7<\/li>**
**Tethys:<\/strong> mag. +10.3<\/li>**
**Dione:<\/strong> mag. +10.4<\/li>**
**Enceladus:<\/strong> mag. +11.8<\/li>**
**Iapetus:<\/strong> mag. +11.9<\/li><\/ul>**The unusual nature of Iapetus<\/a> quickly became apparent to its discoverer in 1671, the Italian astronomer Giovanni Cassini.<\/p>
He first saw the moon on the western side of Saturn but found it missing on a later search, when it should have been on the eastern side.<\/p>
It wasn\u2019t until 34 years later, when telescopes had improved, that Cassini finally saw Iapetus to the east, because when it\u2019s here it\u2019s almost two magnitudes fainter.<\/p>
$\"At$
At mag. 12.9, perfect viewing conditions will be required to spot Saturn’s moon Mimas.Credit: NASA\/JPL-Caltech<\/figcaption><\/figure>
This is why it had been impossible to see it before. Cassini deduced, correctly, that this was because the moon has one very bright hemisphere and one very dark one, and is also tidally locked to Saturn.<\/p>
This means, like our Moon, it always shows the same face to its planet<\/a>.<\/p>
It follows that we see a different part of Iapetus from our Earthly viewpoint when it is to the east or west of Saturn.<\/p>
As a result, Iapetus varies between mag. +10.1 and mag. +11.9.<\/p>
However, the faintness trophy goes to Mimas, which at mag. +12.9, needs perfect viewing conditions without any light pollution to see comfortably.<\/p>
**Saturn’s best moons to observe<\/strong><\/h2>**
**Titan<\/strong><\/h3>**
$\"Saturn's$
Credit: NASA\/JPL-Caltech\/Space Science Institute<\/figcaption><\/figure>
**Diameter:<\/strong> 5,152km<\/p>**
The largest of Saturn\u2019s moons has a 16-day orbit. At its farthest, you\u2019ll find it about five of Saturn\u2019s ring diameters from the planet, mag. +8.4 at its brightest, which makes it visible in good binoculars.<\/p>
**Titan makes up over 96% of the mass of everything orbiting the planet.<\/p>**
**Rhea<\/strong><\/h3>**
$\"Saturn's$
Credit: NASA\/JPL\/Space Science Institute<\/figcaption><\/figure>
**Diameter:<\/strong> 1,528km<\/p>**
The second largest moon of Saturn, ninth largest in the Solar System, and currently the 20th catalogued in distance out from the planet. It makes an orbit in 4.5 days, reaching just under two ring diameters from Saturn. It is mag. +9.7, making Rhea an easy target for a 3-inch refractor telescope.<\/p>
**Iapetus<\/strong><\/h3>**
$\"Saturn's$
Credit: NASA\/JPL\/Space Science Institute<\/figcaption><\/figure>
**Diameter:<\/strong> 1,469km<\/p>**
This is the third largest and most distant of the main moons of Saturn. Its 79-day orbit, which is the most inclined of the inner satellites, takes it out to 12 ring diameters from the planet. The visual magnitude ranges from +10.1 to +11.9, so Iapetus needs about a 6-inch scope tosee it at its darkest.<\/p>
Dione<\/strong><\/h3>
$\"Saturn's$
Credit: NASA\/JPL\/Space Science Institute<\/figcaption><\/figure>
**Diameter:<\/strong> 1,123km<\/p>**
This moon orbits up to 1.5 ring diameters from Saturn over 2.7 days. Its visual magnitude of +10.4 makes it visible on dark nights with a 3-inch refractor. This is the densest of the moons, meaning it may have a large rocky core. Helene and Polydeuces, two smaller moons, share its orbit.<\/p>
Tethys<\/strong><\/h3>
$\"Credit:$ <\/figure>
**Diameter:<\/strong> 1,060km<\/p>**
This moon orbits about one ring diameter away from the planet and takes 1.9 days to do so. It has a magnitude of +10.3 and so can be seen in a 3-inch refractor. Tethys has a great canyon that stretches three- quarters of the way round the moon, and two co-orbital moons, Telestoand Calypso.<\/p>
***Do you observe or photograph Saturn and its moons? Share your adventures and images with us by emailing contactus@skyatnightmagazine.com<\/a><\/em><\/strong><\/p> <\/body><\/html>\n***
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Saturn’s moons’ brightness<\/strong><\/h2>Titan is Saturn’s brightest Moon. The planet’s brightest in order are:<\/p>Titan:<\/strong> mag. +8.4<\/li>Rhea:<\/strong> mag. +9.7<\/li>Tethys:<\/strong> mag. +10.3<\/li>Dione:<\/strong> mag. +10.4<\/li>Enceladus:<\/strong> mag. +11.8<\/li>