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Not really why, especially since I think Pluto should retain its Pluto is no longer considered to be a real planet. Neptune is the last planet that I will cover in this article, since Their respective planets is shown in Figure 5. A visual comparison of the moons’Īctual size versus the apparent size in the sky as viewed from Larger moons at about 84% of the diameter (71% of the area) of Neptune’s largest moon, Triton, would also appear as one of the Their respective planets is shown in Figure 4. Size versus the apparent size in the sky as viewed from Less than 1/3 of the diameter (11% of the area) of our moon Would appear as the smallest in the Uranian sky at a little Oberon is the largest moon of Uranus, but it Sky at 40% of the diameter (16% of the area) of our moon Titania would appear the same diameter in the Uranian The diameter (1/4 of the area) of our moon. The area) of our moon in our sky, then Umbriel at 1/2 of The largest would be Ariel at 2/3 of the diameter (44% of Size in the Uranian sky than the other planets’ moons. The moons of Uranus seem to appear closer together in Of the moons’ actual size versus the apparent Phoebe at less than 4 arc seconds, would be Respectively, would be fairly bright, while Next is Tethys,ĭione and Rhea both appear about 1/3 of theĪbout 1/4 of the diameter (6% of the area) of Slightly less than half the diameter (1/4 of theĪrea) of our moon in our sky. To appear the largest in the Saturnian sky at Titan is Saturn’s largest moon, and also happens Saturn is the planet with the greatest number of significant moons, whichĪlso have the greatest variation of apparent Moons’ actual size versus the apparent size in the skyĪs viewed from their respective planets is shown in Would appear about 1/4 of the diameter (6% of theĪrea) as our moon. Of the diameter (1/4 of the area) of our moon, and Callisto Slightly smaller than our moon appears in our sky.Įuropa and Ganymede would each appear about half Largest moon in the Jovian sky, which would be I figured that they must be massive in the Jovian sky. They can easily be seen with a good pair of binoculars, Since the Galilean moons of Jupiter are so large that In the sky as viewed from their respective planets is Of the moons’ actual size versus the apparent size Merely look like a bright star, about twice the diameter Of the area) in the Martian sky as our moon appears Phobos would appear about 1/4 of the diameter (6% Like from the Martian surface? At 7.4 arc minutes, To be seen from Earth, at least with any equipment I Mars are both too small, and too close to the planet Many years ago, I realized that the moons of Moons of Jupiter with a good pair of binoculars,Īnd they’re much further away from us than the After all, we can easily see the Galilean We can’t see the moons of our closest neighboring When I was a teenager, I also had wondered why In the night sky at its largest (full phase). (2,160 mi) and an average distance from us ofģ84,400 km (238,850 mi), it spans 31.1 arc minutes, or just over 1/2° Therefore, I included both comparisons for each “size” to mean diameter, while others wouldĬonsider it to mean area. I then realized that some who may read this would consider In my first draft of this article, I had compared the apparent size ofĪ given moon to that of our own, without really defining Of my high school trigonometry should give me an I thought, “This information, along with a bit In the sky or the smaller moons appear large? The moon tables usually also Or how they would compare to the apparent size of our moon in the Earth’s Sky as viewed from the respective planets they orbit, Tables don’t give any idea of how these moons would appear in the Ours is one of the larger moons in the solar

Showing the diameters of the various moons of our solar system, which giveĬompared to our own moon. Large and prominent as our own? I’ve seen tables Or Uranus! Can you imagine seeing so many prominent objects in the nightĭark, moonless nights for observing galaxies and nebulae are cursing meįor making such a statement, because it wouldīe a rare occasion indeed to have a moonless night on one of those planets. The night sky as it might be seen on Jupiter, Saturn, Many of the other planets in our solar system When I was a teenager, I often wondered why we have only one moon, while

Since I really took an interest in astronomy Throughout the month, especially once I understood why it did so. Ever since I was about ten years old, I liked observing the moon, and liked