Jupiter and three of its largest moons

I've been using my telescope during January to watch Jupiter and to follow the orbital positions of its four largest moons--Io, Europa, Ganymede and Callisto. These four moons are called the Galilean moons because they were first discovered by Galileo Galilei around 1610. Io is the moon closest to Jupiter, while Callisto is the farthest from Jupiter. Regarding the length of the orbital periods for each moon, Io takes 1.769 days to orbit Jupiter, Europa 3.551 days, Ganymede 7.155 days, and Callisto 16.69 days. This makes it interesting to watch them, because it is possible to see the changes in their positions relative to Jupiter. I've been drawing their positions and at the same time trying to get a decent photo of them and of Jupiter with my digital SLR camera. Despite what I've read online, it's a tricky business to get a good photo, even when I follow the advice given. I plan on taking photos as often as I can; it's not each night that one can do that, due to clouds, fog, precipitation or other interferences that block the view. Some nights, I have been able to see all four moons, but not get a good photo. If I get a good photo of all four of them, I'll post the pic. Tonight I managed for the first time since I got my telescope to get a good photo of Jupiter and three of its moons. I'm posting the original photo and a cropped version to get a better view (a good suggestion from my husband). Enjoy.

The above image--cropped to get a closer view: Jupiter and three of its moons

A fascination with the night sky

I find myself looking skyward at night a lot this month; the reason is that this is a remarkable month for planet sightings according to the different astronomy websites I’ve come across. Check out the following website for good information about what’s happening in the sky above us during March http://earthsky.org/astronomy-essentials/visible-planets-tonight-mars-jupiter-venus-saturn-mercury. It helps that March has been a month of some wonderfully sunny clear days and equally clear crisp nights, so that when I look up I can in fact see the planets, stars and the moon, not hidden by clouds or fog.

I’ve never been very good at identifying the different stellar constellations, except for the Big and Little Dippers, the common names for Ursa Major and Ursa Minor if I understand the information I’ve read correctly. As a child, I remember looking up at the ceiling of Grand Central Station in New York City and being pleasantly surprised by what I saw there—a zodiac mural painted on the green ceiling, which has recently been restored. For more information about it, check out the following site: http://www.wnyc.org/articles/wnyc-news/2010/nov/08/stars-shine-grand-central-terminal-again/. My parents tried to explain some of this to us, but my siblings and I were not of an age where we could really understand it. But it was fun to look at.

I’ve been trying to photograph the night sky a lot this month, without much success until tonight. I am posting the photo I was happiest with. You can see the crescent moon, and closest to it on the left is Jupiter; Venus shines brightly above the both of them. Enjoy!