Stargazing Nights

Stargazing Nights

Where:
Frosty Drew Observatory
When:
Friday January 20, 2017 7:00 p.m. - 9:00 p.m.
Cost:
$1 Suggested Donation per Person

Tonight is Stargazing Night at Frosty Drew Observatory and the forecast is looking quite disappointing. We can expect overcast conditions, with rain moving in around 8:00 p.m., followed by fog rolling in around 10:00 p.m. This forecast will certainly keep our telescopes closed tonight. Sadly, this is happening as the Moon enters its waning crescent phase, which is a great time to get out and celebrate dark skies. Fortunately, the waning crescent Moon signals the start of the lunar cycle that is favorable for dark sky viewing. Being that the third quarter Moon occurred yesterday morning, we have a couple weeks of awesome viewing opportunities ahead. We just need clouds to stay away.

We will open the Observatory and Sky Theatre at 7:00 p.m. tonight. In the observatory, tours of our telescopes will be available. These are the nights when we have the lights on in the observatory, making all of our gear visible – a true techno-geeks haven. In the Sky Theatre we will show celestial objects photographed at Frosty Drew Observatory with a commentary and open discussion on general astronomy and science. We will stay open until 9:00 p.m. unless the skies offer us a chance to geek out.

Overall, tonight is certainly not the night to be out for views in a telescope. At Frosty Drew, we can see celestial objects that are billions of light years distant, though we cannot see through the clouds. If you’re interested in how our gear operates or want to chat with our astronomers about the latest and greatest in the cosmos, then tonight could be a good night for you to hang out. Note that we will monitor the sky and in the unlikely event that the skies clear (hey, this is New England) we will open a telescope and check out some space. Otherwise, tonight will be a night to skip. Let’s hope for better viewing conditions next Friday!

------------------
Weekly Happenings
Scott MacNeill

Have you noticed the two bright stars that have been rising around midnight for the past couple weeks? If you’ve been watching, you have certainly observed that the top star has been changing its position relative to the bottom star. That’s because the top star is not a star at all, but instead the planet Jupiter, which has been accompanying Spica, the brightest star in the constellation Virgo.

With each passing night, Jupiter has been rising earlier and earlier, with its rise time crossing into the night time sky (before midnight) this past Sunday, January 15th. The earlier rise times will make Jupiter easier to view for those who do not last into the early morning stargazing hours, with Jupiter eventually rising before sunset. Over the next month Jupiter will remain about 3.5° away from Spica in the night time sky as its movement from West to East, called pro-grade motion, appears to stop. In late February though, you will notice that Jupiter will begin to move away from Spica, back towards the west, this is called retrograde motion. These changes in Jupiter’s apparent motion across the sky are a product of Earth’s faster orbit around the Sun than Jupiter.

Jupiter takes 11.86 Earth-years to complete one full orbit around the Sun, which means that Earth will complete nearly 12 orbits for every one that Jupiter makes. Every year as Earth orbits passed Jupiter on the same side of the Sun, background stars beyond Jupiter will appear to progress across the night sky faster than Jupiter, this effect is called parallax and will make Jupiter appear to move backwards in the sky. Once Earth arrives, in our orbit around the Sun, on the opposite side of the Sun than Jupiter, Jupiter will resume its forward motion across the sky. This will cause Jupiter to arrive close to Spica again in late August, and early September just after sunset.

Jupiter is a fabulous target for binoculars and telescopes of all sizes with different features becoming visible depending on your devices aperture. Binoculars and small telescopes will easily showcase the four Galilean Moon’s of Jupiter, whose positions will change on an daily basis, some on an hourly basis. Small backyard telescopes will easily show Jupiter’s equatorial bands with more than a hint of the Great Red Spot. Higher aperture backyard telescopes will easily see the Great Red Spot, shadow transits; which occur when the Galilean Moons create solar eclipses on Jupiter, and other smaller storms in Jupiter’s turbulent atmosphere. Add in that Jupiter will be close to Spica, a blue star for much of the winter, we will get a nice contrast of Jupiter’s rather yellowish color against Spica’s sapphire blue.

Spend some time over the next few months with Jupiter. The views are fantastic and the opportunities to catch the Great Red Spot, shadow transits, and changing configurations of the Galilean Moons are numerous and make Jupiter a unique target for observation. If you do not have a telescope or binoculars, be sure to catch Jupiter when it’s close to Spica and see if you can notice the difference in color. Jupiter is regular showcased in the Frosty Drew telescope on Friday nights and our viewing season for Jupiter begins in the next couple weeks. Do it!

Get rise times for Jupiter applicable to Southern New England and largely the U.S. East Coast

Check out some of the photos we have captured of Jupiter at Frosty Drew Observatory.

Geek out with scientific data on Jupiter.

-Scott