Moon and Milky Way

Milky Way and the Moon - the "Tea Pot" of Sagittarius and constellation Scorpius are visible on opposite sides of the central tree. The bright star above Moon is Arcturus.

The Cuyahoga Astronomical Association hosted a public star party the night of Saturday, July 29. While I did not take my telescope to the event, I was happy to have attended and brought my camera setup. I spoke with several people, answering questions about the night sky and pointing out a few areas of interest. I was also able to observe planet Mercury through one of the club's telescopes. The tiny world was in a crescent phase - the first time I've witnessed that (Mercury can be very difficult to observe due to its proximity to the Sun and obstructions along the local horizon.). Aside from viewing Jupiter and Saturn via others' telescopes, my main interest was trying out my camera and lens setup on the Milky Way.

Moon - July 29, 2017

Light from the waxing Crescent Moon and from the nearby city of Medina made the Milky Way's star lanes appear as misty clouds but they were more noticeable in photographs. I hope to return some time soon, on a moonless night, and make a few more efforts at local Milky Way photography before human-made light pollution makes it impossible.

A small meteor streaks through the wispy clouds of the Milky Way. July 29, 2017.

2016 Transit of Mercury

Mercury's Transit in Progress: Mercury is the tiny dot at the lower-left. Smudge near the center is a group of sunspots. Photo by James Guilford.

I've been quite remiss in keeping up this online journal. No excuses; I have simply neglected the work! This week, however, we were treated to a fairly rare space event though the weather interfered a bit!

May 9: Our Solar System doesn't care about our local weather. When something rare and interesting like today's transit of Mercury across the solar disk takes place, it happens and there are no "rain checks." And so it was this morning when the day dawned clear to partly-cloudy allowing us to glimpse the beginning of Mercury's trek only to have the show stopped by rapidly encroaching clouds progressing to solid overcast!

Transit of Mercury: Mother Earth's atmospherics begin to block the view! Photo by James Guilford.

At the predicted hour Mercury appeared as a tiny dot, silhouetted in the lower left-hand quadrant of the Sun's bright disk. Using protective filters, observers on the ground watched as the small dot slowly moved inward from Sol's limb. I used my trusty Canon DSLR camera paired with a 400mm telephoto lens to see and record Mercury's trek. During my brief photography session I occasionally used a 2X telephoto converter with the 400mm and swapped between an "orange" glass solar filter and a white light solar film filter.

NASA's GOES East spacecraft shows how much of the U.S. was blocked from seeing the 2016 Transit of Mercury.

Here in Northern Ohio, transit watchers were treated to the beginning of the show and could have seen its entirety but for the clouds; the transit started after dawn and ended in the afternoon. Much of the nation missed out entirely, however, with cloud cover already in place at dawn!

NASA's Solar Dynamics Observatory, a spacecraft, is unaffected by Earth's pesky atmospherics and its technology produces some very dramatic images. One of my favorites shows Mercury about to cross between the satellite (us) and the Sun's glowing photosphere; the planet has the active solar atmosphere as backdrop. Planet Mercury is 3,030 miles in diameter, not much bigger than Earth's Moon, and looked every bit as tiny as it is compared with our nearest star!

The View from Space. Credit: Data courtesy of NASA/SDO, HMI, and AIA science teams.

The transit of Mercury took place over several hours. For us in Northern Ohio, the transit began at about 7:12 AM Eastern Daylight Time with the Sun barely up. Midpoint of Mercury’s passage was at 10:57 AM, and the transit ended at 2:42 PM.

The orbits of the inner planets are tilted with respect to each other making difficult the perfect alignment needed for a transit.

Because of the orbital inclinations of the inner planets, the alignment needed to produce a transit of Mercury happens only about 13 times per century making even a glimpse of the event something special. After today's, the next transits of Mercury will take place in November 2019, November 2032, and November 2049.

At least we won't have to wait for so long as we must for the next transit of Venus -- that happens in December 2117.