All posts by dhuestis@brown.edu

David A. Huestis has been actively involved in the field of observational astronomy for more than 40 years in Rhode Island. He is a former President of Skyscrapers, Inc., the second oldest continuously operating amateur astronomical society in the United States. He has held that position three times over this period and is now the society’s Historian. David also holds a position at Brown University’s Ladd Observatory as Astronomy Assistant. For a decade ending in 1995 he taught the “Telescopic Astronomy” course at the Boston Museum of Science, and in that same year, he completed his seventh year teaching the mini-course “How to Choose a Telescope” for the museum. David informs the local print and news media about astronomical events by writing a monthly general astronomy column. In December 2007, Huestis published a 180-page hardcover book titled 75 Years of Skyscrapers, highlighting the history of Skyscrapers. Drawing on his primary research, he wrote "Stardust Memories: Frank Evans Seagrave and Halley's Comet – 1910,” an article that appeared in the May 1986 issue of the Rhode Island History Journal, about the notable Providence astronomer who calculated Halley’s orbit with the greatest accuracy of his time. Besides writing, Huestis has published several of his aurora borealis photos. One appeared in the July 1978 issue of Sky and Telescope magazine. That same image was selected by Kelley Beatty, et al, for inclusion in The New Solar System book, the first (1981) and second (1982) editions. That exposure led him to have two aurora images and commentary appear in a sky phenomenon book titled, Sunsets, Twilights and Evening Skies by Aden and Majorie Meinel of Arizona in 1983. He has also freelanced as a book reviewer for the prestigious Sky and Telescope magazine in 1992 and 1993 on the topic of the northern lights. In addition, David has traveled widely to view total solar eclipses: Tennessee (2017), Hawaii (1991), Tanzania (1980), and Canada (1979). During February 2009, Dave received two recognition awards for his public outreach in astronomy. Brown University presented him with an Excellence Award for Citizenship as part of the Ladd Observatory Team. And, the NASA Night Sky Network, in conjunction with the International Year of Astronomy 2009 (IYA2009), presented Dave with a Certificate of Appreciation award for his contributions to public awareness of astronomy and space science as President Emeritus of Skyscrapers, Inc., The Amateur Astronomical Society of Rhode Island. On the night of September 27-28, 2015, Dave provided telescopes on the Bryant campus to view the total lunar eclipse. And on May 9, 2016, he set up telescopes with solar filters to safely view the transit of Mercury across the disk of the Sun.. Professor Huestis has been an astronomy lab instructor at Bryant since January, 2009.

A Minimal Penumbral Lunar Eclipse and Two “Meteorocre” Shooting Star Displays

“What’s in a name? That which we call a July Full Moon
By many other names would shine as bright.”

My apologies to William Shakespeare, but I simply couldn’t resist mangling the above famous quote from Romeo and Juliet.

Full Moons have a myriad of names. Here in the United States the colonists adopted many of them from Native Americans, predominantly the eastern Algonquin nation. While these descriptive names have become the primary ones by which we identify each Full Moon, many other names have been ascribed to them.

For example, the July Full Moon is usually called the Full Buck Moon. This name was one brought over by the colonists from Europe. Male deer in both Europe and North and South America shed their antlers yearly, and by July a new set has emerged. Another old-world name for this Full Moon is Hay Moon, signaling when the hay field had been reaped. And finally Thunder Moon has been used for obvious reasons during northern hemisphere summer months.

Continue reading A Minimal Penumbral Lunar Eclipse and Two “Meteorocre” Shooting Star Displays

Supernova deferred (for now), Easter, and a meteor shower

As 2019 came to a close, the news media sensationalized a story about Orion’s bright star Betelgeuse. The headlines were certainly designed to get one’s attention. Betelgeuse was about to go supernova. However, the star’s behavior was really old news that was recently enhanced by new observational data. You see, Betelgeuse is a red super giant star (20 times more massive than our Sun and approximately 1000 times larger) that is indeed nearing the end of its life cycle. And with a star this massive, the result will someday be a supernova event.

Betelgeuse is a known variable star, which pulsates back and forth about one full magnitude (brightness scale) in a 425-day period. What happened more recently is that the star dimmed a little more than usual, by about .2 of a magnitude. An imaging technique using radio waves revealed Betelgeuse appeared to be lopsided, but this discovery turned out to be a huge dust cloud blocking some of the star’s light from reaching us. In fact, Betelgeuse has shed off great shells of its outer surface several times in the past, typical activity for these stars as they “burn” through their supply of nuclear fuel. Speculation arose that Betelgeuse’s grand finale was soon at hand.

However, every article I read succinctly stated the event could happen soon, or 100,000 years from now. While it is inevitable that Betelgeuse will go supernova in the future, we needn’t worry. Fortunately, at its distance of about 700 light years from the Earth, we will not suffer from any hard radiation effects. The supernova will be at least as bright as a Full Moon and will be visible in broad daylight. About a day before we see the visible light from the supernova event our Earth will be bombarded by a harmless hail of neutrinos and gamma rays. That onslaught will be our advance warning system that Betelgeuse the star has met its demise.

Continue reading Supernova deferred (for now), Easter, and a meteor shower

Pluto at Ninety: Discovered, Demoted, Visited

A little more than ninety years ago, in a barred spiral galaxy named the Milky Way, a stellar system named Sol had a retinue of eight known planets revolving around it. The last one to be discovered was Neptune in September 1846. However, as time passed small perturbations in Neptune’s orbit were noted, which suggested another “trans-Neptunian object” existed whose presence altered his path around our Sun. It wasn’t until 1905 that a wealthy Boston astronomer, Percival Lowell, started a search for “Planet X” using his Flagstaff, Arizona, observatory. Lowell, with his mathematics background, and with the help of colleagues, tried to derive a possible orbit for a potential unknown planet. They even took photographic plates in 1906 of an area of sky where they thought planet “X” might be located, but with no results.

Unfortunately, Percival Lowell died at age 61 on November 12, 1916 and the search for the elusive “Planet X” ended. However, in 1929, the search for Pluto was resumed at the Lowell Observatory using calculations that Lowell had computed earlier. A 23 year-old Clyde W. Tombaugh was hired to meticulously image specific areas of the sky using photographic glass plates. The same star field would be exposed several days apart. Once the plates were developed, they were placed in a viewing machine called a blink comparator that held two plates. The operator could switch back and forth from one plate to the other. This process was called “blinking.”

Continue reading Pluto at Ninety: Discovered, Demoted, Visited

Observing the Inner Solar System: Mercury and Venus

When guests visit the local observatories, staff astronomers always look to impress them with great views of the Moon, Jupiter, Saturn and Mars when any of these worlds are observable. The wealth of detail visible through each facility’s telescopes can awaken the sense of awe within children and adults alike. What child hasn’t marveled at the Moon’s vast craters? Who hasn’t watched the parade of Jupiter’s Galilean moons orbiting this gigantic planet and not thought about Galileo’s first view of this phenomenal sight? We sky interpreters love to hear the oohs and aahs as folks get a glimpse of Saturn’s magnificent rings for the first time. And when dust storms on Mars don’t spoil the view of this desert-like world, who can’t help but wonder if life may exist beneath its surface? Any night amateur astronomers can introduce casual stargazers to these magnificent worlds is a wonderful experience.

However, while the afore-mentioned objects get most of the glory, there are two inferior planets of our solar system that are often neglected. No, they do not have any neuroses. Inferior is an astronomical term meaning these planets orbit between the Sun and the Earth. I’m referring to Mercury and Venus. Consequently, they do not stray far from the Sun in the sky from our Earthly perspective. Examine this brief video which explains what we observe. Whenever Mercury and Venus appear above either the eastern or western horizon these events are called elongations. Mercury can appear no more than a maximum of 28 degrees away from the Sun, while Venus can appear no more than a maximum of 48 degrees away from the Sun. Elevation above one’s horizon varies from one elongation to another.

Continue reading Observing the Inner Solar System: Mercury and Venus

Astronomical Highlights for 2020

Happy New Year everyone. Yet another year has passed into the history books, and I am once again presenting some of the astronomical highlights upcoming in 2020. While there are a couple of impressive upcoming events, any time the skies are clear and transparent many stargazers are enticed out under the vault of the heavens to explore our beautiful universe.

The winter months around Southern New England can be quite cold, and I for one need some incentive to spend much time outdoors observing the sky. Fortunately, the sky gods provide the Quadrantid meteor shower which peaks on the night of January 3-4. While this shooting star display can produce up to 100 meteors per hour during peak, a more modest 60 meteors per hour is likely under a moon-less sky. This shower also sports a very narrow peak of activity, only several hours in duration, that can easily be missed. However, if you have the time and can tolerate the usual cold temperatures, the Quadrantids don’t disappoint the well-prepared observer.

Continue reading Astronomical Highlights for 2020